Closure Compiler v20210406 Released!

[Ben Lickly]

Downloads:

Maven: http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22closure-compiler%22

NPM: https://www.npmjs.com/package/google-closure-compiler

Release Notes:

https://github.com/google/closure-compiler/wiki/Releases

April 6, 2021 (v20210406)

• Remove the ability to select specific strings to alias from the compiler API.
• Enable trailing commas in arrow function parameter lists as allowed in the language spec: https://tc39.es/ecma262/#prod-CoverParenthesizedExpressionAndArrowParameterList
• Add --dynamic_import_alias option which instructs the compiler to replace dynamic import expressions with a function call using the specified name. This allows dynamic import expressions to be externally polyfilled when the output language level does not natively support them.
• Properly report a parse error for functions that have trailing commas after rest parameters.
• In the AliasString pass remove support for skipping certain strings based on whether they match a supplied regex.
• For AliasString pass, rather than using the source location of the file that aliased strings are added to, use instead the first original use location. This will prevent the first file of affected chucks from being artificially bloated when using source maps to determine "weight" of input source on the output.
• The BanGlobalVars conformance rule now accepts specific variables names to allowlist via the value field.
• Stricten validation of goog. module ids to match closure/base.js. Only ASCII, _, $, and 0-9 are now allowed.
• Add linter warning for using extends keyword in @interface/@records definition.
• Refactoring of compiler handling of goog.define: tooling using checksOnly will now see the original source's goog.define('name', 0); instead being rewritten to the default value 0
• Implement decomposition of super.method() calls in ExpressionDecomposer. This fixed a compiler crash that could occur when inlining a function call into the arguments of a super.method() call.
• Fixed enableMultistageCompilation() option in CompilerTestCase API to work again, and also run multistage compilation if enableNormalize() is on.
• Fixes to optimizations of 'class side inhertiance', including small fixes to make optimizations both safer and more consistent.