CHANGES

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.