build(deps-dev): bump esbuild from 0.15.7 to 0.18.6

[dependabot]

Bumps esbuild from 0.15.7 to 0.18.6.

Release notes

Sourced from esbuild's releases.

v0.18.6

• Fix tree-shaking of classes with decorators (#3164)

  This release fixes a bug where esbuild incorrectly allowed tree-shaking on classes with decorators. Each decorator is a function call, so classes with decorators must never be tree-shaken. This bug was a regression that was unintentionally introduced in version 0.18.2 by the change that enabled tree-shaking of lowered private fields. Previously decorators were always lowered, and esbuild always considered the automatically-generated decorator code to be a side effect. But this is no longer the case now that esbuild analyzes side effects using the AST before lowering takes place. This bug was fixed by considering any decorator a side effect.

• Fix a minification bug involving function expressions (#3125)

  When minification is enabled, esbuild does limited inlining of const symbols at the top of a scope. This release fixes a bug where inlineable symbols were incorrectly removed assuming that they were inlined. They may not be inlined in cases where they were referenced by earlier constants in the body of a function expression. The declarations involved in these edge cases are now kept instead of being removed:

  // Original code
  {
    const fn = () => foo
    const foo = 123
    console.log(fn)
  }
  // Old output (with --minify-syntax)
  console.log((() => foo)());
  // New output (with --minify-syntax)
  {
  const fn = () => foo, foo = 123;
  console.log(fn);
  }

v0.18.5

• Implement auto accessors (#3009)

  This release implements the new auto-accessor syntax from the upcoming JavaScript decorators proposal. The auto-accessor syntax looks like this:

  class Foo {
    accessor foo;
    static accessor bar;
  }
  new Foo().foo = Foo.bar;

  This syntax is not yet a part of JavaScript but it was added to TypeScript in version 4.9. More information about this feature can be found in microsoft/TypeScript#49705. Auto-accessors will be transformed if the target is set to something other than esnext:

  // Output (with --target=esnext)
  class Foo {
    accessor foo;
    static accessor bar;
  }
  new Foo().foo = Foo.bar;

... (truncated)

Changelog

Sourced from esbuild's changelog.

Changelog: 2022

This changelog documents all esbuild versions published in the year 2022 (versions 0.14.11 through 0.16.12).

0.16.12

• Loader defaults to js for extensionless files (#2776)

  Certain packages contain files without an extension. For example, the yargs package contains the file yargs/yargs which has no extension. Node, Webpack, and Parcel can all understand code that imports yargs/yargs because they assume that the file is JavaScript. However, esbuild was previously unable to understand this code because it relies on the file extension to tell it how to interpret the file. With this release, esbuild will now assume files without an extension are JavaScript files. This can be customized by setting the loader for "" (the empty string, representing files without an extension) to another loader. For example, if you want files without an extension to be treated as CSS instead, you can do that like this:

  • CLI:

    esbuild --bundle --loader:=css
    

  • JS:

    esbuild.build({
      bundle: true,
      loader: { '': 'css' },
    })

  • Go:

    api.Build(api.BuildOptions{
      Bundle: true,
      Loader: map[string]api.Loader{"": api.LoaderCSS},
    })

  In addition, the "type" field in package.json files now only applies to files with an explicit .js, .jsx, .ts, or .tsx extension. Previously it was incorrectly applied by esbuild to all files that had an extension other than .mjs, .mts, .cjs, or .cts including extensionless files. So for example an extensionless file in a "type": "module" package is now treated as CommonJS instead of ESM.

0.16.11

• Avoid a syntax error in the presence of direct eval (#2761)

  The behavior of nested function declarations in JavaScript depends on whether the code is run in strict mode or not. It would be problematic if esbuild preserved nested function declarations in its output because then the behavior would depend on whether the output was run in strict mode or not instead of respecting the strict mode behavior of the original source code. To avoid this, esbuild transforms nested function declarations to preserve the intended behavior of the original source code regardless of whether the output is run in strict mode or not:

  // Original code
  if (true) {
    function foo() {}
    console.log(!!foo)
    foo = null
    console.log(!!foo)
  }

... (truncated)

Commits

• f0b5803 publish 0.18.6 to npm
• 25a3963 fix #3125: bug with constant inlining and closures
• ddda7a8 prevent await using when await is unsupported
• 09394ba fixes and tests for for (using of x) edge case
• 1634a0b initial support for await using declarations
• ac5a078 make js decorator parsing more restrictive
• d565272 fix #3164: decorators must prevent tree-shaking
• 56a3e01 initial support for using declarations
• 931be1b publish 0.18.5 to npm
• d46e491 fix #3009: release notes for auto-accessor support
• Additional commits viewable in compare view

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[dependabot]

Superseded by #268.