v22.3.0

• 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.

v22.2.0

• 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().

v22.1.0

• 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.