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Bump github.com/evanw/esbuild from 0.12.10 to 0.18.4 #404

Closed dependabot[bot] closed 1 year ago

dependabot[bot] commented 1 year ago

Bumps github.com/evanw/esbuild from 0.12.10 to 0.18.4.

Release notes

Sourced from github.com/evanw/esbuild's releases.

v0.18.4

  • Bundling no longer unnecessarily transforms class syntax (#1360, #1328, #1524, #2416)

    When bundling, esbuild automatically converts top-level class statements to class expressions. Previously this conversion had the unfortunate side-effect of also transforming certain other class-related syntax features to avoid correctness issues when the references to the class name within the class body. This conversion has been reworked to avoid doing this:

    // Original code
export class Foo {
  static foo = () => Foo
}

    // Old output (with --bundle)
var _Foo = class {
};
var Foo = _Foo;
__publicField(Foo, "foo", () => _Foo);
    

    // New output (with --bundle)
var Foo = class _Foo {
static foo = () => _Foo;
};

    This conversion process is very complicated and has many edge cases (including interactions with static fields, static blocks, private class properties, and TypeScript experimental decorators). It should already be pretty robust but a change like this may introduce new unintentional behavior. Please report any issues with this upgrade on the esbuild bug tracker.

    You may be wondering why esbuild needs to do this at all. One reason to do this is that esbuild's bundler sometimes needs to lazily-evaluate a module. For example, a module may end up being both the target of a dynamic import() call and a static import statement. Lazy module evaluation is done by wrapping the top-level module code in a closure. To avoid a performance hit for static import statements, esbuild stores top-level exported symbols outside of the closure and references them directly instead of indirectly.

    Another reason to do this is that multiple JavaScript VMs have had and continue to have performance issues with TDZ (i.e. "temporal dead zone") checks. These checks validate that a let, or const, or class symbol isn't used before it's initialized. Here are two issues with well-known VMs:

    JavaScriptCore had a severe performance issue as their TDZ implementation had time complexity that was quadratic in the number of variables needing TDZ checks in the same scope (with the top-level scope typically being the worst offender). V8 has ongoing issues with TDZ checks being present throughout the code their JIT generates even when they have already been checked earlier in the same function or when the function in question has already been run (so the checks have already happened).

    Due to esbuild's parallel architecture, esbuild both a) needs to convert class statements into class expressions during parsing and b) doesn't yet know whether this module will need to be lazily-evaluated or not in the parser. So esbuild always does this conversion during bundling in case it's needed for correctness (and also to avoid potentially catastrophic performance issues due to bundling creating a large scope with many TDZ variables).

  • Enforce TDZ errors in computed class property keys (#2045)

    JavaScript allows class property keys to be generated at run-time using code, like this:

    class Foo {
  static foo = 'foo'
  static [Foo.foo + '2'] = 2
}

    Previously esbuild treated references to the containing class name within computed property keys as a reference to the partially-initialized class object. That meant code that attempted to reference properties of the class object (such as the code above) would get back undefined instead of throwing an error.

    This release rewrites references to the containing class name within computed property keys into code that always throws an error at run-time, which is how this JavaScript code is supposed to work. Code that does this will now also generate a warning. You should never write code like this, but it now should be more obvious when incorrect code like this is written.

... (truncated)

Changelog

Sourced from github.com/evanw/esbuild's changelog.

Changelog: 2021

This changelog documents all esbuild versions published in the year 2021 (versions 0.8.29 through 0.14.10).

0.14.10

  • Enable tree shaking of classes with lowered static fields (#175)

    If the configured target environment doesn't support static class fields, they are converted into a call to esbuild's __publicField function instead. However, esbuild's tree-shaking pass treated this call as a side effect, which meant that all classes with static fields were ineligible for tree shaking. This release fixes the problem by explicitly ignoring calls to the __publicField function during tree shaking side-effect determination. Tree shaking is now enabled for these classes:

    // Original code
class Foo { static foo = 'foo' }
class Bar { static bar = 'bar' }
new Bar()

    // Old output (with --tree-shaking=true --target=es6)
class Foo {
}
__publicField(Foo, "foo", "foo");
class Bar {
}
__publicField(Bar, "bar", "bar");
new Bar();
    

    // New output (with --tree-shaking=true --target=es6)
class Bar {
}
__publicField(Bar, "bar", "bar");
new Bar();

  • Treat --define:foo=undefined as an undefined literal instead of an identifier (#1407)

    References to the global variable undefined are automatically replaced with the literal value for undefined, which appears as void 0 when printed. This allows for additional optimizations such as collapsing undefined ?? bar into just bar. However, this substitution was not done for values specified via --define:. As a result, esbuild could potentially miss out on certain optimizations in these cases. With this release, it's now possible to use --define: to substitute something with an undefined literal:

    // Original code
let win = typeof window !== 'undefined' ? window : {}

    // Old output (with --define:window=undefined --minify)
let win=typeof undefined!="undefined"?undefined:{};
    

    // New output (with --define:window=undefined --minify)
let win={};

  • Add the --drop:debugger flag (#1809)

    Passing this flag causes all debugger; statements to be removed from the output. This is similar to the drop_debugger: true flag available in the popular UglifyJS and Terser JavaScript minifiers.

... (truncated)

Commits
  • bfc5a0f publish 0.18.4 to npm
  • 5eb8f03 fix #3169: print negative properties as computed
  • 73ee85a overhaul esbuild's class transform (#3167)
  • 7bd06b0 fix function tree-shaking with --keep-names
  • b1887eb copy setup code to new ci job
  • f279568 ci: try type checking tsc using esbuild-built tsc
  • 1d3c0a1 use "inner class name" instead of "shadow name"
  • 9224cce publish 0.18.3 to npm
  • 35fd509 fix #3161: panic when minifying static {}
  • a7a9096 publish 0.18.2 to npm
  • Additional commits viewable in compare view


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dependabot[bot] commented 1 year ago

Superseded by #407.