Bump esbuild from 0.16.10 to 0.17.5

[dependabot]

Bumps esbuild from 0.16.10 to 0.17.5.

Release notes

Sourced from esbuild's releases.

v0.17.5

• Parse const type parameters from TypeScript 5.0

  The TypeScript 5.0 beta announcement adds const type parameters to the language. You can now add the const modifier on a type parameter of a function, method, or class like this:

  type HasNames = { names: readonly string[] };
  const getNamesExactly = <const T extends HasNames>(arg: T): T["names"] => arg.names;
  const names = getNamesExactly({ names: ["Alice", "Bob", "Eve"] });

  The type of names in the above example is readonly ["Alice", "Bob", "Eve"]. Marking the type parameter as const behaves as if you had written as const at every use instead. The above code is equivalent to the following TypeScript, which was the only option before TypeScript 5.0:

  type HasNames = { names: readonly string[] };
  const getNamesExactly = <T extends HasNames>(arg: T): T["names"] => arg.names;
  const names = getNamesExactly({ names: ["Alice", "Bob", "Eve"] } as const);

  You can read the announcement for more information.

• Make parsing generic async arrow functions more strict in .tsx files

  Previously esbuild's TypeScript parser incorrectly accepted the following code as valid:

  let fn = async <T> () => {};

  The official TypeScript parser rejects this code because it thinks it's the identifier async followed by a JSX element starting with <T>. So with this release, esbuild will now reject this syntax in .tsx files too. You'll now have to add a comma after the type parameter to get generic arrow functions like this to parse in .tsx files:

  let fn = async <T,> () => {};

• Allow the in and out type parameter modifiers on class expressions

  TypeScript 4.7 added the in and out modifiers on the type parameters of classes, interfaces, and type aliases. However, while TypeScript supported them on both class expressions and class statements, previously esbuild only supported them on class statements due to an oversight. This release now allows these modifiers on class expressions too:

  declare let Foo: any;
  Foo = class <in T> { };
  Foo = class <out T> { };

• Update enum constant folding for TypeScript 5.0

  TypeScript 5.0 contains an updated definition of what it considers a constant expression:

  An expression is considered a constant expression if it is

... (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

• a8b660d publish 0.17.5 to npm
• 0c3642e fix constant folding bug with nested operands
• be94d37 update enum constant folding for TypeScript 5.0
• 73523d9 parse const type parameters from TypeScript 5.0
• 3ada8f0 test coverage for async \<A, B> in typescript
• 8824778 tsx: reject generic arrow functions without a ,
• 1291b59 forbid definite assignment assertions on methods
• 71b3ef9 allow in and out with class expression params
• 3c83a84 publish 0.17.4 to npm
• 2252232 support replacing dot identifier names with inject
• Additional commits viewable in compare view

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[rajbos]

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