Closure Compiler v20230802 released

[Hana Joo]

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

August, 02, 2023 (v20230802)
*  RemoveUnusedCode will now generate an "unremovable.log" file when debug logging is enabled. It contains a line for each non-removed variable stating why it could not be removed.
* Improve constant inference in BanElementSetAttribute
* Removed support for referencing goog.module exports or local variables by the compiler-mangled name in JSDoc, e.g. @type {!module$exports$foo}. Use goog.require/goog.requireType instead.
* Add support for the @pureOrBreakMyCode jsdoc annotation in the  RemoveUnusedCode pass to help it decide if side effects can be removed.
* Update the latestEcmaScript in JSCompiler config to return ES2021 Respect constantness indicated by @const when checking setAttribuite violations.
* Add ReplaceToggles pass, which replaces calls to goog.toggle(num) with a direct lookup on the goog.TOGGLES_ bitset.
* Make custom conformance rules match optional types. 
* Fixes a crash when the RHS of a string key was an object pattern, e.g.
let {["x"]:{["y"]:bar}}={["x"]:{["y"]:"foo"}}
            ^^^^^^^^^
               crashes when turning this into a string key, i.e.
                 {y:bar}
* Node.JS externs: Add optional second arg to fs.readdirSync
* Certain redeclarations that were previously warnings are now errors.
{ var x; function x() {}; }
In this example, the redeclaration of x as a function was treated as a warning, only to later break inlining. It is now (correctly) treated as an error.

* Deleted TransformAMDToCJSModule.java and associated logic. We have not been maintaining this pass and believe it is unused.
* Elide function name when inlining function declaration variables. For example:
    function foo() { /* function impl not using foo */ }
    exports.bar = foo;
when inlined will now become
    exports.bar = function() {...}
* Fix a bug in RemoveUnusedCode that was previously too aggressive when encountering unused members inside object destructuring with object rest.
* Fix bug where code printer omitted parentheses around some arrow functions in casts and produced syntactically invalid code. This bug only affected certain builds that don't run optimizations, e.g. a build using "transpileOnly" mode and producing ES2019.

* Fixed crash when transpiling down to ES5 a let/const variable that is a) defined within a loop and b) referenced in an object literal getter or setter in that loop. (https://github.com/google/closure-compiler/issues/3599)
* Modified Compiler Java API so that it's no longer necessary to call compiler.parse() after compiler.initWithTypedAstFilesystem or compiler.initModulesWithTypedAstFilesystem

* Improved type inference of goog.requires and Symbol('') calls in some edge cases.