Fix glob imports in TypeScript files (#3319)

This release fixes a problem where bundling a TypeScript file containing a glob import could emit a call to a helper function that doesn't exist. The problem happened because esbuild's TypeScript transformation removes unused imports (which is required for correctness, as they may be type-only imports) and esbuild's glob import transformation wasn't correctly marking the imported helper function as used. This wasn't caught earlier because most of esbuild's glob import tests were written in JavaScript, not in TypeScript.

Fix require() glob imports with bundling disabled (#3546)

Previously require() calls containing glob imports were incorrectly transformed when bundling was disabled. All glob imports should only be transformed when bundling is enabled. This bug has been fixed.

Fix a panic when transforming optional chaining with define (#3551, #3554)

This release fixes a case where esbuild could crash with a panic, which was triggered by using define to replace an expression containing an optional chain. Here is an example:

// Original code
console.log(process?.env.SHELL)

// Old output (with --define:process.env={})
/* panic: Internal error (while parsing "<stdin>") */

// New output (with --define:process.env={})
var define_process_env_default = {};
console.log(define_process_env_default.SHELL);

This fix was contributed by @hi-ogawa.

Work around a bug in node's CommonJS export name detector (#3544)

The export names of a CommonJS module are dynamically-determined at run time because CommonJS exports are properties on a mutable object. But the export names of an ES module are statically-determined at module instantiation time by using import and export syntax and cannot be changed at run time.

When you import a CommonJS module into an ES module in node, node scans over the source code to attempt to detect the set of export names that the CommonJS module will end up using. That statically-determined set of names is used as the set of names that the ES module is allowed to import at module instantiation time. However, this scan appears to have bugs (or at least, can cause false positives) because it doesn't appear to do any scope analysis. Node will incorrectly consider the module to export something even if the assignment is done to a local variable instead of to the module-level exports object. For example:

// confuseNode.js
exports.confuseNode = function(exports) {
  // If this local is called "exports", node incorrectly
  // thinks this file has an export called "notAnExport".
  exports.notAnExport = function() {
  };
};

You can see that node incorrectly thinks the file confuseNode.js has an export called notAnExport when that file is loaded in an ES module context:

$ node -e 'import("./confuseNode.js").then(console.log)'
[Module: null prototype] {
  confuseNode: [Function (anonymous)],
  default: { confuseNode: [Function (anonymous)] },
  notAnExport: undefined
}

To avoid this, esbuild will now rename local variables that use the names exports and module when generating CommonJS output for the node platform.

Fix the return value of esbuild's super() shim (#3538)

Some people write constructor methods that use the return value of super() instead of using this. This isn't too common because TypeScript doesn't let you do that but it can come up when writing JavaScript. Previously esbuild's class lowering transform incorrectly transformed the return value of super() into undefined. With this release, the return value of super() will now be this instead:

// Original code
class Foo extends Object {
  field
  constructor() {
    console.log(typeof super())
  }
}
new Foo

// Old output (with --target=es6)
class Foo extends Object {
  constructor() {
    var __super = (...args) => {
      super(...args);
      __publicField(this, "field");
    };
    console.log(typeof __super());
  }
}
new Foo();

// New output (with --target=es6)
class Foo extends Object {
  constructor() {
    var __super = (...args) => {
      super(...args);
      __publicField(this, "field");
      return this;
    };
    console.log(typeof __super());
  }
}
new Foo();

Terminate the Go GC when esbuild's stop() API is called (#3552)

If you use esbuild with WebAssembly and pass the worker: false flag to esbuild.initialize(), then esbuild will run the WebAssembly module on the main thread. If you do this within a Deno test and that test calls esbuild.stop() to clean up esbuild's resources, Deno may complain that a setTimeout() call lasted past the end of the test. This happens when the Go is in the middle of a garbage collection pass and has scheduled additional ongoing garbage collection work. Normally calling esbuild.stop() will terminate the web worker that the WebAssembly module runs in, which will terminate the Go GC, but that doesn't happen if you disable the web worker with worker: false.

With this release, esbuild will now attempt to terminate the Go GC in this edge case by calling clearTimeout() on these pending timeouts.

Apply /* @__NO_SIDE_EFFECTS__ */ on tagged template literals (#3511)

Tagged template literals that reference functions annotated with a @__NO_SIDE_EFFECTS__ comment are now able to be removed via tree-shaking if the result is unused. This is a convention from Rollup. Here is an example:

// Original code
const html = /* @__NO_SIDE_EFFECTS__ */ (a, ...b) => ({ a, b })
html`<a>remove</a>`
x = html`<b>keep</b>`

// Old output (with --tree-shaking=true)
const html = /* @__NO_SIDE_EFFECTS__ */ (a, ...b) => ({ a, b });
html`<a>remove</a>`;
x = html`<b>keep</b>`;

// New output (with --tree-shaking=true)
const html = /* @__NO_SIDE_EFFECTS__ */ (a, ...b) => ({ a, b });
x = html`<b>keep</b>`;

Note that this feature currently only works within a single file, so it's not especially useful. This feature does not yet work across separate files. I still recommend using @__PURE__ annotations instead of this feature, as they have wider tooling support. The drawback of course is that @__PURE__ annotations need to be added at each call site, not at the declaration, and for non-call expressions such as template literals you need to wrap the expression in an IIFE (immediately-invoked function expression) to create a call expression to apply the @__PURE__ annotation to.

Publish builds for IBM AIX PowerPC 64-bit (#3549)

This release publishes a binary executable to npm for IBM AIX PowerPC 64-bit, which means that in theory esbuild can now be installed in that environment with npm install esbuild. This hasn't actually been tested yet. If you have access to such a system, it would be helpful to confirm whether or not doing this actually works.

Fix a regression in 0.19.0 regarding paths in tsconfig.json (#3354)

The fix in esbuild version 0.19.0 to process tsconfig.json aliases before the --packages=external setting unintentionally broke an edge case in esbuild's handling of certain tsconfig.json aliases where there are multiple files with the same name in different directories. This release adjusts esbuild's behavior for this edge case so that it passes while still processing aliases before --packages=external. Please read the linked issue for more details.

Fix a CSS font property minification bug (#3452)

This release fixes a bug where esbuild's CSS minifier didn't insert a space between the font size and the font family in the font CSS shorthand property in the edge case where the original source code didn't already have a space and the leading string token was shortened to an identifier:

/* Original code */
.foo { font: 16px"Menlo"; }

/* Old output (with --minify) */
.foo{font:16pxMenlo}

/* New output (with --minify) */
.foo{font:16px Menlo}

Fix bundling CSS with asset names containing spaces (#3410)

Assets referenced via CSS url() tokens may cause esbuild to generate invalid output when bundling if the file name contains spaces (e.g. url(image 2.png)). With this release, esbuild will now quote all bundled asset references in url() tokens to avoid this problem. This only affects assets loaded using the file and copy loaders.

Fix invalid CSS url() tokens in @import rules (#3426)

In the future, CSS url() tokens may contain additional stuff after the URL. This is irrelevant today as no CSS specification does this. But esbuild previously had a bug where using these tokens in an @import rule resulted in malformed output. This bug has been fixed.

Fix browser + false + type: module in package.json (#3367)

The browser field in package.json allows you to map a file to false to have it be treated as an empty file when bundling for the browser. However, if package.json contains "type": "module" then all .js files will be considered ESM, not CommonJS. Importing a named import from an empty CommonJS file gives you undefined, but importing a named export from an empty ESM file is a build error. This release changes esbuild's interpretation of these files mapped to false in this situation from ESM to CommonJS to avoid generating build errors for named imports.

Fix a bug in top-level await error reporting (#3400)

Using require() on a file that contains top-level await is not allowed because require() must return synchronously and top-level await makes that impossible. You will get a build error if you try to bundle code that does this with esbuild. This release fixes a bug in esbuild's error reporting code for complex cases of this situation involving multiple levels of imports to get to the module containing the top-level await.

Update to Unicode 15.1.0

The character tables that determine which characters form valid JavaScript identifiers have been updated from Unicode version 15.0.0 to the newly-released Unicode version 15.1.0. I'm not putting an example in the release notes because all of the new characters will likely just show up as little squares since fonts haven't been updated yet. But you can read https://www.unicode.org/versions/Unicode15.1.0/#Summary for more information about the changes.

This upgrade was contributed by @JLHwung.

Fix printing of JavaScript decorators in tricky cases (#3396)

This release fixes some bugs where esbuild's pretty-printing of JavaScript decorators could incorrectly produced code with a syntax error. The problem happened because esbuild sometimes substitutes identifiers for other expressions in the pretty-printer itself, but the decision about whether to wrap the expression or not didn't account for this. Here are some examples:

// Original code
import { constant } from './constants.js'
import { imported } from 'external'
import { undef } from './empty.js'
class Foo {
  @constant()
  @imported()
  @undef()
  foo
}

// Old output (with --bundle --format=cjs --packages=external --minify-syntax)
var import_external = require("external");
var Foo = class {
  @123()
  @(0, import_external.imported)()
  @(void 0)()
  foo;
};

// New output (with --bundle --format=cjs --packages=external --minify-syntax)
var import_external = require("external");
var Foo = class {
  @(123())
  @((0, import_external.imported)())
  @((void 0)())
  foo;
};

Allow pre-release versions to be passed to target (#3388)

People want to be able to pass version numbers for unreleased versions of node (which have extra stuff after the version numbers) to esbuild's target setting and have esbuild do something reasonable with them. These version strings are of course not present in esbuild's internal feature compatibility table because an unreleased version has not been released yet (by definition). With this release, esbuild will now attempt to accept these version strings passed to target and do something reasonable with them.

Update how CSS nesting is parsed again

CSS nesting syntax has been changed again, and esbuild has been updated to match. Type selectors may now be used with CSS nesting:

.foo {
  div {
    color: red;
  }
}

Previously this was disallowed in the CSS specification because it's ambiguous whether an identifier is a declaration or a nested rule starting with a type selector without requiring unbounded lookahead in the parser. It has now been allowed because the CSS working group has decided that requiring unbounded lookahead is acceptable after all.

Note that this change means esbuild no longer considers any existing browser to support CSS nesting since none of the existing browsers support this new syntax. CSS nesting will now always be transformed when targeting a browser. This situation will change in the future as browsers add support for this new syntax.

Fix a scope-related bug with --drop-labels= (#3311)

The recently-released --drop-labels= feature previously had a bug where esbuild's internal scope stack wasn't being restored properly when a statement with a label was dropped. This could manifest as a tree-shaking issue, although it's possible that this could have also been causing other subtle problems too. The bug has been fixed in this release.

Make renamed CSS names unique across entry points (#3295)

Previously esbuild's generated names for local names in CSS were only unique within a given entry point (or across all entry points when code splitting was enabled). That meant that building multiple entry points with esbuild could result in local names being renamed to the same identifier even when those entry points were built simultaneously within a single esbuild API call. This problem was especially likely to happen with minification enabled. With this release, esbuild will now avoid renaming local names from two separate entry points to the same name if those entry points were built with a single esbuild API call, even when code splitting is disabled.

Fix CSS ordering bug with @layer before @import

CSS lets you put @layer rules before @import rules to define the order of layers in a stylesheet. Previously esbuild's CSS bundler incorrectly ordered these after the imported files because before the introduction of cascade layers to CSS, imported files could be bundled by removing the @import rules and then joining files together in the right order. But with @layer, CSS files may now need to be split apart into multiple pieces in the bundle. For example:

/* Original code */
@layer start;
@import "data:text/css,@layer inner.start;";
@import "data:text/css,@layer inner.end;";
@layer end;

/* Old output (with --bundle) */
@layer inner.start;
@layer inner.end;
@layer start;
@layer end;

/* New output (with --bundle) */
@layer start;
@layer inner.start;
@layer inner.end;
@layer end;

Unwrap nested duplicate @media rules (#3226)

With this release, esbuild's CSS minifier will now automatically unwrap duplicate nested @media rules:

/* Original code */
@media (min-width: 1024px) {
  .foo { color: red }
  @media (min-width: 1024px) {
    .bar { color: blue }
  }
}

/* Old output (with --minify) */
@media (min-width: 1024px){.foo{color:red}@media (min-width: 1024px){.bar{color:#00f}}}

/* New output (with --minify) */
@media (min-width: 1024px){.foo{color:red}.bar{color:#00f}}

These rules are unlikely to be authored manually but may result from using frameworks such as Tailwind to generate CSS.