Changes with njs 0.9.9                                       19 May 2026

    nginx modules:

    *) Security: a heap buffer overflow might occur in a worker process
       when the "js_fetch_proxy" directive value contains nginx
       variables derived from the client request ($http_*, $arg_*,
       $cookie_*, etc.) and the location's JS handler invokes
       ngx.fetch(). The issue was introduced in dea83189 (0.9.4).

    *) Feature: added js_access directive.

    *) Feature: added r.readRequestText(), r.readRequestArrayBuffer(),
       and r.readRequestJSON() - async methods that read the request
       body, available in js_access and js_content directives.

    *) Feature: added r.readRequestForm() - async method that parses
       the request body submitted from an HTML form
       (application/x-www-form-urlencoded and multipart/form-data) and
       returns a structured accessor object.  The method is available
       in js_access and js_content directives.

    *) Feature: added jsVarNames() method.  The method returns the
       names of variables declared with js_var.

    Core:

    *) Bugfix: fixed evaluation order of call arguments with side
       effects.  Previously, an earlier argument could observe a later
       argument's mutation, e.g. f(a, a = 2) passed 2 as both
       arguments.
       The issue was introduced in fd5e523f (0.9.7).

Changes with njs 0.9.8                                       23 Apr 2026

    nginx modules:

    *) Bugfix: fixed loading of the built-in "crypto" module.
       The issue was introduced in 3185ce81 (0.9.7).

Changes with njs 0.9.7                                       21 Apr 2026

    nginx modules:

    *) Feature: improved shared dict eviction strategy.

    *) Feature: added ttl() method to shared dictionaries.

    *) Bugfix: removed spurious "js vm init" notice log emitted during
       configuration parsing.

    *) Bugfix: removed shared dict expiration from read-locked paths.

    *) Bugfix: fixed double-free in shared dict update with eviction.

    *) Bugfix: fixed per-entry TTL reset on shared dict incr() calls.

    Core:

    *) Feature: added Ed25519 and X25519 support for WebCrypto.

    *) Feature: added wrapKey() and unwrapKey() support for WebCrypto.

    *) Feature: added crypto.randomUUID().

    *) Feature: allowed await expressions in tagged templates and as
       call arguments.

    *) Improvement: switched to OpenSSL EVP for hashing in the built-in
       "crypto" module.

    *) Bugfix: fixed call argument evaluation.

Changes with njs 0.9.6                                       03 Mar 2026

    nginx modules:

    *) Bugfix: fixed expire field truncation in shared dict state files.
       Millisecond timestamps were silently truncated to 10 digits,
       making restored entries appear expired on restart.
       The issue has been present since eca03622 (0.9.1).

    *) Bugfix: suppressed slab log_nomem for evict shared dict zones.
       When evict is enabled, memory allocation failures are expected
       and handled by evicting old entries.

    *) Bugfix: fixed stack trace for native fetch exceptions for QuickJS
       engine.

    Core:

    *) Feature: added optional chaining support.

    *) Feature: added nullish coalescing assignment operator (??=).

    *) Feature: added logical assignment operators (||= and &&=).

    *) Improvement: aligned SyntaxError reporting with other JS engines.
       Previously, file name was a part of the error message.  Now it is
       reported as "stack" property.

    *) Improvement: improved Error.stack traces.
       Stack traces are now attached in error constructors.  Performance
       of Error.stack is improved by ~100 times.

    *) Bugfix: fixed string offset map corruption in scope values hash.
       The issue caused SEGV/SIGBUS crashes for multi-byte UTF-8 string
       constants with more than 32 characters when accessing a character
       at index >= 32 (e.g. via .replace() or bracket notation).
       The issue was introduced in e7caa46d (0.9.5).

    *) Bugfix: fixed heap-buffer-overflow in atom hash caused by
       Symbol().

    *) Bugfix: fixed WebCrypto importKey() crash with mismatched JWK key
       type.

    *) Bugfix: fixed interactive mode detection for piped stdin.
       The issue was introduced in 4988565c (0.8.0).

    *) Bugfix: fixed build on MacOS.

    *) Bugfix: fixed PTR macro compatibility with newer BFD library.

    *) Bugfix: auto/cc: use portable 'command -v' instead of 'which'.
       Thanks to Zurab Kvachadze.

Changes with njs 0.9.5                                       13 Jan 2026

    nginx modules:

    *) Feature: added native module support for QuickJS engine.
       The following directives were added: js_load_http_native_module,
       js_load_stream_native_module.

    *) Bugfix: fixed js_body_filter with multiple chunks for QuickJS
       engine.

    *) Bugfix: fixed buffer_type inheritance in if blocks for js_body_filter.
       Previously, when js_body_filter was used inside an if block,
       the data parameter received Buffer type instead of the expected
       String type.

    *) Bugfix: fixed js_body_filter when data is not in memory.
       Previously, when upstream data was delivered from nginx cache,
       js_body_filter was not able to process it correctly.

    *) Bugfix: improved r.subrequest() error handling.
       Fixed a problem of a lost write event when the njs handler
       making r.subrequest() is called from a lua handler as a
       subrequest.

    Core:

    *) Bugfix: fixed XMLAttr object.
       Pointer to xmlAttr could become invalid when the parent XMLNode
       was modified.

    *) Bugfix: fixed XMLNode update.

    *) Bugfix: fixed ArrayBuffer with detached buffers.

    *) Bugfix: added missing detached array checks.

    *) Bugfix: fixed fs.mkdir() and friends.

    *) Bugfix: fixed path restoration in fs.mkdir() and friends on
       error.

    *) Bugfix: fixed missed allocation check in promise code.

Changes with njs 0.9.4                                       28 Oct 2025

    nginx modules:

    *) Feature: added HTTP forward proxy support for ngx.fetch() API.

    Core:

    *) Bugfix: fixed r.subrequest() to a location with JS handler
       for QuickJS. The bug became visible after
       bellard/quickjs@42eb2795.

Changes with njs 0.9.3                                       07 Oct 2025

    nginx modules:

    *) Bugfix: fixed heap-use-after-free while module loading.

    *) Bugfix: fixed heap-use-after-free in js_set handler used
       in log phase. The issue was introduced in 04f6dfb (0.9.2).

Changes with njs 0.9.2                                       23 Sep 2025

    nginx modules:

    *) Feature: added HTTP keepalive support for ngx.fetch() API.

    *) Improvement: added configure time check when js_import is
       not defined.

    *) Bugfix: fixed merging of js_path directives.

    *) Bugfix: fixed building when http_ssl and stream_ssl
       unavailable.

    Core:

    *) Change: increased the default stack size to 160k for njs VM.

    *) Feature: added njs.on('exit') API for qjs engine.

    *) Improvement: optimized memory consumption while streaming
       in qjs.

    *) Bugfix: fixed building qjs engine with clang 19.

    *) Bugfix: fixed building with GCC 15 and -O3.

Changes with njs 0.9.1                                       10 Jul 2025

    nginx modules:

    *) Feature: added Fetch API for QuickJS engine.

    *) Feature: added state file for a shared dictionary.

    *) Bugfix: fixed handling of Content-Length header when
       a body is provided for Fetch API.

    *) Bugfix: fixed qjs engine after bellard/quickjs@458c34d2.

    *) Bugfix: fixed NULL pointer dereference when processing
       If-* headers.

    Core:

    *) Feature: added ECDH support for WebCrypto.

    *) Improvement: reduced memory consumption by the object hash.
       The new hash uses 42% less memory per element.

    *) Improvement: reduced memory consumption for concatenation of
       numbers and strings.

    *) Improvement: reduced memory consumption of
       String.prototype.concat() with scalar values.

    *) Bugfix: fixed segfault in njs_property_query().
       The issue was introduced in b28e50b1 (0.9.0).

    *) Bugfix: fixed Function constructor template injection.

    *) Bugfix: fixed GCC compilation with O3 optimization level.

    *) Bugfix: fixed constant is too large for 'long' warning
       on MIPS -mabi=n32.

    *) Bugfix: fixed compilation with GCC 4.1.

    *) Bugfix: fixed %TypedArray%.from() with the buffer is detached
       by the mapper.

    *) Bugfix: fixed %TypedArray%.prototype.slice() with overlapping
       buffers.

    *) Bugfix: fixed handling of detached buffers for typed arrays.

    *) Bugfix: fixed frame saving for async functions with
       closures.

    *) Bugfix: fixed RegExp compilation of patterns with
       escaped '[' characters.

Changes with njs 0.9.0                                       06 May 2025

     Core:

     *) Feature: refactored working with built-in strings, symbols
        and small integers.
        Performance improvements (arewefastyet/benchmarks/v8-v7 benchmark):
        Richards: +57% (631 → 989)
        Crypto: +7% (1445 → 1551)
        RayTrace: +37% (562 → 772)
        NavierStokes: +20% (2062 → 2465)
        Overall score: +29% (1014 → 1307)

    *) Bugfix: fixed regexp undefined value of captured group.

    *) Bugfix: fixed GCC 15 build with -Wunterminated-string-initialization.

Changes with njs 0.8.10                                      08 Apr 2025

    nginx modules:

    *) Feature: reading r.requestText or r.requestBuffer from
       a temp file.
       Previously, an exception was thrown when accessing r.requestText
       or r.requestBuffer if a client request body size exceeded
       client_body_buffer_size.

    *) Improvement: improved reporting of unhandled promise rejections.

    *) Bugfix: fixed name corruption in variable and header processing.

    *) Bugfix: fixed SharedDict.incr() with empty init argument
       for QuickJS engine.

    *) Bugfix: accepting response headers with underscore characters
       in Fetch API.

    Core:

    *) Change: fixed serializeToString().
       Previously, serializeToString() was exclusiveC14n() which returned
       string instead of Buffer. According to the published documentation it
       should be c14n().

    *) Feature: added WebCrypto API for QuickJS engine.

    *) Feature: added TextEncoder/TextDecoder for QuickJS engine.

    *) Feature: added querystring module for QuickJS engine.

    *) Feature: added crypto module for QuickJS engine.

    *) Feature: added xml module for QuickJS engine.

    *) Feature: added support for QuickJS-NG library.

    *) Bugfix: fixed buffer.concat() with a single argument in quickjs.

    *) Bugfix: added missed syntax error for await in template literal.

    *) Bugfix: fixed non-NULL terminated strings formatting in
       exceptions for QuickJS engine.

    *) Bugfix: fixed compatibility with recent change in QuickJS
       and QuickJS-NG.

Changes with njs 0.8.9                                       14 Jan 2025

    nginx modules:

    *) Bugfix: removed extra VM creation per server.
       Previously, when js_import was declared in http or stream blocks,
       an extra copy of the VM instance was created for each server
       block. This was not needed and consumed a lot of memory for
       configurations with many server blocks.

      This issue was introduced in 9b674412 (0.8.6) and was partially
      fixed for location blocks only in 685b64f0 (0.8.7).

    Core:

    *) Feature: added fs module for QuickJS engine.

Changes with njs 0.8.8                                       10 Dec 2024

    nginx modules:

    *) Feature: implemented shared dictionary for QuickJS engine.

    *) Improvement: js_preload_object is refactored.

    *) Bugfix: fixed limit rated output.

    *) Bugfix: optimized use of SSL contexts for
       js_fetch_trusted_certificate directive.

    Core:

    *) Feature: implemented process object for QuickJS engine.

    *) Feature: implemented process.kill() method.

    *) Bugfix: fixed tests with libxml2 2.13 and later.

    *) Bugfix: fixed promise resolving when Promise is inherited.

    *) Bugfix: fixed absolute scope in cloned VMs.

Changes with njs 0.8.7                                       22 Oct 2024

    nginx modules:

    *) Bugfix: eliminated unnecessary VM creation.
       Previously, njs consumed memory proportionally to the number of
       nginx locations. The issue was introduced in 9b674412 (0.8.6).

    *) Improvement: added strict syntax validation for js_body_filter.

    *) Improvement: improved error messages for module loading
       failures.

    Core:

    *) Feature: implemented fs.readlink() and friends.

    *) Improvement: implemented lazy stack symbolization.

    *) Bugfix: fixed heap-buffer-overflow in Buffer.prototype.indexOf().
       The issue was introduced in 5d15a8d6 (0.8.6).

    *) Bugfix: fixed Buffer.prototype.lastIndexOf() when `from` is
       provided.

Changes with njs 0.8.6                                       02 Oct 2024

    nginx modules:

    *) Feature: introduced QuickJS engine.

    *) Feature: added optional nocache flag for js_set directive.
       Thanks to Thomas P.

    *) Feature: exposed capture group variables in HTTP module.
       Thanks to Thomas P.

    Core:

    *) Feature: added Buffer module for QuickJS engine.

    *) Bugfix: fixed handling of empty labelled statement in a function.

    *) Bugfix: fixed Function constructor handling when called without
       arguments.

    *) Bugfix: fixed Buffer.prototype.writeInt8() and friends.

    *) Bugfix: fixed Buffer.prototype.writeFloat() and friends.

    *) Bugfix: fixed Buffer.prototype.lastIndexOf().

    *) Bugfix: fixed Buffer.prototype.write().

    *) Bugfix: fixed maybe-uninitialized warnings in error creation.

    *) Bugfix: fixed 'ctx.codepoint' initialization in UTF-8 decoding.

    *) Bugfix: fixed 'length' initialization in Array.prototype.pop().

    *) Bugfix: fixed handling of encode arg in fs.readdir() and
       fs.realpath().

Changes with njs 0.8.5                                       25 Jun 2024

    nginx modules:

    *) Change: r.variables.var, r.requestText, r.responseText,
       s.variables.var, and the "data" argument of the s.on() callback
       with "upload" or "download" event types will now convert bytes
       invalid in UTF-8 encoding into the replacement character.  When
       working with binary data, use r.rawVariables.var, r.requestBuffer,
       r.responseBuffer, s.rawVariables.var, and the "upstream" or
       "downstream" event type for s.on() instead.

    *) Feature: added timeout argument for shared dictionary methods
       add(), set() and incr().

    *) Bugfix: fixed checking for duplicate js_set variables.

    *) Bugfix: fixed request Host header when the port is non-standard.

    *) Bugfix: fixed handling of a zero-length request body in ngx.fetch()
       and r.subrequest().

    *) Bugfix: fixed heap-buffer-overflow in Headers.get().

    *) Bugfix: fixed r.subrequest() error handling.

    Core:

    *) Feature: added zlib module for QuickJS engine.

    *) Bugfix: fixed zlib.inflate().

    *) Bugfix: fixed String.prototype.replaceAll() with zero-length
       argument.

    *) Bugfix: fixed retval handling after an exception in
       Array.prototype.toSpliced(), Array.prototype.toReversed(),
       Array.prototype.toSorted().

    *) Bugfix: fixed RegExp.prototype[@@replace]() with replacements
       containing "$'", "$\`" and strings with Unicode characters.

    *) Bugfix: fixed a one-byte overread in decodeURI() and
       decodeURIComponent().

    *) Bugfix: fixed tracking of argument scope.

    *) Bugfix: fixed integer overflow in Date.parse().


Changes with njs 0.8.4                                       16 Apr 2024

    nginx modules:

    *) Feature: allowing to set Server header for outgoing headers.

    *) Improvement: validating URI and args arguments in r.subrequest().

    *) Improvement: checking for duplicate js_set variables.

    *) Bugfix: fixed clear() method of a shared dictionary without
       timeout introduced in 0.8.3.

    *) Bugfix: fixed r.send() with Buffer argument.

    Core:

    *) Feature: added QuickJS engine support in CLI.

    *) Bugfix: fixed atob() with non-padded base64 strings.

Changes with njs 0.8.3                                       07 Feb 2024

    nginx modules:

    *) Bugfix: fixed Headers.set().

    *) Bugfix: fixed js_set with Buffer values.

    *) Bugfix: fixed clear() method of a shared dictionary when
       a timeout is not specified.

    *) Bugfix: fixed stub_status statistics when js_periodic is
       enabled.

    Core:

    *) Bugfix: fixed building with libxml2 2.12 and later.

    *) Bugfix: fixed Date constructor for overflows and with
       NaN values.

    *) Bugfix: fixed underflow in querystring.parse().

    *) Bugfix: fixed potential buffer overread in
       String.prototype.match().

    *) Bugfix: fixed parsing of for-in loops.

    *) Bugfix: fixed parsing of hexadecimal, octal, and binary
       literals with no digits.

Changes with njs 0.8.2                                       24 Oct 2023

    nginx modules:

    *) Feature: introduced console object. The following methods
       were introduced: error(), info(), log(), time(), timeEnd(),
       warn().

    *) Bugfix: fixed HEAD response handling with large Content-Length
       in fetch API.

    *) Bugfix: fixed items() method for a shared dictionary.

    *) Bugfix: fixed delete() method for a shared dictionary.

    Core:

    *) Feature: extended "fs" module. Added existsSync().

    *) Bugfix: fixed "xml" module. Fixed broken XML exception handling
       in parse() method.

    *) Bugfix: fixed RegExp.prototype.exec() with global regexp and
       unicode input.

    *) Bugfix: fixed return statement parsing with invalid expression.

Changes with njs 0.8.1                                       12 Sep 2023

    nginx modules:

    *) Feature: introduced js_periodic directive.
        The directive specifies a JS handler to run at regular intervals.

    *) Feature: implemented items() method for a shared dictionary.
       The method returns all the non-expired key-value pairs.

    *) Bugfix: fixed size() and keys() methods of a shared dictionary.

    *) Bugfix: fixed erroneous exception in r.internalRedirect()
       introduced in 0.8.0.

    Core:

    *) Bugfix: fixed incorrect order of keys in
       Object.getOwnPropertyNames().

Changes with njs 0.8.0                                        6 Jul 2023

    nginx modules:

    *) Change: removed special treatment of forbidden headers in Fetch API
       introduced in 0.7.10.

    *) Change: removed deprecated since 0.5.0 r.requestBody and
       r.responseBody in HTTP module.

    *) Change: throwing an exception in r.internalRedirect() while
       filtering in HTTP module.

    *) Feature: introduced global nginx properties.
        ngx.build - an optional nginx build name, corresponds to
        --build=name argument of configure script, by default is "".
        ngx.conf_file_path - the file path to current nginx configuration
            file.
        ngx.error_log_path - the file path to current error log file.
        ngx.prefix - the directory that keeps server files.
        ngx.version - the nginx version as a string, for example: "1.25.0".
        ngx.version_number - the nginx version as a number, for example:
            1025000.
        ngx.worker_id - corresponds to an nginx internal worker id.
           The value is between 0 and worker_processes - 1.

    *) Feature: introduced js_shared_dict_zone directive.
        The directive allows to declare a dictionary that is shared among the
        working processes.

    *) Improvement: added compile-time options to disable njs modules.
        For example to disable libxslt related code:
        NJS_LIBXSLT=NO ./configure  .. --add-module=/path/to/njs/module

    *) Bugfix: fixed r.status setter when filtering in HTTP module.

    *) Bugfix: fixed setting of Location header in HTTP module.

    Core:

    *) Change: native methods are provided with retval argument.
       This change breaks compatibility with C extension for njs
       requiring to modify the code.

    *) Change: non-compliant deprecated String methods were removed.
        The following methods were removed: String.bytesFrom(),
        String.prototype.fromBytes(), String.prototype.fromUTF8(),
        String.prototype.toBytes(), String.prototype.toUTF8(),
        String.prototype.toString(encoding).

    *) Change: removed support for building with GNU readline.

    *) Feature: added Array.from(), Array.prototype.toSorted(),
        Array.prototype.toSpliced(), Array.prototype.toReversed().

    *) Feature: added %TypedArray%.prototype.toSorted(),
        %TypedArray%.prototype.toSpliced(),
        %TypedArray%.prototype.toReversed().

    *) Feature: added CryptoKey properties in WebCrypto.
        The following properties for CryptoKey were added:
        algorithm, extractable, type, usages.

    *) Bugfix: fixed retval of crypto.getRandomValues().

    *) Bugfix: fixed evaluation of computed property names with function
       expressions.

    *) Bugfix: fixed implicit name for a function expression declared in
       arrays.

    *) Bugfix: fixed parsing of for-in loops.

    *) Bugfix: fixed Date.parse() with ISO-8601 format and UTC time
       offset.

Changes with njs 0.7.12                                       10 Apr 2023

    nginx modules:

    *) Bugfix: fixed Headers() constructor in Fetch API.

    Core:

    *) Feature: added Hash.copy() method in "crypto" module.

    *) Feature: added "zlib" module.

    *) Improvement: added support for export {name as default}
       statement.

    *) Bugfix: fixed Number constructor according to the spec.

Changes with njs 0.7.11                                        9 Mar 2023
    nginx modules:

    *) Bugfix: added missed linking with libxml2 for the dynamic module.
       The bug was introduced in 0.7.10.

    Core:

    *) Feature: added XMLNode API to modify XML documents.

    *) Change: removed XML_PARSE_DTDVALID during parsing of XML document
       due to security implications. The issue was introduced
       in 0.7.10. When XML_PARSE_DTDVALID is enabled, libxml2 parses and
       executes external entities present inside an XML document.

    *) Bugfix: fixed the detection of await in arguments.

    *) Bugfix: fixed Error() instance dumping when "name" prop is not
       primitive.

    *) Bugfix: fixed array instance with a getter property dumping.

    *) Bugfix: fixed njs_object_property() with NJS_WHITEOUT properties.

    *) Bugfix: fixed func instance dumping with "name" as getter.

    *) Bugfix: fixed attaching of a stack to an error object.

    *) Bugfix: fixed String.prototype.replace() with replacement containing
       "$'", "$`".

Changes with njs 0.7.10                                        7 Feb 2023
    nginx modules:

    *) Feature: added Request, Response and Headers ctors in Fetch API.

    *) Bugfix: fixed nginx logger callback for calls in master process.

    Core:

    *) Feature: added signal support in CLI.

    *) Feature: added "xml" module for working with XML documents.

    *) Feature: extended support for symmetric and asymmetric keys
       in WebCrypto. Most notably JWK format for importKey() was added.

    *) Feature: extended support for symmetric and asymmetric keys
       in WebCrypto. Most notably JWK format for importKey() was added.
       generateKey() and exportKey() were also implemented.

    *) Feature: added String.prototype.replaceAll().

    *) Bugfix: fixed for(expr1; conditional syntax error handling.

    *) Bugfix: fixed Object.values() and Object.entries() with external
       objects.

    *) Bugfix: fixed RegExp.prototype[@@replace]().

Changes with njs 0.7.9                                        17 Nov 2022
    nginx modules:

    *) Bugfix: fixed Fetch Response prototype reinitialization.
       When at least one js_import directive was declared in both HTTP
       and Stream, ngx.fetch() returned inapproriate response in Stream.
       The bug was introduced in 0.7.7.

    Core:

    *) Bugfix: fixed String.prototype.replace(re) if re.exec() returns
       non-flat array.

    *) Bugfix: fixed Array.prototype.fill() when start object changes
       "this".

    *) Bugfix: fixed description for fs.mkdir() and fs.rmdir() methods.

    *) Bugfix: fixed %TypedArray%.prototype.set(s) when s element changes
       "this".

    *) Bugfix: fixed Array.prototype.splice(s, d) when d resizes "this"
       during evaluation.

    *) Bugfix: fixed for-in loop with left and right hand side
       expressions.

Changes with njs 0.7.8                                        25 Oct 2022

    nginx modules:

    *) Feature: added js_preload_object directive.

    *) Feature: added ngx.conf_prefix property.

    *) Feature: added s.sendUpstream() and s.sendDownstream()
       in stream module.

    *) Feature: added support for HEAD method in Fetch API.

    *) Improvement: improved async callback support for s.send()
       in stream module.

    Core:

    *) Feature: added "name" instance property for a function
       object.

    *) Feature: added njs.memoryStats object.

    *) Bugfix: fixed String.prototype.trimEnd() with unicode
       string.

    *) Bugfix: fixed Object.freeze() with fast arrays.

    *) Bugfix: fixed Object.defineProperty() with fast arrays.

    *) Bugfix: fixed async token as a property name of an object.

    *) Bugfix: fixed property set instruction when key modifies
       base binding.

    *) Bugfix: fixed complex assignments.

    *) Bugfix: fixed handling of unhandled promise rejection.

    *) Bugfix: fixed process.env when duplicate environ variables
       are present.

    *) Bugfix: fixed double declaration detection in modules.

    *) Bugfix: fixed bound function calls according to the spec.

    *) Bugfix: fixed break label for if statement.

    *) Bugfix: fixed labeled empty statements.

Changes with njs 0.7.7                                        30 Aug 2022

    nginx modules:

    *) Feature: the number of nginx configuration contexts where
       js directives can be specified is extended.

       HTTP: js_import, js_path, js_set and js_var are allowed
       in server and location contexts. js_content, js_body_filter
       and js_header_filter are allowed in 'if' context.

       Stream: js_import, js_path, js_set and js_var are allowed
       in server context.

    *) Feature: added r.internal property.

    *) Bugfix: fixed reading response body in fetch API.

    *) Bugfix: fixed "js_fetch_timeout" in stream module.

    *) Bugfix: fixed socket leak with 0 fetch timeout.

    Core:

    *) Feature: extended "fs" module.  Added fs.openSync(),
       fs.promises.open(), fs.fstatSync(), fs.readSync(),
       fs.writeSync().

       The following properties of FileHandle are implemented:
       fd, read(), stat(), write(), close().

    *) Bugfix: fixed parseInt(), parseFloat(), Symbol.for()
       with no arguments.

Changes with njs 0.7.6                                        19 Jul 2022

    nginx modules:

    *) Feature: improved r.args object. Added support for multiple
       arguments with the same key. Added case sensitivity for
       keys. Keys and values are percent-decoded now.

    *) Bugfix: fixed r.headersOut setter for special headers.

    Core:

    *) Feature: added Symbol.for() and Symbol.keyfor().

    *) Feature: added btoa() and atob() from WHATWG spec.

    *) Bugfix: fixed large non-decimal literals.

    *) Bugfix: fixed unicode argument trimming in parseInt().

    *) Bugfix: fixed break instruction in a try-catch block.

    *) Bugfix: fixed async function declaration in CLI.

Changes with njs 0.7.5                                        21 Jun 2022

    nginx modules:

    *) Change: adapting to changes in nginx header structures.

    *) Bugfix: fixed r.headersOut special getters when value
       is absent.

    *) Change: returning undefined value instead of an empty string
       for Content-Type when the header is absent.

    Core:

    *) Bugfix: fixed catching of the exception thrown from an
       awaited function.

    *) Bugfix: fixed function value initialization.

    *) Bugfix: fixed interpreter when await fails.

    *) Bugfix: fixed typed-array constructor when source array
       is changed while iterating.

    *) Bugfix: fixed String.prototype.replace() with byte strings.

    *) Bugfix: fixed template literal from producing byte-strings.

    *) Bugfix: fixed array iterator with sparse arrays.

    *) Bugfix: fixed memory free while converting a flat array to
       a slow array.

    *) Bugfix: properly handling NJS_DECLINE in promise native
       functions.

    *) Bugfix: fixed working with an array-like object in Promise.all()
       and friends.


Changes with njs 0.7.4                                        24 May 2022

    nginx modules:

    *) Feature: added extended directive to configure Fetch API.
       The following directives were added: "js_fetch_timeout",
       "js_fetch_verify", "js_fetch_buffer_size",
       "js_fetch_max_response_buffer_size".

    *) Change: r.internalRedirect() now accepts escaped URIs.

    *) Bugfix: fixed Response parsing with more than 8 headers
       in Fetch API.

    Core:

    *) Feature: added njs.version_number property.

    *) Feature: added compatibility with BoringSSL for
       WebCrypto API.

    *) Bugfix: fixed Array.prototype.sort() when arr size is changed
       in a comparator.

    *) Bugfix: fixed Array.prototype.slice() with slow "this" argument.

    *) Bugfix: fixed aggregation methods of Promise ctor with
       array-like object.

    *) Bugfix: fixed Array.prototype.lastIndexOf() with unicode
       string as "this".

    *) Bugfix: fixed JSON.parse() when reviver function is provided.

    *) Bugfix: fixed Object.defineProperty() when a recursive descriptor
       is provided.

    *) Bugfix: fixed Array.prototype.fill() for typed-arrays.

    *) Bugfix: making function expression binding immutable according
       the specs.

    *) Bugfix: fixed redefinition of special props in
       Object.defineProperty().

Changes with njs 0.7.3                                        12 Apr 2022

    Core:

    *) Feature: added support of module resolution callback.
       This feature allows a host environment to control
       how imported modules are loaded.

    *) Bugfix: fixed backtraces while traversing imported user
       modules.

    *) Bugfix: fixed Array.prototype.concat() when "this" is a slow
       array.

    *) Bugfix: fixed frame allocation from an awaited frame.

    *) Bugfix: fixed allocation of large array literals.

    *) Bugfix: fixed interpreter when "toString" conversion fails.

Changes with njs 0.7.2                                        25 Jan 2022

    Core:

    *) Bugfix: fixed Array.prototype.join() when array is changed
       while iterating.

    *) Bugfix: fixed Array.prototype.slice() when array is changed
       while iterating.

    *) Bugfix: fixed Array.prototype.concat() when array is changed
       while iterating.

    *) Bugfix: fixed Array.prototype.reverse() when array is changed
       while iterating.

    *) Bugfix: fixed Buffer.concat() with subarrays.
       Thanks to Sylvain Etienne.

    *) Bugfix: fixed type confusion bug while resolving promises.

    *) Bugfix: fixed Function.prototype.apply() with large array
       arguments.

    *) Bugfix: fixed recursive async function calls.

    *) Bugfix: fixed function redeclaration. The bug was introduced
       in 0.7.0.

Changes with njs 0.7.1                                        28 Dec 2021

    nginx modules:

    *) Change: the "js_include" directive deprecated since 0.4.0 was
       removed.

    *) Change: PCRE/PCRE2-specific code was moved to the modules.
       This ensures that njs uses the same RegExp library as nginx.

    Core:

    *) Feature: extended "fs" module. Added stat(), fstat()
       and friends.

    *) Change: default RegExp engine for CLI is switched
       to PCRE2.

    *) Bugfix: fixed decodeURI() and decodeURIComponent() with
       invalid byte strings. The bug was introduced in 0.4.3.

    *) Bugfix: fixed heap-use-after-free in await frame.
       The bug was introduced in 0.7.0.

    *) Bugfix: fixed WebCrypto sign() and verify() methods
       with OpenSSL 3.0.

    *) Bugfix: fixed exception throwing when RegExp match fails.
       The bug was introduced in 0.1.15.

    *) Bugfix: fixed catching of exception thrown in try block
       of async function. The bug was introduced in 0.7.0.

    *) Bugfix: fixed execution of async function in synchronous
       context. The bug was introduced in 0.7.0.

    *) Bugfix: fixed function redeclaration in CLI when interactive
       mode is on. The bug was introduced in 0.6.2.

    *) Bugfix: fixed typeof operator with DataView object.

    *) Bugfix: eliminated information leak in Buffer.from().

Changes with njs 0.7.0                                        19 Oct 2021

    nginx modules:

    *) Feature: added HTTPS support for Fetch API.

    *) Feature: added setReturnValue() method.

    Core:

    *) Feature: introduced Async/Await implementation.

    *) Feature: added WebCrypto API implementation.

    *) Bugfix: fixed copying of closures for declared
       functions. The bug was introduced in 0.6.0.

    *) Bugfix: fixed unhandled promise rejection in handle
       events.

    *) Bugfix: fixed Response.headers getter in Fetch API.

Changes with njs 0.6.2                                        31 Aug 2021

    nginx modules:

    *) Bugfix: fixed CPU hog when js_filter is registered
       in both directions.

    Core:

    *) Feature: introduced AggregateError implementation.

    *) Feature: added remaining Promise constructor methods.
       The following methods were added: Promise.all(),
       Promise.allSettled(), Promise.any(), Promise.race().

    *) Improvement: removed recursion from code generator.

    *) Bugfix: fixed rest parameter parsing without binding
       identifier.

    *) Bugfix: fixed resolve/reject callback for
       Promise.prototype.finally().

    *) Bugfix: fixed %TypedArray%.prototype.join() with
       detached buffer.

    *) Bugfix: fixed memory leak in interactive shell.

Changes with njs 0.6.1                                        29 Jun 2021

    *) Bugfix: fixed RegExpBuiltinExec() with UTF-8 only regexps.
       The bug was introduced in 0.4.2.

    *) Bugfix: fixed parsing of export default declaration with
       non-assignment expressions.
       Thanks to Artem S. Povalyukhin.

Changes with njs 0.6.0                                        15 Jun 2021

    Core:

    *) Feature: added let and const declaration support.

    *) Feature: added RegExp.prototype[Symbol.split].

    *) Feature: added sticky flag support for RegExp.

    *) Bugfix: fixed heap-buffer-overflow in
       String.prototype.lastIndexOf().

    *) Bugfix: fixed RegExp.prototype.test() according to the
       specification.

    *) Bugfix: fixed String.prototype.split() according to the
       specification.

    *) Bugfix: fixed use-of-uninitialized-value while tracking
       rejected promises.

    *) Bugfix: fixed njs.dump() for objects with circular
       references.

Changes with njs 0.5.3                                        30 Mar 2021

    nginx modules:

    *) Feature: added the "js_var" directive.

Changes with njs 0.5.2                                        09 Mar 2021

    nginx modules:

    *) Feature: added the "js_body_filter" directive.

    *) Feature: introduced the "status" property for stream session
       object.

    Core:

    *) Feature: added njs.on('exit') callback support.

    *) Bugfix: fixed property descriptor reuse for not extensible
       objects.
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed Object.freeze() and friends according to
       the specification.
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed Function() in CLI mode.

    *) Bugfix: fixed for-in iteration of typed array values.
       Thanks to Artem S. Povalyukhin.

Changes with njs 0.5.1                                        16 Feb 2021

    nginx modules:

    *) Feature: introduced ngx.fetch() method implementing Fetch API.
       The following init options are supported:
       body, headers, buffer_size (nginx specific),
       max_response_body_size (nginx specific), method.

       The following properties and methods of Response object are
       implemented: arrayBuffer(), bodyUsed, json(), headers, ok,
       redirect, status, statusText, text(), type, url.

       The following properties and methods of Header object are
       implemented: get(), getAll(), has().

       Notable limitations: only the http:// scheme is supported,
       redirects are not handled.

       In collaboration with 洪志道 (Hong Zhi Dao).

    *) Feature: added the "js_header_filter" directive.

    *) Bugfix: fixed processing buffered data in body filter
       in stream module.

    Core:

    *) Bugfix: fixed safe mode bypass in Function constructor.

    *) Bugfix: fixed Date.prototype.toISOString() with invalid date
       values.

Changes with njs 0.5.0                                         01 Dec 2020

    nginx modules:

    *) Feature: introduced global "ngx" object.
       The following methods were added:
         ngx.log(level, msg)

       The following properties were added:
         ngx.INFO,
         ngx.WARN,
         ngx.ERR.

    *) Feature: added support for Buffer object where string
       is expected.

    *) Feature: added Buffer version of existing properties.
       The following properties were added:
       r.requestBuffer (r.requestBody),
       r.responseBuffer (r.responseBody),
       r.rawVariables (r.variables),
       s.rawVariables (s.variables).

       The following events were added in stream module:
       upstream (upload),
       downstream (download).

    *) Improvement: added aliases to existing properties.
       The following properties were added:
       r.requestText (r.requestBody),
       r.responseText (r.responseBody).

    *) Improvement: throwing an exception in r.internalRedirect()
       for a subrequest.

    *) Bugfix: fixed promise r.subrequest() with error_page redirect.

    *) Bugfix: fixed promise events handling.

    Core:

    *) Feature: added TypeScript definitions for built-in
       modules.
       Thanks to Jakub Jirutka.

    *) Feature: tracking unhandled promise rejection.

    *) Feature: added initial iterator support.
       Thanks to Artem S. Povalyukhin.

    *) Improvement: TypeScript definitions are refactored.
       Thanks to Jakub Jirutka.

    *) Improvement: added forgotten support for
       Object.prototype.valueOf() in Buffer.from().

    *) Bugfix: fixed heap-use-after-free in JSON.parse().

    *) Bugfix: fixed heap-use-after-free in JSON.stringify().

    *) Bugfix: fixed JSON.stringify() for arrays resizable via
       getters.

    *) Bugfix: fixed heap-buffer-overflow for
       RegExp.prototype[Symbol.replace].

    *) Bugfix: fixed returned value for Buffer.prototype.write*
       functions.

    *) Bugfix: fixed querystring.stringify().
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed the catch handler for
       Promise.prototype.finally().

    *) Bugfix: fixed querystring.parse().

Changes with njs 0.4.4                                           29 Sep 2020

    nginx modules:

    *) Bugfix: fixed location merge.

    *) Bugfix: fixed r.httpVersion for HTTP/2.

    Core:

    *) Feature: added support for numeric separators (ES12).

    *) Feature: added remaining methods for %TypedArray%.prototype.
       The following methods were added: every(), filter(), find(),
       findIndex(), forEach(), includes(), indexOf(), lastIndexOf(),
       map(), reduce(), reduceRight(), reverse(), some().

    *) Feature: added %TypedArray% remaining methods.
       The following methods were added: from(), of().

    *) Feature: added DataView object.

    *) Feature: added Buffer object implementation.

    *) Feature: added support for ArrayBuffer in
       TextDecoder.prototype.decode().

    *) Feature: added support for Buffer object in "crypto" methods.

    *) Feature: added support for Buffer object in "fs" methods.

    *) Change: Hash.prototype.digest() and Hmac.prototype.digest()
       now return a Buffer instance instead of a byte string when
       encoding is not provided.

    *) Change: fs.readFile() and friends now return a Buffer instance
       instead of a byte string when encoding is not provided.

    *) Bugfix: fixed function "prototype" property handler while
       setting.

    *) Bugfix: fixed function "constructor" property handler while
       setting.

    *) Bugfix: fixed String.prototype.indexOf() for byte strings.

    *) Bugfix: fixed RegExpBuiltinExec() with a global flag and
       byte strings.

    *) Bugfix: fixed RegExp.prototype[Symbol.replace] when the
       replacement value is a function.

    *) Bugfix: fixed TextDecoder.prototype.decode() with non-zero
       TypedArray offset.

Changes with njs 0.4.3                                           11 Aug 2020

    Core:

    *) Feature: added Query String module.

    *) Feature: improved fs.mkdir() to support recursive directory creation.
       Thanks to Artem S. Povalyukhin.

    *) Feature: improved fs.rmdir() to support recursive directory removal.
       Thanks to Artem S. Povalyukhin.

    *) Feature: introduced UTF-8 decoder according to WHATWG encoding spec.

    *) Feature: added TextEncoder/TextDecoder implementation.

    *) Bugfix: fixed parsing return statement without semicolon.

    *) Bugfix: fixed njs_number_to_int32() for big-endian platforms.

    *) Bugfix: fixed unit test on big-endian platforms.

    *) Bugfix: fixed regexp-literals parsing with '=' characters.

    *) Bugfix: fixed pre/post increment/decrement in assignment operations.

Changes with njs 0.4.2                                           07 Jul 2020

    Core:

    *) Feature: added RegExp.prototype[Symbol.replace].

    *) Feature: introduced line level backtrace.

    *) Feature: added %TypedArray%.prototype.sort().

    *) Feature: extended "fs" module. Added mkdir(), readdir(), rmdir()
       and friends.
       Thanks to Artem S. Povalyukhin.

    *) Improvement: parser refactoring.

    *) Bugfix: fixed TypedScript API description for HTTP headers.

    *) Bugfix: fixed TypedScript API description for NjsByteString type.

    *) Bugfix: fixed String.prototype.repeat() according to the
       specification.

    *) Bugfix: fixed parsing of flags for regexp literals.

    *) Bugfix: fixed index generation for global objects in generator.

    *) Bugfix: fixed String.prototype.replace() according to the
       specification.

    *) Bugfix: fixed %TypedArray%.prototype.copyWithin() with nonzero
       byte offset.

    *) Bugfix: fixed Array.prototype.splice() for sparse arrays.

    *) Bugfix: fixed Array.prototype.reverse() for sparse arrays.

    *) Bugfix: fixed Array.prototype.sort() for sparse arrays.

Changes with njs 0.4.1                                           19 May 2020

    *) Feature: added support for multi-value headers in r.headersIn.

    *) Feature: introduced raw headers API.

    *) Feature: added TypedScript API description.

    Core:

    *) Bugfix: fixed Array.prototype.slice() for sparse arrays.

Changes with njs 0.4.0                                           23 Apr 2020

    nginx modules:

    *) Feature: added js_import directive.

    *) Feature: added support for multi-value headers in r.headersOut.

    *) Improvement: iteration over r.headersOut with special headers.

    *) Improvement: iteration over r.headersOut with duplicates.

    *) Change: r.responseBody property handler now returns "undefined"
       instead of throwing an exception if response body is not available.

    Core:

    *) Feature: added script arguments support in CLI.

    *) Feature: converting externals values to native js objects.

    *) Bugfix: fixed NULL-pointer dereference in "__proto__" property
       handler.

    *) Bugfix: fixed handling of no-newline at the end of the script.

    *) Bugfix: fixed RegExp() constructor with empty pattern and
       non-empty flags.

    *) Bugfix: fixed String.prototype.replace() when function
       returns non-string.

    *) Bugfix: fixed reading of pseudofiles in "fs".

Changes with njs 0.3.9                                           03 Mar 2020

    nginx modules:

    *) Feature: added detached mode for r.subrequest(). Responses to
       detached subrequests are ignored. Unlike ordinary subrequests,
       a detached subrequest can be created inside a variable handler.

    Core:

    *) Feature: added promises API for "fs" module.
       Thanks to Artem S. Povalyukhin.

    *) Feature: extended "fs" module. Added access(), symlink(), unlink(),
       realpath() and friends.
       Thanks to Artem S. Povalyukhin.

    *) Improvement: introduced memory-efficient ordinary arrays.

    *) Improvement: lexer refactoring.

    *) Bugfix: fixed matching of native functions in backtraces.

    *) Bugfix: fixed callback invocations in "fs" module.
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed Object.getOwnPropertySymbols().

    *) Bugfix: fixed heap-buffer-overflow in njs_json_append_string().

    *) Bugfix: fixed encodeURI() and decodeURI() according to
       the specification.

    *) Bugfix: fixed Number.prototype.toPrecision().

    *) Bugfix: fixed handling of space argument in JSON.stringify().

    *) Bugfix: fixed JSON.stringify() with Number() and String() objects.

    *) Bugfix: fixed Unicode Escaping in JSON.stringify() according
       to specification.

    *) Bugfix: fixed non-native module importing.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Bugfix: fixed njs.dump() with the Date() instance in a container.

Changes with njs 0.3.8                                           21 Jan 2020

    nginx modules:

    *) Feature: added Promise support for r.subrequest(). If callback
       is not provided r.subrequest() returns an ordinary Promise object
       that resolves to subrequest response object.

    *) Change: r.parent property handler now returns "undefined"
      instead of throwing exception if parent object is not available.

    Core:

    *) Feature: added Promise support. Implemented according to
       the specification without: Promise.all(), Promise.allSettled(),
       Promise.race().

    *) Feature: added initial Typed-arrays support.
       Thanks to Tiago Natel de Moura.

    *) Feature: added ArrayBuffer support.
       Thanks to Tiago Natel de Moura.

    *) Feature: added initial Symbol support.
       Thanks to Artem S. Povalyukhin.

    *) Feature: added externals support for JSON.stringify().

    *) Feature: added Object.is().
       Thanks to Artem S. Povalyukhin.

    *) Feature: added Object.setPrototypeOf().
       Thanks to Artem S. Povalyukhin.

    *) Feature: introduced nullish coalescing operator.
       Thanks to Valentin Bartenev.

    *) Bugfix: fixed Object.getPrototypeOf() according to the
       specification.

    *) Bugfix: fixed Object.prototype.valueOf() according to the
       specification.

    *) Bugfix: fixed JSON.stringify() with unprintable values and
       replacer function.

    *) Bugfix: fixed operator "in" according to the specification.

    *) Bugfix: fixed Object.defineProperties() according to the
       specification.

    *) Bugfix: fixed Object.create() according to the specification.
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed Number.prototype.toString(radix) when
       fast-math is enabled.

    *) Bugfix: fixed RegExp() instance properties.

    *) Bugfix: fixed import segfault.
       Thanks to 洪志道 (Hong Zhi Dao).

Changes with njs 0.3.7                                           19 Nov 2019

    nginx modules:

    *) Improvement: refactored iteration over external objects.

    Core:

    *) Feature: added Object.assign().

    *) Feature: added Array.prototype.copyWithin().

    *) Feature: added support for labels in console.time().

    *) Change: removed console.help() from CLI.

    *) Improvement: moved constructors and top-level objects to
       global object.

    *) Improvement: arguments validation for configure script.

    *) Improvement: refactored JSON methods.

    *) Bugfix: fixed heap-buffer-overflow in njs_array_reverse_iterator()
       function. The following functions were affected:
       Array.prototype.lastIndexOf(), Array.prototype.reduceRight().

    *) Bugfix: fixed [[Prototype]] slot of NativeErrors.

    *) Bugfix: fixed NativeError.prototype.message properties.

    *) Bugfix: added conversion of "this" value to object in
       Array.prototype functions.

    *) Bugfix: fixed iterator for Array.prototype.find() and
       Array.prototype.findIndex() functions.

    *) Bugfix: fixed Array.prototype.includes() and
       Array.prototype.join() with "undefined" argument.

    *) Bugfix: fixed "constructor" property of "Hash" and "Hmac"
       objects.

    *) Bugfix: fixed "__proto__" property of getters and setters.

    *) Bugfix: fixed "Date" object string formatting.

    *) Bugfix: fixed handling of NaN and -0 arguments in Math.min()
       and Math.max().

    *) Bugfix: fixed Math.round() according to the specification.

    *) Bugfix: reimplemented "bound" functions according to
       the specification.

Changes with njs 0.3.6                                           22 Oct 2019

    nginx modules:

    *) Improvement: getting special headers from r.headersIn.

    Core:

    *) Feature: added new Function() support.

    *) Feature: added Number.prototype.toFixed().

    *) Feature: added Number.prototype.toPrecision().

    *) Feature: added Number.prototype.toExponential().

    *) Improvement: making "prototype" property of function
       instances writable.

    *) Improvement: limiting recursion depth while compiling.

    *) Improvement: moving global functions to the global object.

    *) Bugfix: fixed prototype mutation for object literals.

    *) Bugfix: fixed heap-buffer-overflow while parsing regexp literals.

    *) Bugfix: fixed integer-overflow while parsing exponent
       of number literals.

    *) Bugfix: fixed parseFloat().

    *) Bugfix: fixed Array.prototype functions according to the specification.
       The following functions were fixed: every, includes, indexOf, filter,
       find, findIndex, forEach, lastIndexOf, map, pop, push, reduce,
       reduceRight, shift, some, unshift.

    *) Bugfix: fixed handing of accessor descriptors in Object.freeze().

    *) Bugfix: fixed String.prototype.replace() when first argument
       is not a string.

    *) Bugfix: fixed stack-use-after-scope in Array.prototype.map().

    *) Bugfix: Date.prototype.toUTCString() format was aligned to ES9.

    *) Bugfix: fixed buffer overflow in Number.prototype.toString(radix).

    *) Bugfix: fixed Regexp.prototype.test() for regexps with backreferences.

    *) Bugfix: fixed Array.prototype.map() for objects with nonexistent values.

    *) Bugfix: fixed Array.prototype.pop() and shift() for sparse objects.

    *) Bugfix: fixed Date.UTC() according to the specification.

    *) Bugfix: fixed Date() constructor according to the specification.

    *) Bugfix: fixed type of Date.prototype.
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed Date.prototype.setTime().
       Thanks to Artem S. Povalyukhin.

    *) Bugfix: fixed default number of arguments expected by built-in functions.

    *) Bugfix: fixed "caller" and "arguments" properties of a function instance.
       Thanks to Artem S. Povalyukhin.

Changes with njs 0.3.5                                           15 Aug 2019

    Core:

    *) Bugfix: fixed module importing using require(). The bug was
       introduced in 0.3.4.

    *) Bugfix: fixed [[SetPrototypeOf]].

Changes with njs 0.3.4                                           13 Aug 2019

    Core:

    *) Feature: added Object shorthand methods and computed property
       names. Thanks to 洪志道 (Hong Zhi Dao) and Artem S. Povalyukhin.

    *) Feature: added getter/setter literal support.
       Thanks to 洪志道 (Hong Zhi Dao) and Artem S. Povalyukhin.

    *) Feature: added fs.renameSync().

    *) Feature: added String.prototype.trimStart() and
       String.prototype.trimEnd().

    *) Improvement: added memory-sanitizer support.

    *) Improvement: Unicode case tables updated to version 12.1.

    *) Improvement: added UTF8 validation for string literals.

    *) Bugfix: fixed reading files with zero size in fs.readFileSync().

    *) Bugfix: extended the list of space separators in
       String.prototype.trim().

    *) Bugfix: fixed using of uninitialized value in
       String.prototype.padStart().

    *) Bugfix: fixed String.prototype.replace() for '$0' and '$&'
       replacement string.

    *) Bugfix: fixed String.prototype.replace() for byte strings with
       regex argument.

    *) Bugfix: fixed global match in String.prototype.replace()
       with regexp argument.

    *) Bugfix: fixed Array.prototype.slice() for primitive types.

    *) Bugfix: fixed heap-buffer-overflow while importing module.

    *) Bugfix: fixed UTF-8 character escaping.

    *) Bugfix: fixed Object.values() and Object.entries() for shared
       objects.

    *) Bugfix: fixed uninitialized memory access in
       String.prototype.match().

    *) Bugfix: fixed String.prototype.match() for byte strings with
       regex argument.

    *) Bugfix: fixed Array.prototype.lastIndexOf() with undefined
       arguments.

    *) Bugfix: fixed String.prototype.substring() with empty substring.

    *) Bugfix: fixed invalid memory access in
       String.prototype.substring().

    *) Bugfix: fixed String.fromCharCode() for code points > 65535
       and NaN.

    *) Bugfix: fixed String.prototype.toLowerCase() and
       String.prototype.toUpperCase().

    *) Bugfix: fixed Error() constructor with no arguments.

    *) Bugfix: fixed "in" operator for values with accessor descriptors.

    *) Bugfix: fixed Object.defineProperty() for non-boolean descriptor
       props.

    *) Bugfix: fixed Error.prototype.toString() with UTF8 string
       properties.

    *) Bugfix: fixed Error.prototype.toString() with non-string values
       for "name" and "message".

Changes with njs 0.3.3                                           25 Jun 2019

    nginx modules:

    *) Improvement: getting of special response headers in headersOut.

    *) Improvement: working with unknown methods in subrequest().

    *) Improvement: added support for null as a second argument
       of r.subrequest().

    *) Bugfix: fixed processing empty output chain in stream body filter.

    Core:

    *) Feature: added runtime support for property getter/setter.
       Thanks to 洪志道 (Hong Zhi Dao) and Artem S. Povalyukhin.

    *) Feature: added "process" global object.

    *) Feature: writable most of built-in properties and methods.

    *) Feature: added generic implementation of Array.prototype.fill().

    *) Bugfix: fixed integer-overflow in String.prototype.concat().

    *) Bugfix: fixed setting of object properties.

    *) Bugfix: fixed Array.prototype.toString().

    *) Bugfix: fixed Date.prototype.toJSON().

    *) Bugfix: fixed overwriting "constructor" property of built-in
       prototypes.

    *) Bugfix: fixed processing of invalid surrogate pairs in strings.

    *) Bugfix: fixed processing of invalid surrogate pairs in JSON
       strings.

    *) Bugfix: fixed heap-buffer-overflow in toUpperCase() and
       toLowerCase().

    *) Bugfix: fixed escaping lone closing square brackets in RegExp()
       constructor.

    *) Bugfix: fixed String.prototype.toBytes() for ASCII strings.

    *) Bugfix: fixed handling zero byte characters inside RegExp
       pattern strings.

    *) Bugfix: fixed String.prototype.toBytes() for ASCII strings.

    *) Bugfix: fixed truth value of JSON numbers in JSON.parse().

    *) Bugfix: fixed use-of-uninitialized-value in
       njs_string_replace_join().

    *) Bugfix: fixed parseInt('-0').
       Thanks to Artem S. Povalyukhin.

Changes with njs 0.3.2                                           21 May 2019

    Core:

    *) Feature: added support for template literals.
       Thanks to 洪志道 (Hong Zhi Dao) and Artem S. Povalyukhin.

    *) Feature: executing command from command line arguments.

    *) Feature: added support for RegExp "groups" object (ES9).

    *) Feature: added block scoped function definitions support.

    *) Feature: added support for building with GNU Readline library.

    *) Feature: made configurable "length", "name", and most of built-in
       methods.

    *) Feature: made all constructor properties configurable.

    *) Bugfix: fixed Regexp.prototype.exec() for Unicode-only regexps.

    *) Bugfix: fixed njs_vm_value_dump() for empty string values.

    *) Bugfix: fixed RegExp constructor for regexp value arguments.

    *) Bugfix: fixed walking over prototypes chain during iteration
       over an object.

    *) Bugfix: fixed overflow in Array.prototype.concat().

    *) Bugfix: fixed length calculation for UTF-8 string with escape
       characters.

    *) Bugfix: fixed parsing surrogate pair presents as UTF-16 escape
       sequences.

    *) Bugfix: fixed processing asterisk quantifier for
       String.prototype.match().

    *) Bugfix: fixed Date() constructor with one argument.

    *) Bugfix: fixed arrays expansion.

    *) Bugfix: fixed heap-buffer-overflow in String.prototype.replace().

    *) Bugfix: fixed heap-buffer-overflow in
       String.prototype.lastIndexOf().

    *) Bugfix: fixed regexp literals parsing with escaped backslash and
       backslash in square brackets.

    *) Bugfix: fixed regexp literals with lone closing brackets.

    *) Bugfix: fixed uninitialized-memory-access in
       Object.defineProperties().

    *) Bugfix: fixed processing "*" quantifier for
       String.prototype.replace().

    *) Bugfix: fixed Array.prototype.slice() for UTF8-invalid byte
       strings.

    *) Bugfix: fixed String.prototype.split() for UTF8-invalid byte
       strings.

    *) Bugfix: fixed handling of empty block statements.

Changes with njs 0.3.1                                           16 Apr 2019

    Core:

    *) Feature: added arrow functions support.
       Thanks to 洪志道 (Hong Zhi Dao) and Artem S. Povalyukhin.

    *) Feature: added Object.getOwnPropertyNames().
       Thanks to Artem S. Povalyukhin.

    *) Feature: added Object.getOwnPropertyDescriptors().
       Thanks to Artem S. Povalyukhin.

    *) Feature: making __proto__ accessor descriptor of Object instances
       mutable.

    *) Feature: added shebang support in CLI.

    *) Feature: added support for module mode execution in CLI. In module
       mode global this is unavailable.

    *) Bugfix: fixed editline detection.

    *) Bugfix: fixed Function.prototype.bind().
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Bugfix: fixed checking of duplication of parameters for functions.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Bugfix: fixed function declaration with the same name as a variable.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Improvement: code related to parsing of objects, variables and
       functions is refactored.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Improvement: console.log() improved for outputting large values.

    *) Improvement: console.log() improved for outputting strings in a
       compliant way (without escaping and quotes).

    *) Improvement: using ES6 version of ToInt32(), ToUint32(), ToLength().

Changes with njs 0.3.0                                           26 Mar 2019

    nginx modules:

    *) Feature: added js_path directive.

    *) Change: returning undefined value instead of empty strings
       for absent properties in the following objects: r.args,
       r.headersIn, r.headersOut, r.variables, s.variables.

    *) Change: returning undefined value instead of throwing an
       exception for r.requestBody when request body is unavailable.

    *) Bugfix: fixed crash while iterating over r.args when a value is
       absent in a key-value pair.

    Core:

    *) Feature: added initial ES6 modules support. Default import and
       default export statements are supported.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Feature: added Object.prototype.propertyIsEnumerable().

    *) Feature: reporting file name and function name in disassembler
       output.

    *) Bugfix: fixed function redeclarations in interactive shell.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Bugfix: fixed RegExp literals parsing.

    *) Bugfix: fixed setting length of UTF8 string in fs.readFileSync().

    *) Bugfix: fixed nxt_file_dirname() for paths with no dir component.

Changes with njs 0.2.8                                           26 Feb 2019

    nginx modules:

    *) Change: properties of HTTP request deprecarted in 0.2.2 are
       removed.

    *) Feature: added support for delete operation in r.headersOut.

    *) Feature: added support for setting nginx variables.

    *) Bugfix: fixed r.subrequest() for empty body value.

    *) Improvement: setting special response headers in r.headersOut.

    Core:

    *) Feature: added labels support.

    *) Feature: added setImmediate() method.

    *) Feature: added support for shorthand property names for Object
       literals.

    *) Bugfix: fixed Function.prototype.bind().

    *) Bugfix: fixed parsing of string literals containing newline
       characters.

    *) Bugfix: fixed line number in reporting variable reference errors.

    *) Bugfix: fixed creation of long UTF8 strings.

    *) Bugfix: fixed String.prototype.split() for unicode strings.

    *) Bugfix: fixed heap-buffer-overflow in String.prototype.split().

    *) Bugfix: fixed Array.prototype.fill().
       Thanks to Artem S. Povalyukhin.

    *) Improvement: code related to function invocation is refactored.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Improvement: code related to variables is refactored.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Improvement: parser is refactored.
       Thanks to 洪志道 (Hong Zhi Dao).

    *) Improvement: reporting filenames in exceptions.

Changes with njs 0.2.7                                           25 Dec 2018

    Core:

    *) Feature: rest parameters syntax (destructuring is not supported).
       Thanks to Alexander Pyshchev.

    *) Feature: added Object.entries() method.

    *) Feature: added Object.values() method.

    *) Improvement: code generator refactored and simplified.

    *) Bugfix: fixed automatic semicolon insertion.

    *) Bugfix: fixed assignment expression from compound assignment.

    *) Bugfix: fixed comparison of Byte and UTF8 strings.

    *) Bugfix: fixed type of iteration variable in for-in with array
       values.

    *) Bugfix: fixed building on paltforms without librt.

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.6                                           27 Nov 2018

    Core:

    *) Feature: making built-in prototypes mutable.

    *) Feature: making global object mutable.

    *) Feature: console.time() and console.timeEnd() methods.

    *) Feature: allowing variables and functions to be redeclared.

    *) Feature: extending Object.defineProperty() spec conformance.

    *) Feature: introduced quiet mode for CLI to handle simple expressions
       from stdin.

    *) Feature: introduced compact form of backtraces to handle stack
       overflows.

    *) Improvement: improved wording for various exceptions.

    *) Bugfix: fixed closure values handling.

    *) Bugfix: fixed equality operator for various value types.

    *) Bugfix: fixed handling of "this" keyword in various scopes.

    *) Bugfix: fixed handling non-object values in Object.keys().

    *) Bugfix: fixed parsing of throw statement inside if statement.

    *) Bugfix: fixed parsing of newline after throw statement.

    *) Bugfix: fixed parsing of statements in if statement without newline.

    *) Bugfix: fixed size uint32_t overflow in njs_array_expand().

    *) Bugfix: fixed typeof operator for object_value type.

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.5                                           30 Oct 2018

    nginx modules:

    *) Bugfix: fixed counting pending events in stream module.

    *) Bugfix: fixed s.off() in stream module.

    *) Bugfix: fixed processing of data chunks in js_filter in stream module.

    *) Bugfix: fixed http status and contentType getter in http module.

    *) Bugfix: fixed http response and parent getters in http module.

    Core:

    *) Feature: arguments object support.

    *) Feature: non-integer fractions support.

    *) Improvement: handling non-array values in Array.prototype.slice().

    *) Bugfix: fixed Array.prototype.length setter.

    *) Bugfix: fixed njs_array_alloc() for length > 2**31.

    *) Bugfix: handling int overflow in njs_array_alloc() on 32bit
       archs.

    *) Bugfix: fixed code size mismatch error message.

    *) Bugfix: fixed delete operator in a loop.

    *) Bugfix: fixed Object.getOwnPropertyDescriptor() for complex
       object (inherited from Array and string values).

    *) Bugfix: fixed Object.prototype.hasOwnProperty() for non-object
       properties.

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.4                                           18 Aug 2018

    nginx modules:

    *) Change: stream module handlers are refactored.

       New methods and properties:
       s.on(), s.off(), s.allow(), s.done(), s.decline(),
       s.deny().

       Removed properties of Stream object:
       s.OK, s.ABORT, s.AGAIN, s.DECLINED, s.ERROR (replaced
       with s.allow(), s.done([code]), s.deny()).

       s.buffer (for reading replaced with data argument of
       the corresponding callback, for writing use s.send()).

       s.fromUpstream (replaced with a callback for a corresponding
       event).

       s.eof (replaced with flags.last).

    Core:

    *) Feature: added Function.prototype.length.

    *) Feature: introduced sandboxing mode.

    *) Improvement: added exception strings where appropriate.

    *) Improvement: improved wording for primitive type conversion
       exception.

    *) Bugfix: throwing TypeError for attempts to change frozen
       properties.

    *) Bugfix: fixed Object.defineProperty() for existing properties.

    *) Bugfix: respecting the enumerable attribute while iterating
       by for in.

    *) Bugfix: respecting writable attribute for property handlers.

    *) Bugfix: fixed exception handling in arguments of a function.

    *) Bugfix: fixed Object.prototype.toString for different
       value types.

    *) Bugfix: fixed Object() constructor for object types arguments.

    *) Bugfix: fixed comparison of objects and strings.

    *) Bugfix: fixed String.slice() for undefined arguments.

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.3                                           31 Jul 2018

    nginx modules:

    *) Bugfix: making a subrequest from a Reply object caused
        a segmentation fault.

    *) Bugfix: getting the parent property of the main Request
        object caused a segmentation fault.

    Core:

    *) Feature: added the pretty string representation for values.

    *) Feature: correctly printing floating point numbers.

    *) Feature: correctly parsing floating point numbers.

    *) Feature: String.bytesFrom() method (decoding hex, base64,
        base64url into a byte string).

    *) Feature: String.padStart() and String.padEnd() methods.

    *) Feature: added support of binary literals.

    *) Improvement: added information about illegal token in number parsing.

    *) Improvement: allowed uppercased O in octal literal values.

    *) Improvement: added support for multiple arguments in console.log().

    *) Bugfix: fixed applying call() to methods of external values.

    *) Bugfix: fixed addition operator applied to an object.

    *) Bugfix: fixed exception handling in njs_vm_value_to_ext_string().

    *) Bugfix: fixed Number() with boolean, null and undefined arguments.

    *) Bugfix: fixed error handling of setting non-numeric Array.length.

    *) Bugfix: fixed autocompletion for global objects.

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.2                                           19 Jun 2018

    nginx modules:

    *) Change: merged HTTP Response and Reply into Request.
        New members of Request:
        req.status (res.status)
        req.parent (reply.parent)
        req.requestBody (req.body)
        req.responseBody (reply.body)
        req.headersIn (req.headers)
        req.headersOut (res.headers)
        req.sendHeader() (res.sendHeader())
        req.send() (res.send())
        req.finish() (res.finish())
        req.return() (res.return())

        Deprecated members of Request:
        req.body (use req.requestBody or req.responseBody)
        req.headers (use req.headersIn or req.headersOut)
        req.response

        Deprecated members of Response:
        res.contentLength (use req.headersOut['Content-Length'])
        res.contentType (use req.headersOut['Content-Type'])

        The deprecated properties will be removed in the following
        releases.

    *) Feature: HTTP internalRedirect() method.

    Core:

    *) Bugfix: fixed heap-buffer-overflow in crypto.createHmac().

Changes with njs 0.2.1                                           31 May 2018

    nginx modules:

    *) Feature: HTTP request body getter.

    *) Improvement: moved njs vm to the main configuration.

    *) Improvement: improved logging for js_set and js_content directives.

    *) Improvement: setting status code to 500 by default in
       js_content handler.

    *) Improvement: added the debug for the returned status code in
       js_content.

    *) Bugfix: fixed error logging in js_include.

    Core:

    *) Feature: added array length setter.

    *) Improvement: public header cleanup. njscript.h is renamed to njs.h.

    *) Bugfix: fixed crypto update() method after digest() is called.

    *) Bugfix: fixed crypto.createHmac() for keys with size >= alg size
       and < 64.

    *) Bugfix: fixed JSON.stringify() for arrays with empty cells.

    *) Bugfix: fixed exception type for unsupported types in
       JSON.stringify().

    *) Bugfix: fixed handling of undefined arguments of functions.

    *) Bugfix: fixed handling of missing arg of
       Object.getOwnPropertyDescriptor().

    *) Bugfix: fixed handling of properties in
       Object.getOwnPropertyDescriptor().

    *) Bugfix: fixed the writeable flag of Array.length property.

    *) Bugfix: fixed return value type of clearTimeout().

    *) Bugfix: fixed njs_vm_external_bind().

    *) Bugfix: miscellaneous additional bugs have been fixed.

Changes with njs 0.2.0                                           3 Apr 2018

    *) Feature: reporting njs version by CLI.

    *) Feature: textual description for type converting exceptions.

    *) Feature: setTimeout() and clearTimeout() methods.

    *) Feature: Byte string to hex, base64, base64url encodings.

    *) Feature: Node.js style crypto methods.

    *) Feature: HTTP and stream warn() and error() methods.

    *) Feature: HTTP subrequest() method.

    *) Feature: HTTP return() method.

    *) Bugfix: miscellaneous bugs have been fixed in the core and
       interactive shell.

Changes with njs 0.1.15                                          20 Nov 2017

    *) Feature: Error, EvalError, InternalError, RangeError,
       ReferenceError, SyntaxError, TypeError, URIError objects.

    *) Feature: octal literals support.

    *) Feature: File system access fs.readFile(), fs.readFileSync(),
       fs.appendFile(),  fs.appendFileSync(), fs.writeFile(),
       fs.writeFileSync() methods.

    *) Feature: nginx modules print backtrace on exception.

    *) Bugfix: miscellaneous bugs have been fixed.

Changes with njs 0.1.14                                          09 Oct 2017

    *) Feature: JSON object.

    *) Feature: object level completions in interactive shell.

    *) Feature: various configure improvements.

    *) Bugfix: miscellaneous bugs have been fixed in the core and
       interactive shell.

Changes with njs 0.1.13                                          31 Aug 2017

    *) Feature: console.log() and console.help() methods in interactive
       shell.

    *) Feature: interactive shell prints backtrace on exception.

    *) Feature: interactive shell by default if libedit is available.

    *) Bugfix: processing of large files from stdin in command line mode.

    *) Bugfix: improved editline detection.

Changes with njs 0.1.12                                          08 Aug 2017

    *) Feature: Interactive shell.

    *) Bugfix: in Object.isSealed().

Changes with njs 0.1.11                                          27 Jun 2017

    *) Feature: Object.keys(), Object.prototype.hasOwnProperty() methods.

    *) Feature: Object.defineProperty(), Object.defineProperties(),
       Object.getOwnPropertyDescriptor() methods.

    *) Feature: Object.getPrototypeOf(), Object.prototype.isPrototypeOf()
       methods.

    *) Feature: Object.preventExtensions(), Object.isExtensible(),
       Object.freeze(), Object.isFrozen(), Object.seal(), Object.isSealed()
       methods.

    *) Feature: scientific notation literals support.

    *) Feature: hexadecimal literals support.

    *) Bugfix: processing of large array indexes.

    *) Bugfix: in parseInt() and Date.parse().

Changes with njs 0.1.10                                          04 Apr 2017

    *) Feature: nested functions and function closures.

    *) Feature: Array.of(), Array.prototype.fill(), Array.prototype.find(),
       Array.prototype.findIndex() methods.

    *) Bugfix: miscellaneous bugs and segmentation faults have been fixed.

Changes with njs 0.1.9                                           01 Feb 2017

    *) Bugfix: global variables were not initialized when njs was used
       in nginx.

Changes with njs 0.1.8                                           24 Jan 2017

    *) Change: the "strict" mode is enforced, variables must be explicitly
       declared.

    *) Feature: "for" and "for-in" loops support variable declaration.

    *) Bugfix: global and function scopes have been fixed.

    *) Bugfix: now "for-in" loop does not discard the last value of property
       variable.

    *) Bugfix: miscellaneous bugs and segmentation faults have been fixed.

Changes with njs 0.1.7                                           27 Dec 2016

    *) Change: the "js_include" directive has been disabled at server and
       location levels.

    *) Feature: exponentiation operators.

    *) Bugfix: miscellaneous bugs and segmentation faults have been fixed.

Changes with njs 0.1.6                                           13 Dec 2016

    *) Change: the "js_set" directive has been disabled at server and
       location levels.

    *) Feature: ES6 Math methods.

    *) Bugfix: miscellaneous bugs and segmentation faults have been fixed.

