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GraalVM JavaScript (Graal.js) Changelog

This changelog summarizes major changes between GraalVM versions of the GraalVM JavaScript (ECMAScript) language runtime. The main focus is on user-observable behavior of the engine. Changelog may include unreleased versions. See release calendar for release dates.

Version 24.1.0

Version 24.0.0

  • Implemented the WebAssembly threads proposal.
  • Implemented the Promise.withResolvers proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implementation of Async Iterator Helpers proposal (that was split out from Iterator Helpers proposal) was moved behind the experimental option --js.async-iterator-helpers.
  • Implemented the Well-Formed Unicode Strings proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the JSON.parse source text access proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Updated Node.js to version 18.18.2.
  • WebAssembly support in Node.js has been enabled by default. It can be disabled using the experimental option --js.webassembly=false.
  • --js.import-assertions option has been replaced by --js.import-attributes option because the corresponding proposal has migrated from the usage of assertions to the usage of attributes.

Version 23.1.0

  • NOTE: GraalVM no longer ships with a "js" ScriptEngine. Please either use the Maven dependency or explicitly put js-scriptengine.jar on the module path. See ScriptEngine documentation for details.
  • ECMAScript 2023 mode/features enabled by default.
  • Updated Node.js to version 18.17.1.
  • Implemented the Async Context proposal. It is available behind the experimental option --js.async-context.
  • FinalizationRegistry.prototype.cleanupSome is not enabled by default any more; it has been moved to ECMAScript staging mode (--js.ecmascript-version=staging).
  • Added an experimental option --js.allow-narrow-spaces-in-date-format (enabled by default). When this option is set to false then narrow spaces in date/time formats are replaced by a space (0x20).
  • Made option js.console stable and allowed in SandboxPolicy.UNTRUSTED.
  • Made option js.unhandled-rejections stable and allowed in SandboxPolicy.CONSTRAINED.
  • Added option js.allow-eval that is stable and allowed in SandboxPolicy.UNTRUSTED.
  • Deprecated option js.disable-eval, superseded by js.allow-eval.
  • Implemented the String.dedent proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Duplicate named capture groups are now supported in regular expressions, as per the duplicate named capturing groups proposal.
  • Implemented the RegExp v flag proposal. It is available behind the experimental option --js.regexp-unicode-sets.
  • The Maven coordinates for embedding the GraalVM JavaScript have been updated. For consuming the enterprise GraalVM JavaScript, use: 
    <dependency>
  <groupId>org.graalvm.polyglot</groupId>
  <artifactId>js</artifactId>
  <version>${graalvm.version}</version>
  <type>pom</type>
</dependency>
    For consuming the community GraalVM JavaScript, use: 
    <dependency>
  <groupId>org.graalvm.polyglot</groupId>
  <artifactId>js-community</artifactId>
  <version>${graalvm.version}</version>
  <type>pom</type>
</dependency>

Version 23.0.0

  • Implemented the WebAssembly reference types proposal.
  • Implemented the Iterator Helpers proposal. It is available behind the experimental option --js.iterator-helpers.
  • Implemented the ShadowRealm proposal. It is available behind the experimental option --js.shadow-realm.
  • Removed experimental option v8-legacy-const.
  • Removed non-standard SharedArrayBuffer.isView.
  • Updated Node.js to version 18.14.1.
  • Implemented the Symbols as WeakMap keys proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the ArrayBuffer.prototype.transfer and friends proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the Change Array by copy proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Added BigInteger interop support. Note that foreign BigIntegers require an explicit type cast using the BigInt function to opt into JS BigInt semantics. The default semantics is to treat all foreign numbers like JS Number values, regardless of the original value or type. Arithmetic operators perform an implicit lossy conversion to double; mixing a JS BigInt with any non-JS number always throws. Comparison operators attempt to do a precise value comparison where possible. JS BigInt values can now be converted to java.math.BigInteger host objects, although a target type mapping may still be necessary to ensure consistent type mapping if the target type is ambiguous or absent.

Version 22.3.0

  • Implemented the WebAssembly multi-value proposal.
  • Added an experimental option --js.unhandled-rejections=handler that allows to use a custom callback to track unhandled promise rejections.
  • Updated Node.js to version 16.17.1.
  • ECMA-402 Internationalization API has been enabled by default. It can be disabled by --js.intl-402=false option.
  • Implemented the Decorators (stage 3) proposal.

Version 22.2.0

  • GraalVM JavaScript is now an installable component of GraalVM. It can be installed with gu install js.
  • Enabled option js.foreign-object-prototype by default. Polyglot Interop objects now get a fitting JavaScript prototype assigned unless explicitly turned off using this flag.
  • Added intermediate prototype for foreign objects to simplify adapting functionality.
  • Removed deprecated experimental option experimental-foreign-object-prototype.
  • Removed experimental option commonjs-global-properties. The same functionality can be achieved in user code with a direct call to require() after context creation.
  • Added an experimental option --js.zone-rules-based-time-zones that allows to use timezone-related data from ZoneRulesProvider (instead of ICU4J data files).
  • Temporal objects can be converted to compatible Java objects when possible, using the Value API's methods like asDate().

Version 22.1.0

  • Updated Node.js to version 16.14.2.
  • Graal.js now requires Java 11+ and no longer supports Java 8.
  • Implemented the Intl.NumberFormat v3 proposal.
  • Implemented the Array Grouping v3 proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the Temporal proposal. It is available behind the experimental option --js.temporal.
  • Implemented the Array Find from Last proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Optimized closures to only keep references on variables in the lexical environment that are needed by (one or more) closures. This optimization can be disabled with the experimental option --js.scope-optimization=false.
  • Moved the internal string representation to the new TruffleString type.
  • Added option --js.string-lazy-substrings (default: true) to allow toggling the copying behavior of string slices. When enabled, string slices internally create string views instead of copying the given string region, which increases performance but may also increase memory utilization.

Version 22.0.0

  • ECMAScript 2022 mode/features enabled by default.
  • Implemented the Intl.DisplayNames v2 proposal.
  • Implemented the Intl Locale Info proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the Intl.DateTimeFormat.prototype.formatRange proposal.
  • Implemented the Extend TimeZoneName Option proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Implemented the Intl Enumeration API proposal. It is available in ECMAScript staging mode (--js.ecmascript-version=staging).
  • Updated Node.js to version 14.18.1.
  • Added option js.esm-bare-specifier-relative-lookup (default: false) to customize how bare specifiers for ES Modules are resolved. When disabled, bare specifiers are resolved with an absolute path lookup. When enabled, bare specifiers are resolved relative to the importing module's path.
  • ICU4J library moved to truffle.

Version 21.3.0

  • Implemented the Private Fields in in proposal. It is available behind the experimental option --js.private-fields-in.
  • Implemented the JavaScript BigInt to WebAssembly i64 integration proposal. It can be disabled using the --js.wasm-bigint=false option.
  • Updated Node.js to version 14.17.6.
  • Implemented the Error Cause proposal. It is available behind the experimental option --js.error-cause.
  • Implemented the Import Assertions proposal. It is available behind the experimental option --js.import-assertions.
  • Added support for collation option of Intl.Collator.
  • Added support for dayPeriod and fractionalSecondDigits options of Intl.DateTimeFormat.
  • Changed foreign hash map access using map[key] syntax to convert the key to a string or symbol.
  • Implemented Object.hasOwn (Accessible Object.hasOwnProperty proposal). It is available in ECMAScript 2022 (--js.ecmascript-version=2022).
  • Implemented class static initialization blocks proposal. It is available in ECMAScript 2022 (--js.ecmascript-version=2022).
  • Added experimental Polyglot Context option --js.esm-eval-returns-exports. When enabled, eval() of an ES module will return a Polyglot Value containing the ES module exported namespace object. The option is disabled by default.

Version 21.2.0

  • Graal.js now prints a warning when runtime compilation is not supported. This warning can be disabled using the '--engine.WarnInterpreterOnly=false' option or the '-Dpolyglot.engine.WarnInterpreterOnly=false' system property.
  • Added the js.unhandled-rejections option to track unhandled promise rejections in a polyglot Context. By default, the option is set to none, and unhandled promise rejections are not tracked.
  • Implemented the New Set Methods proposal. It is available behind an experimental flag (--js.new-set-methods).
  • Implemented experimental operator overloading support. Use the experimental option --js.operator-overloading to enable it and consult the documentation.
  • Updated RegExp Match Indices proposal with opt-in using the d flag. Available in ECMAScript 2022 (--js.ecmascript-version=2022). Deprecated --js.regexp-match-indices option.
  • Nashorn compatibility mode now defaults to compatiblity with ECMAScript version 5, unless another version is explicitly selected.
  • Date.prototype built-ins use ICU (not JDK) algorithms and data (like timezone data) by now (in order to reduce inconsistencies between Date and Intl.DateTimeFormat).
  • Updated ICU4J library to version 69.1.

Version 21.1.0

  • Updated Node.js to version 14.16.1.
  • Prototype of WebAssembly JavaScript Interface implemented. It is available behind the --js.webassembly flag.
  • Implemented iterator interop support, enabling foreign objects that have an iterator to be used where JS expects iterables, as well as JS iterables to be used in other languages and via the Value API.
  • Adopted new buffer interop support, allowing foreign buffers to be used with typed arrays and DataView, without copying. Likewise enables ArrayBuffer to be used in other languages.
  • Experimental option js.array-sort-inherited was removed. Values visible through holes in array(-like) object are always sorted according to the latest version of ECMAScript specification.
  • Updated ICU4J library to version 68.2.
  • Implemented the Atomics.waitAsync proposal. It is available in ECMAScript 2022 mode (--js.ecmascript-version=2022).
  • Implemented hash map interop support. Allows foreign hash maps to be iterated using for in/of loops, new Map(hash), Array.from(hash), etc. If the --js.foreign-hash-properties option is enabled (default), foreign hash maps can also be accessed using hash[key], hash.key, and used in {...hash}. If the --js.foreign-object-prototype option is enabled, foreign hash maps also have Map.prototype methods.
  • Moved GraalVM-Node.js to a separate installable component. In a GraalVM distribution it needs to be manually installed with $GRAALVM/bin/gu install nodejs.

Version 21.0.0

  • ECMAScript 2021 mode/features enabled by default.
  • Updated Node.js to version 12.20.1.
  • Adopted new interop exception handling and made JS exceptions extend AbstractTruffleException.
  • Implemented interop identity messages.
  • Expose Graal.versionECMAScript instead of Graal.versionJS.
  • Implemented the relative indexing method proposal. It is available in ECMAScript 2022 mode (--js.ecmascript-version=2022).

Version 20.3.0

  • Updated Node.js to version 12.18.4.
  • Fixed field/getter/setter access order in nashorn-compat mode, see issue #343.
  • ScriptEngine: Fixed "Multiple applicable overloads found" error in nashorn-compat mode, see issue #286.
  • ScriptEngine: Enabled low precedence lossy number, string-to-boolean, and number-to-boolean conversions in nashorn-compat mode.
  • Fixed Java.extend to respect HostAccess.Builder.allowImplementations, see issue #294.
  • Added Java host interop support for mapping JS objects to abstract classes (if HostAccess allows it).
  • js.foreign-object-prototype is a supported option to set JavaScript prototypes for foreign objects mimicing JavaScript types. It was renamed from js.experimental-foreign-object-prototype.
  • Changed ToPrimitive abstract operation to follow the specification for foreign objects. InteropLibrary.toDisplayString is not used by ToPrimitive/ToString conversions anymore.

Version 20.2.0

  • Implemented the Intl.NumberFormat Unified API proposal.
  • Implemented the Logical Assignment Operators proposal.
  • Implemented the Top-level Await proposal.
  • Implemented the Promise.any proposal. It is available in ECMAScript 2021 mode (--js.ecmascript-version=2021).
  • Implemented support for async stack traces.
  • Removed deprecation warning for flags previously passed via system properties.
  • Updated Node.js to version 12.18.0.
  • Updated ICU4J library to version 67.1
  • Fixed Date.toLocaleString and Intl.DateTimeFormat to use the context's default time zone rather than the system default if no explicit time zone is requested.
  • Improved js.timezone option to validate the time zone ID and support zone offsets like "-07:00".
  • Changed the === operator to treat foreign null values the same as JS null and use InteropLibrary.isIdentical for foreign objects.
  • Unified JSON parsing, providing more compatible error messages.

Version 20.1.0

  • ECMAScript 2020 mode/features enabled by default.
  • Implemented the Intl.DateTimeFormat dateStyle & timeStyle proposal.
  • Implemented the Intl.DisplayNames proposal.
  • Implemented the Intl.Locale proposal.
  • Implemented support for export * as ns from "mod". It is available in ECMAScript 2020 or later.
  • Implemented support for optional chaining (a?.b, a?.[b], a?.()). It is available in ECMAScript 2020 or later.
  • Implemented Nashorn extension Object.bindProperties(). It is available in Nashorn compatibility mode (--js.nashorn-compat).
  • Changed Polyglot.eval[File] to propagate syntax errors from the source language.
  • Changed Polyglot.import to return undefined for missing polyglot bindings.
  • Added npx (an npm package runner) into GraalVM.
  • Implemented the RegExp Match Indices proposal. It is available behind the --js.regexp-match-indices flag.
  • Removed the JOni RegExp-engine and the "use-tregex" option.
  • Implemented support for private class methods; available behind the --js.ecmascript-version=2021 flag.
  • Implemented the FinalizationRegistry proposal. It is available behind the --js.ecmascript-version=2021 flag.
  • Enabled the Hashbang Grammar proposal, by enabling the --js.shebang option by default in ECMAScript 2020 or later.
  • Updated ICU4J library to version 66.1.
  • Moved String.prototype.replaceAll to ECMAScript version 2021 (--js.ecmascript-version=2021).
  • Removed SIMD.js implementation.

Version 20.0.0

  • Implemented support for public and private class fields, both instance and static (based on the class fields and static class features proposals). This feature is available by default in Node.js and can be enabled using the experimental option js.class-fields.
  • Added option js.global-arguments (default: true) for the non-standard arguments global property (disabled in Node.js).
  • Updated Node.js to version 12.15.0.
  • Added name property to anonymous functions.
  • String.prototype.matchAll is available in ECMAScript 2020 mode (--js.ecmascript-version=2020) only.
  • Implemented the String.prototype.replaceAll proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Added js.load-from-classpath option to allow loading files from the classpath via classpath: pseudo URLs (disabled by default). Do not use with untrusted code.
  • Added option js.bind-member-functions for the implicit binding of unbound functions returned by Value.getMember to the receiver. The preferred way of calling members is using Value.invokeMember.
  • Added option js.commonjs-require to load Npm-compatible CommonJS modules from plain JavaScript. This is an experimental feature. See NodeJSVSJavaScriptContext.md for details.

Version 19.3.0

  • Implemented the Promise.allSettled proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Implemented the nullish coalescing proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Updated ICU4J library to version 64.2.
  • Updated ASM library to version 7.1.
  • Updated Node.js to version 12.10.0.
  • Disabled the non-standard global global property by default, which has been superseded by globalThis; use option js.global-property to reenable.
  • Disabled the non-standard performance global property by default except for the js launcher; use option js.performance to reenable.
  • Disabled the non-standard print and printErr functions in Node.js; use option js.print to reenable.

Version 19.2.0

  • Added support for date and time interop.
  • Added support for setting the time zone via Context.Builder.timeZone.
  • Implemented Numeric separators proposal. It is available in ECMAScript 2020 mode (--js.ecmascript-version=2020).
  • Moved ICU data previously distributed as separate files into the native image.
  • Added import.meta.url property.

Version 19.1.0

  • Added (experimental) option js.locale to set the default locale for locale-sensitive operations.
  • Allow making evaluated sources internal using the sourceURL directive by prefixing the URL with internal:, e.g. //# sourceURL=internal:myname.js.
  • Object.getOwnPropertyDescriptor(s) supported for non-JavaScript objects as well.
  • Enabled code sharing across threads using ContextPolicy.SHARED.

Version 19.0.0

  • Various bugfixes for compilation problems.

Version 1.0.0 RC16

  • provide js.load-from-url to allow loading from a URL.
  • provide js.bigint option to enable the BigInt proposal, available only in ECMAScript 2019 or later (enabled by default for those version, set to false to disable).

Version 1.0.0 RC15

  • Removed non-standard String.prototype.contains; use includes instead.
  • ScriptEngine: security-relevant Context-options are now disabled by default.
  • Migrated to Truffle Libraries for interop.
  • Polyglot builtin enabled based on Context.Builder.allowPolyglotAccess().
  • Added object rest and spread properties support for foreign objects.

Version 1.0.0 RC14

  • Option js.function-arguments-limit to set an upper bound for function arguments and argument spreading (default: 65535).
  • Support for HTML-like comments added.
  • Option js.experimental-array-prototype has been renamed to js.experimental-foreign-object-prototype. In addition to setting the prototype of array-like non-JS objects to Array.prototype it sets the prototype of executable non-JS objects to Function.prototype and the prototype of all other non-JS objects to Object.prototype.
  • --jvm.* and --native.* command line options are deprecated and replaced by --vm.* options
  • Implemented JSON superset proposal.

Version 1.0.0 RC13

  • Made Java interop available in native images. Note that you have to configure the accessible classes and methods at native image build time (see reflection configuration).
  • Removed deprecated experimental Java.Worker API. Node.js Workers should be used instead.
  • Removed deprecated NashornJavaInterop mode.
  • Object.fromEntries proposal implemented.
  • Implemented import() proposal.
  • Updated Node.js to version 10.15.2.

Version 1.0.0 RC12

  • Added option js.experimental-array-prototype that sets prototype of array-like non-JS objects (like ProxyArray or Java List) to Array.prototype. It is possible to use functions like map or forEach on these objects directly then.
  • Updated Node.js to version 10.15.0.
  • Added mime type application/javascript+module for ES module sources.
  • Changed the option name for the non-standard global property to js.global-property.

Version 1.0.0 RC11

  • Graal.js only supports ECMAScript 5 (ES5) and newer, and enforces that rule.
  • Added option js.disable-eval to enable eval() and similar methods of dynamic code evaluation (enabled by default, set to false to disable).
  • Added option js.disable-with to enable the with statement (enabled by default, set to false to disable).
  • Instrumentation: Extended inline parsing to support statements.
  • Added support for sharing Java objects using the experimental Node.js Worker Threads API.
  • Added support for ScriptEngine GLOBAL_SCOPE bindings.
  • Made Bindings created by ScriptEngine#createBindings() implement AutoCloseable to allow closing the underlying Context.
  • Do not provide Java builtin object when Java interop is disabled.
  • Added option js.print to enable the print and printErr builtins (enabled by default, set to false to disable).
  • Added option js.load to enable the load and loadWithNewGlobal builtins (enabled by default, set to false to disable).
  • Added option js.polyglot-builtin to enable the Polyglot builtins (enabled by default, set to false to disable).

Version 1.0.0 RC10

  • Added support for Array.prototype.{flat,flatMap}, a Stage 3 proposal.
  • Atomics.wake available under its new name (Atomics.notify) as well.
  • Well-formed JSON.stringify proposal implemented.
  • globalThis proposal implemented.
  • Added Java.addToClasspath(path) for adding jar files and directories to the host classpath dynamically.
  • Disabled non-standard global functions quit, read, readbuffer, and readline by default, except for the js launcher (js.shell option).
  • Disabled non-standard global functions readFully and readLine by default, now available only in Nashorn scripting mode (--js.scripting).
  • Disabled Nashorn syntax extensions by default (js.syntax-extensions option), barring ScriptEngine.
  • Note: As a result, eval requires function expressions to be parenthesized, e.g.: eval("(function(){...})") (not eval("function(){...}")).

Version 1.0.0 RC8

  • Provide simplified implementations for methods of the global console object even outside Node.js mode.
  • Updated Node.js to version 10.9.0.
  • Fix: Can construct Proxy(JavaType) and correctly reports as type function. Github #60.

Version 1.0.0 RC7

  • Improved support for sharing of shapes between Contexts with the same Engine.
  • Provide support for BigInteger TypedArrays, cf. ECMAScript BigInt proposal.
  • Extended instrumentation support to more types of interpreter nodes.

Version 1.0.0 RC6

  • Serialization API of v8/Node.js implemented.
  • Update version of Unicode to 11 in RegExp and Intl.
  • Implement Truffle file virtualization for JavaScript.
  • Support polyglot Truffle objects in Array.prototype.map et al and Array.prototype.sort.
  • Support for fuzzy time in performance.now() and Date.

Version 1.0.0 RC5

  • Add support for Symbol.prototype.description, a Stage 3 proposal.
  • Add support for String.prototype.matchAll, a Stage 3 proposal.
  • Implement optional catch binding proposal, targeted for ES2019.
  • Removed legacy NashornExtensions option, use --js.nashorn-compat instead.
  • Provide Java package globals by default.

Version 1.0.0 RC4

  • Added stack trace limit option (--js.stack-trace-limit).
  • Enable SharedArrayBuffers by default.
  • Provide $EXEC for Nashorn compatibility in scripting mode.
  • Provide Java.isScriptFunction, Java.isScriptObject, Java.isJavaMethod, and Java.isJavaFunction in Nashorn compatibility mode.
  • Provide support to access getters and setters like a field, in Nashorn compatibility mode.
  • Provide top-level package globals in Nashorn compatibility mode: java, javafx, javax, com, org, edu.
  • Provide Java.extend, Java.super, and new Interface|AbstractClass(fn|obj) in Nashorn compatibility mode.
  • Provide java.lang.String methods on string values, in Nashorn compatibility mode.
  • Provide JavaImporter class in Nashorn compatibility mode.
  • Provide JSAdapter class only in Nashorn compatibility mode.

Version 1.0.0 RC3

  • Added support for BigInt arithmetic expressions.
  • Provide a flag for a Nashorn compatibility mode (--js.nashorn-compat).
  • Rename flag for V8 compatibility mode (to --js.v8-compat).

Version 1.0.0 RC2

  • Enabled code sharing between Contexts with the same Engine.
  • Updated Node.js to version 8.11.1.

Version 1.0.0 RC1

  • LICENSE set to The Universal Permissive License (UPL), Version 1.0.

Version 0.33

  • Added object rest/spread support.
  • Added support for async generators.
  • Unified Polyglot primitives across all Truffle languages; e.g., rename Interop builtin to Polyglot.