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This PR contains the following updates:
0.21.1->0.21.5Release Notes
evanw/esbuild (esbuild)
### [`v0.21.5`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0215) [Compare Source](https://togithub.com/evanw/esbuild/compare/v0.21.4...v0.21.5) - Fix `Symbol.metadata` on classes without a class decorator ([#3781](https://togithub.com/evanw/esbuild/issues/3781)) This release fixes a bug with esbuild's support for the [decorator metadata proposal](https://togithub.com/tc39/proposal-decorator-metadata). Previously esbuild only added the `Symbol.metadata` property to decorated classes if there was a decorator on the class element itself. However, the proposal says that the `Symbol.metadata` property should be present on all classes that have any decorators at all, not just those with a decorator on the class element itself. - Allow unknown import attributes to be used with the `copy` loader ([#3792](https://togithub.com/evanw/esbuild/issues/3792)) Import attributes (the `with` keyword on `import` statements) are allowed to alter how that path is loaded. For example, esbuild cannot assume that it knows how to load `./bagel.js` as type `bagel`: ```js // This is an error with "--bundle" without also using "--external:./bagel.js" import tasty from "./bagel.js" with { type: "bagel" } ``` Because of that, bundling this code with esbuild is an error unless the file `./bagel.js` is external to the bundle (such as with `--bundle --external:./bagel.js`). However, there is an additional case where it's ok for esbuild to allow this: if the file is loaded using the `copy` loader. That's because the `copy` loader behaves similarly to `--external` in that the file is left external to the bundle. The difference is that the `copy` loader copies the file into the output folder and rewrites the import path while `--external` doesn't. That means the following will now work with the `copy` loader (such as with `--bundle --loader:.bagel=copy`): ```js // This is no longer an error with "--bundle" and "--loader:.bagel=copy" import tasty from "./tasty.bagel" with { type: "bagel" } ``` - Support import attributes with glob-style imports ([#3797](https://togithub.com/evanw/esbuild/issues/3797)) This release adds support for import attributes (the `with` option) to glob-style imports (dynamic imports with certain string literal patterns as paths). These imports previously didn't support import attributes due to an oversight. So code like this will now work correctly: ```ts async function loadLocale(locale: string): Locale { const data = await import(`./locales/${locale}.data`, { with: { type: 'json' } }) return unpackLocale(locale, data) } ``` Previously this didn't work even though esbuild normally supports forcing the JSON loader using an import attribute. Attempting to do this used to result in the following error: ✘ [ERROR] No loader is configured for ".data" files: locales/en-US.data example.ts:2:28: 2 │ const data = await import(`./locales/${locale}.data`, { with: { type: 'json' } }) ╵ ~~~~~~~~~~~~~~~~~~~~~~~~~~ In addition, this change means plugins can now access the contents of `with` for glob-style imports. - Support `${configDir}` in `tsconfig.json` files ([#3782](https://togithub.com/evanw/esbuild/issues/3782)) This adds support for a new feature from the upcoming TypeScript 5.5 release. The character sequence `${configDir}` is now respected at the start of `baseUrl` and `paths` values, which are used by esbuild during bundling to correctly map import paths to file system paths. This feature lets base `tsconfig.json` files specified via `extends` refer to the directory of the top-level `tsconfig.json` file. Here is an example: ```json { "compilerOptions": { "paths": { "js/*": ["${configDir}/dist/js/*"] } } } ``` You can read more in [TypeScript's blog post about their upcoming 5.5 release](https://devblogs.microsoft.com/typescript/announcing-typescript-5-5-rc/#the-configdir-template-variable-for-configuration-files). Note that this feature does not make use of template literals (you need to use `"${configDir}/dist/js/*"` not `` `${configDir}/dist/js/*` ``). The syntax for `tsconfig.json` is still just JSON with comments, and JSON syntax does not allow template literals. This feature only recognizes `${configDir}` in strings for certain path-like properties, and only at the beginning of the string. - Fix internal error with `--supported:object-accessors=false` ([#3794](https://togithub.com/evanw/esbuild/issues/3794)) This release fixes a regression in 0.21.0 where some code that was added to esbuild's internal runtime library of helper functions for JavaScript decorators fails to parse when you configure esbuild with `--supported:object-accessors=false`. The reason is that esbuild introduced code that does `{ get [name]() {} }` which uses both the `object-extensions` feature for the `[name]` and the `object-accessors` feature for the `get`, but esbuild was incorrectly only checking for `object-extensions` and not for `object-accessors`. Additional tests have been added to avoid this type of issue in the future. A workaround for this issue in earlier releases is to also add `--supported:object-extensions=false`. ### [`v0.21.4`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0214) [Compare Source](https://togithub.com/evanw/esbuild/compare/v0.21.3...v0.21.4) - Update support for import assertions and import attributes in node ([#3778](https://togithub.com/evanw/esbuild/issues/3778)) Import assertions (the `assert` keyword) have been removed from node starting in v22.0.0. So esbuild will now strip them and generate a warning with `--target=node22` or above: ▲ [WARNING] The "assert" keyword is not supported in the configured target environment ("node22") [assert-to-with] example.mjs:1:40: 1 │ import json from "esbuild/package.json" assert { type: "json" } │ ~~~~~~ ╵ with Did you mean to use "with" instead of "assert"? Import attributes (the `with` keyword) have been backported to node 18 starting in v18.20.0. So esbuild will no longer strip them with `--target=node18.N` if `N` is 20 or greater. - Fix `for await` transform when a label is present This release fixes a bug where the `for await` transform, which wraps the loop in a `try` statement, previously failed to also move the loop's label into the `try` statement. This bug only affects code that uses both of these features in combination. Here's an example of some affected code: ```js // Original code async function test() { outer: for await (const x of [Promise.resolve([0, 1])]) { for (const y of x) if (y) break outer throw 'fail' } } // Old output (with --target=es6) function test() { return __async(this, null, function* () { outer: try { for (var iter = __forAwait([Promise.resolve([0, 1])]), more, temp, error; more = !(temp = yield iter.next()).done; more = false) { const x = temp.value; for (const y of x) if (y) break outer; throw "fail"; } } catch (temp) { error = [temp]; } finally { try { more && (temp = iter.return) && (yield temp.call(iter)); } finally { if (error) throw error[0]; } } }); } // New output (with --target=es6) function test() { return __async(this, null, function* () { try { outer: for (var iter = __forAwait([Promise.resolve([0, 1])]), more, temp, error; more = !(temp = yield iter.next()).done; more = false) { const x = temp.value; for (const y of x) if (y) break outer; throw "fail"; } } catch (temp) { error = [temp]; } finally { try { more && (temp = iter.return) && (yield temp.call(iter)); } finally { if (error) throw error[0]; } } }); } ``` - Do additional constant folding after cross-module enum inlining ([#3416](https://togithub.com/evanw/esbuild/issues/3416), [#3425](https://togithub.com/evanw/esbuild/issues/3425)) This release adds a few more cases where esbuild does constant folding after cross-module enum inlining. ```ts // Original code: enum.ts export enum Platform { WINDOWS = 'windows', MACOS = 'macos', LINUX = 'linux', } // Original code: main.ts import { Platform } from './enum'; declare const PLATFORM: string; export function logPlatform() { if (PLATFORM == Platform.WINDOWS) console.log('Windows'); else if (PLATFORM == Platform.MACOS) console.log('macOS'); else if (PLATFORM == Platform.LINUX) console.log('Linux'); else console.log('Other'); } // Old output (with --bundle '--define:PLATFORM="macos"' --minify --format=esm) function n(){"windows"=="macos"?console.log("Windows"):"macos"=="macos"?console.log("macOS"):"linux"=="macos"?console.log("Linux"):console.log("Other")}export{n as logPlatform}; // New output (with --bundle '--define:PLATFORM="macos"' --minify --format=esm) function n(){console.log("macOS")}export{n as logPlatform}; ``` - Pass import attributes to on-resolve plugins ([#3384](https://togithub.com/evanw/esbuild/issues/3384), [#3639](https://togithub.com/evanw/esbuild/issues/3639), [#3646](https://togithub.com/evanw/esbuild/issues/3646)) With this release, on-resolve plugins will now have access to the import attributes on the import via the `with` property of the arguments object. This mirrors the `with` property of the arguments object that's already passed to on-load plugins. In addition, you can now pass `with` to the `resolve()` API call which will then forward that value on to all relevant plugins. Here's an example of a plugin that can now be written: ```js const examplePlugin = { name: 'Example plugin', setup(build) { build.onResolve({ filter: /.*/ }, args => { if (args.with.type === 'external') return { external: true } }) } } require('esbuild').build({ stdin: { contents: ` import foo from "./foo" with { type: "external" } foo() `, }, bundle: true, format: 'esm', write: false, plugins: [examplePlugin], }).then(result => { console.log(result.outputFiles[0].text) }) ``` - Formatting support for the `@position-try` rule ([#3773](https://togithub.com/evanw/esbuild/issues/3773)) Chrome shipped this new CSS at-rule in version 125 as part of the [CSS anchor positioning API](https://developer.chrome.com/blog/anchor-positioning-api). With this release, esbuild now knows to expect a declaration list inside of the `@position-try` body block and will format it appropriately. - Always allow internal string import and export aliases ([#3343](https://togithub.com/evanw/esbuild/issues/3343)) Import and export names can be string literals in ES2022+. Previously esbuild forbid any usage of these aliases when the target was below ES2022. Starting with this release, esbuild will only forbid such usage when the alias would otherwise end up in output as a string literal. String literal aliases that are only used internally in the bundle and are "compiled away" are no longer errors. This makes it possible to use string literal aliases with esbuild's `inject` feature even when the target is earlier than ES2022. ### [`v0.21.3`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0213) [Compare Source](https://togithub.com/evanw/esbuild/compare/v0.21.2...v0.21.3) - Implement the decorator metadata proposal ([#3760](https://togithub.com/evanw/esbuild/issues/3760)) This release implements the [decorator metadata proposal](https://togithub.com/tc39/proposal-decorator-metadata), which is a sub-proposal of the [decorators proposal](https://togithub.com/tc39/proposal-decorators). Microsoft shipped the decorators proposal in [TypeScript 5.0](https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#decorators) and the decorator metadata proposal in [TypeScript 5.2](https://devblogs.microsoft.com/typescript/announcing-typescript-5-2/#decorator-metadata), so it's important that esbuild also supports both of these features. Here's a quick example: ```js // Shim the "Symbol.metadata" symbol Symbol.metadata ??= Symbol('Symbol.metadata') const track = (_, context) => { (context.metadata.names ||= []).push(context.name) } class Foo { @track foo = 1 @track bar = 2 } // Prints ["foo", "bar"] console.log(Foo[Symbol.metadata].names) ``` **⚠️ WARNING ⚠️** This proposal has been marked as "stage 3" which means "recommended for implementation". However, it's still a work in progress and isn't a part of JavaScript yet, so keep in mind that any code that uses JavaScript decorator metadata may need to be updated as the feature continues to evolve. If/when that happens, I will update esbuild's implementation to match the specification. I will not be supporting old versions of the specification. - Fix bundled decorators in derived classes ([#3768](https://togithub.com/evanw/esbuild/issues/3768)) In certain cases, bundling code that uses decorators in a derived class with a class body that references its own class name could previously generate code that crashes at run-time due to an incorrect variable name. This problem has been fixed. Here is an example of code that was compiled incorrectly before this fix: ```js class Foo extends Object { @(x => x) foo() { return Foo } } console.log(new Foo().foo()) ``` - Fix `tsconfig.json` files inside symlinked directories ([#3767](https://togithub.com/evanw/esbuild/issues/3767)) This release fixes an issue with a scenario involving a `tsconfig.json` file that `extends` another file from within a symlinked directory that uses the `paths` feature. In that case, the implicit `baseURL` value should be based on the real path (i.e. after expanding all symbolic links) instead of the original path. This was already done for other files that esbuild resolves but was not yet done for `tsconfig.json` because it's special-cased (the regular path resolver can't be used because the information inside `tsconfig.json` is involved in path resolution). Note that this fix no longer applies if the `--preserve-symlinks` setting is enabled. ### [`v0.21.2`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0212) [Compare Source](https://togithub.com/evanw/esbuild/compare/v0.21.1...v0.21.2) - Correct `this` in field and accessor decorators ([#3761](https://togithub.com/evanw/esbuild/issues/3761)) This release changes the value of `this` in initializers for class field and accessor decorators from the module-level `this` value to the appropriate `this` value for the decorated element (either the class or the instance). It was previously incorrect due to lack of test coverage. Here's an example of a decorator that doesn't work without this change: ```js const dec = () => function() { this.bar = true } class Foo { @dec static foo } console.log(Foo.bar) // Should be "true" ``` - Allow `es2023` as a target environment ([#3762](https://togithub.com/evanw/esbuild/issues/3762)) TypeScript recently [added `es2023`](https://togithub.com/microsoft/TypeScript/pull/58140) as a compilation target, so esbuild now supports this too. There is no difference between a target of `es2022` and `es2023` as far as esbuild is concerned since the 2023 edition of JavaScript doesn't introduce any new syntax features.Configuration
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