Update dependency esbuild to v0.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
esbuild	0.14.50 -> 0.15.6

---

Release Notes

evanw/esbuild

v0.15.6

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• Lower for await loops (#​1930)

  This release lowers for await loops to the equivalent for loop containing await when esbuild is configured such that for await loops are unsupported. This transform still requires at least generator functions to be supported since esbuild's lowering of await currently relies on generators. This new transformation is mostly modeled after what the TypeScript compiler does. Here's an example:

  async function f() {
    for await (let x of y)
      x()
  }

  The code above will now become the following code with --target=es2017 (omitting the code for the __forAwait helper function):

  async function f() {
    try {
      for (var iter = __forAwait(y), more, temp, error; more = !(temp = await iter.next()).done; more = false) {
        let x = temp.value;
        x();
      }
    } catch (temp) {
      error = [temp];
    } finally {
      try {
        more && (temp = iter.return) && await temp.call(iter);
      } finally {
        if (error)
          throw error[0];
      }
    }
  }

• Automatically fix invalid supported configurations (#​2497)

  The --target= setting lets you tell esbuild to target a specific version of one or more JavaScript runtimes such as chrome80,node14 and esbuild will restrict its output to only those features supported by all targeted JavaScript runtimes. More recently, esbuild introduced the --supported: setting that lets you override which features are supported on a per-feature basis. However, this now lets you configure nonsensical things such as --supported:async-await=false --supported:async-generator=true. Previously doing this could result in esbuild building successfully but producing invalid output.

  Starting with this release, esbuild will now attempt to automatically fix nonsensical feature override configurations by introducing more overrides until the configuration makes sense. So now the configuration from previous example will be changed such that async-await=false implies async-generator=false. The full list of implications that were introduced is below:

  • async-await=false implies:

    • async-generator=false
    • for-await=false
    • top-level-await=false

  • generator=false implies:

    • async-generator=false

  • object-accessors=false implies:

    • class-private-accessor=false
    • class-private-static-accessor=false

  • class-field=false implies:

    • class-private-field=false

  • class-static-field=false implies:

    • class-private-static-field=false

  • class=false implies:

    • class-field=false
    • class-private-accessor=false
    • class-private-brand-check=false
    • class-private-field=false
    • class-private-method=false
    • class-private-static-accessor=false
    • class-private-static-field=false
    • class-private-static-method=false
    • class-static-blocks=false
    • class-static-field=false

• Implement a small minification improvement (#​2496)

  Some people write code that contains a label with an immediate break such as x: break x. Previously this code was not removed during minification but it will now be removed during minification starting with this release.

• Fix installing esbuild via Yarn with enableScripts: false configured (#​2457)

  If esbuild is installed with Yarn with the enableScripts: false setting configured, then Yarn will not "unplug" the esbuild package (i.e. it will keep the entire package inside a .zip file). This messes with esbuild's library code that extracts the platform-specific binary executable because that code copies the binary executable into the esbuild package directory, and Yarn's .zip file system shim doesn't let you write to a directory inside of a .zip file. This release fixes this problem by writing to the node_modules/.cache/esbuild directory instead in this case. So you should now be able to use esbuild with Yarn when enableScripts: false is configured.

  This fix was contributed by @​jonaskuske.

v0.15.5

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• Fix issues with Yarn PnP and Yarn's workspaces feature (#​2476)

  This release makes sure esbuild works with a Yarn feature called workspaces. Previously esbuild wasn't tested in this scenario, but this scenario now has test coverage. Getting this to work involved further tweaks to esbuild's custom code for what happens after Yarn PnP's path resolution algorithm runs, which is not currently covered by Yarn's PnP specification. These tweaks also fix exports map resolution with Yarn PnP for non-empty subpaths, which wasn't previously working.

v0.15.4

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• Consider TypeScript import assignments to be side-effect free (#​2468)

  TypeScript has a legacy import syntax for working with TypeScript namespaces that looks like this:

  import { someNamespace } from './some-file'
  import bar = someNamespace.foo;
  
  // some-file.ts
  export namespace someNamespace {
    export let foo = 123
  }

  Since esbuild converts TypeScript into JavaScript one file at a time, it doesn't know if bar is supposed to be a value or a type (or both, which TypeScript actually allows in this case). This is problematic because values are supposed to be kept during the conversion but types are supposed to be removed during the conversion. Currently esbuild keeps bar in the output, which is done because someNamespace.foo is a property access and property accesses run code that could potentially have a side effect (although there is no side effect in this case).

  With this release, esbuild will now consider someNamespace.foo to have no side effects. This means bar will now be removed when bundling and when tree shaking is enabled. Note that it will still not be removed when tree shaking is disabled. This is because in this mode, esbuild supports adding additional code to the end of the generated output that's in the same scope as the module. That code could potentially make use of bar, so it would be incorrect to remove it. If you want bar to be removed, you'll have to enable tree shaking (which tells esbuild that nothing else depends on the unexported top-level symbols in the generated output).

• Change the order of the banner and the "use strict" directive (#​2467)

  Previously the top of the file contained the following things in order:

  1. The hashbang comment (see below) from the source code, if present
  2. The "use strict" directive from the source code, if present
  3. The content of esbuild's banner API option, if specified

  This was problematic for people that used the banner API option to insert the hashbang comment instead of using esbuild's hashbang comment preservation feature. So with this release, the order has now been changed to:

  1. The hashbang comment (see below) from the source code, if present
  2. The content of esbuild's banner API option, if specified
  3. The "use strict" directive from the source code, if present

  I'm considering this change to be a bug fix instead of a breaking change because esbuild's documentation states that the banner API option can be used to "insert an arbitrary string at the beginning of generated JavaScript files". While this isn't technically true because esbuild may still insert the original hashbang comment before the banner, it's at least more correct now because the banner will now come before the "use strict" directive.

  For context: JavaScript files recently allowed using a hashbang comment, which starts with #! and which must start at the very first character of the file. It allows Unix systems to execute the file directly as a script without needing to prefix it by the node command. This comment typically has the value #!/usr/bin/env node. Hashbang comments will be a part of ES2023 when it's released next year.

• Fix exports maps with Yarn PnP path resolution (#​2473)

  The Yarn PnP specification says that to resolve a package path, you first resolve it to the absolute path of a directory, and then you run node's module resolution algorithm on it. Previously esbuild followed this part of the specification. However, doing this means that exports in package.json is not respected because node's module resolution algorithm doesn't interpret exports for absolute paths. So with this release, esbuild will now use a modified algorithm that deviates from both specifications but that should hopefully behave more similar to what Yarn actually does: node's module resolution algorithm is run with the original import path but starting from the directory returned by Yarn PnP.

v0.15.3

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• Change the Yarn PnP manifest to a singleton (#​2463)

  Previously esbuild searched for the Yarn PnP manifest in the parent directories of each file. But with Yarn's enableGlobalCache setting it's possible to configure Yarn PnP's implementation to reach outside of the directory subtree containing the Yarn PnP manifest. This was causing esbuild to fail to bundle projects with the enableGlobalCache setting enabled.

  To handle this case, esbuild will now only search for the Yarn PnP manifest in the current working directory of the esbuild process. If you're using esbuild's CLI, this means you will now have to cd into the appropriate directory first. If you're using esbuild's API, you can override esbuild's value for the current working directory with the absWorkingDir API option.

• Fix Yarn PnP resolution failures due to backslashes in paths on Windows (#​2462)

  Previously dependencies of a Yarn PnP virtual dependency failed to resolve on Windows. This was because Windows uses \ instead of / as a path separator, and the path manipulation algorithms used for Yarn PnP expected /. This release converts \ into / in Windows paths, which fixes this issue.

• Fix sideEffects patterns containing slashes on Windows (#​2465)

  The sideEffects field in package.json lets you specify an array of patterns to mark which files have side effects (which causes all other files to be considered to not have side effects by exclusion). That looks like this:

  "sideEffects": [
    "**/index.js",
    "**/index.prod.js"
  ]

  However, the presence of the / character in the pattern meant that the pattern failed to match Windows-style paths, which broke sideEffects on Windows in this case. This release fixes this problem by adding additional code to handle Windows-style paths.

v0.15.2

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• Fix Yarn PnP issue with packages containing index.js (#​2455, #​2461)

  Yarn PnP's tests require the resolved paths to end in /. That's not how the rest of esbuild's internals work, however, and doing this messed up esbuild's node module path resolution regarding automatically-detected index.js files. Previously packages that relied on implicit index.js resolution rules didn't work with esbuild under Yarn PnP. Removing this slash has fixed esbuild's path resolution behavior regarding index.js, which should now the same both with and without Yarn PnP.

• Fix Yarn PnP support for extends in tsconfig.json (#​2456)

  Previously using extends in tsconfig.json with a path in a Yarn PnP package didn't work. This is because the process of setting up package path resolution rules requires parsing tsconfig.json files (due to the baseUrl and paths features) and resolving extends to a package path requires package path resolution rules to already be set up, which is a circular dependency. This cycle is broken by using special rules for extends in tsconfig.json that bypasses esbuild's normal package path resolution process. This is why using extends with a Yarn PnP package didn't automatically work. With this release, these special rules have been modified to check for a Yarn PnP manifest so this case should work now.

• Fix Yarn PnP support in esbuild-wasm (#​2458)

  When running esbuild via WebAssembly, Yarn PnP support previously failed because Go's file system internals return EINVAL when trying to read a .zip file as a directory when run with WebAssembly. This was unexpected because Go's file system internals return ENOTDIR for this case on native. This release updates esbuild to treat EINVAL like ENOTDIR in this case, which fixes using esbuild-wasm to bundle a Yarn PnP project.

  Note that to be able to use esbuild-wasm for Yarn PnP successfully, you currently have to run it using node instead of yarn node. This is because the file system shim that Yarn overwrites node's native file system API with currently generates invalid file descriptors with negative values when inside a .zip file. This prevents esbuild from working correctly because Go's file system internals don't expect syscalls that succeed without an error to return an invalid file descriptor. Yarn is working on fixing their use of invalid file descriptors.

v0.15.1

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• Update esbuild's Yarn Plug'n'Play implementation to match the latest specification changes (#​2452, #​2453)

  This release updates esbuild's implementation of Yarn Plug'n'Play to match some changes to Yarn's specification that just landed. The changes are as follows:

  • Check for platform-specific absolute paths instead of always for the / prefix

    The specification previously said that Yarn Plug'n'Play path resolution rules should not apply for paths that start with /. The intent was to avoid accidentally processing absolute paths. However, absolute paths on Windows such as C:\project start with drive letters instead of with /. So the specification was changed to instead explicitly avoid processing absolute paths.

  • Make $$virtual an alias for __virtual__

    Supporting Yarn-style path resolution requires implementing a custom Yarn-specific path traversal scheme where certain path segments are considered no-ops. Specifically any path containing segments of the form __virtual__/<whatever>/<n> where <n> is an integer must be treated as if they were n times the .. operator instead (the <whatever> path segment is ignored). So /path/to/project/__virtual__/xyz/2/foo.js maps to the underlying file /path/to/project/../../foo.js. This scheme makes it possible for Yarn to get node (and esbuild) to load the same file multiple times (which is sometimes required for correctness) without actually duplicating the file on the file system.

    However, old versions of Yarn used to use $$virtual instead of __virtual__. This was changed because $$virtual was error-prone due to the use of the $ character, which can cause bugs when it's not correctly escaped within regular expressions. Now that esbuild makes $$virtual an alias for __virtual__, esbuild should now work with manifests from these old Yarn versions.

  • Ignore PnP manifests in virtual directories

    The specification describes the algorithm for how to find the Plug'n'Play manifest when starting from a certain point in the file system: search through all parent directories in reverse order until the manifest is found. However, this interacts poorly with virtual paths since it can end up finding a virtual copy of the manifest instead of the original. To avoid this, esbuild now ignores manifests in virtual directories so that the search for the manifest will continue and find the original manifest in another parent directory later on.

  These fixes mean that esbuild's implementation of Plug'n'Play now matches Yarn's implementation more closely, and esbuild can now correctly build more projects that use Plug'n'Play.

v0.15.0

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This release contains backwards-incompatible changes. Since esbuild is before version 1.0.0, these changes have been released as a new minor version to reflect this (as recommended by npm). You should either be pinning the exact version of esbuild in your package.json file or be using a version range syntax that only accepts patch upgrades such as ~0.14.0. See the documentation about semver for more information.

• Implement the Yarn Plug'n'Play module resolution algorithm (#​154, #​237, #​1263, #​2451)

  Node comes with a package manager called npm, which installs packages into a node_modules folder. Node and esbuild both come with built-in rules for resolving import paths to packages within node_modules, so packages installed via npm work automatically without any configuration. However, many people use an alternative package manager called Yarn. While Yarn can install packages using node_modules, it also offers a different package installation strategy called Plug'n'Play, which is often shortened to "PnP" (not to be confused with pnpm, which is an entirely different unrelated package manager).

  Plug'n'Play installs packages as .zip files on your file system. The packages are never actually unzipped. Since Node doesn't know anything about Yarn's package installation strategy, this means you can no longer run your code with Node as it won't be able to find your packages. Instead, you need to run your code with Yarn, which applies patches to Node's file system APIs before running your code. These patches attempt to make zip files seem like normal directories. When running under Yarn, using Node's file system API to read ./some.zip/lib/file.js actually automatically extracts lib/file.js from ./some.zip at run-time as if it was a normal file. Other file system APIs behave similarly. However, these patches don't work with esbuild because esbuild is not written in JavaScript; it's a native binary executable that interacts with the file system directly through the operating system.

  Previously the workaround for using esbuild with Plug'n'Play was to use the @yarnpkg/esbuild-plugin-pnp plugin with esbuild's JavaScript API. However, this wasn't great because the plugin needed to potentially intercept every single import path and file load to check whether it was a Plug'n'Play package, which has an unusually high performance cost. It also meant that certain subtleties of path resolution rules within a .zip file could differ slightly from the way esbuild normally works since path resolution inside .zip files was implemented by Yarn, not by esbuild (which is due to a limitation of esbuild's plugin API).

  With this release, esbuild now contains an independent implementation of Yarn's Plug'n'Play algorithm (which is used when esbuild finds a .pnp.js, .pnp.cjs, or .pnp.data.json file in the directory tree). Creating additional implementations of this algorithm recently became possible because Yarn's package manifest format was recently documented: https://yarnpkg.com/advanced/pnp-spec/. This should mean that you can now use esbuild to bundle Plug'n'Play projects without any additional configuration (so you shouldn't need @yarnpkg/esbuild-plugin-pnp anymore). Bundling these projects should now happen much faster as Yarn no longer even needs to be run at all. Bundling the Yarn codebase itself with esbuild before and after this change seems to demonstrate over a 10x speedup (3.4s to 0.24s). And path resolution rules within Yarn packages should now be consistent with how esbuild handles regular Node packages. For example, fields such as module and browser in package.json files within .zip files should now be respected.

  Keep in mind that this is brand new code and there may be some initial issues to work through before esbuild's implementation is solid. Yarn's Plug'n'Play specification is also brand new and may need some follow-up edits to guide new implementations to match Yarn's exact behavior. If you try this out, make sure to test it before committing to using it, and let me know if anything isn't working as expected. Should you need to debug esbuild's path resolution, you may find --log-level=verbose helpful.

v0.14.54

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• Fix optimizations for calls containing spread arguments (#​2445)

  This release fixes the handling of spread arguments in the optimization of /* @​__PURE__ */ comments, empty functions, and identity functions:

  // Original code
  function empty() {}
  function identity(x) { return x }
  /* @​__PURE__ */ a(...x)
  /* @​__PURE__ */ new b(...x)
  empty(...x)
  identity(...x)
  
  // Old output (with --minify --tree-shaking=true)
  ...x;...x;...x;...x;
  
  // New output (with --minify --tree-shaking=true)
  function identity(n){return n}[...x];[...x];[...x];identity(...x);

  Previously esbuild assumed arguments with side effects could be directly inlined. This is almost always true except for spread arguments, which are not syntactically valid on their own and which have the side effect of causing iteration, which might have further side effects. Now esbuild will wrap these elements in an unused array so that they are syntactically valid and so that the iteration side effects are preserved.

v0.14.53

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This release fixes a minor issue with the previous release: I had to rename the package esbuild-linux-loong64 to @esbuild/linux-loong64 in the contributed PR because someone registered the package name before I could claim it, and I missed a spot. Hopefully everything is working after this release. I plan to change all platform-specific package names to use the @esbuild/ scope at some point to avoid this problem in the future.

v0.14.52

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• Allow binary data as input to the JS transform and build APIs (#​2424)

  Previously esbuild's transform and build APIs could only take a string. However, some people want to use esbuild to convert binary data to base64 text. This is problematic because JavaScript strings represent UTF-16 text and esbuild internally operates on arrays of bytes, so all strings coming from JavaScript undergo UTF-16 to UTF-8 conversion before use. This meant that using esbuild in this way was doing base64 encoding of the UTF-8 encoding of the text, which was undesired.

  With this release, esbuild now accepts Uint8Array in addition to string as an input format for the transform and build APIs. Now you can use esbuild to convert binary data to base64 text:

  // Original code
  import esbuild from 'esbuild'
  console.log([
    (await esbuild.transform('\xFF', { loader: 'base64' })).code,
    (await esbuild.build({ stdin: { contents: '\xFF', loader: 'base64' }, write: false })).outputFiles[0].text,
  ])
  console.log([
    (await esbuild.transform(new Uint8Array([0xFF]), { loader: 'base64' })).code,
    (await esbuild.build({ stdin: { contents: new Uint8Array([0xFF]), loader: 'base64' }, write: false })).outputFiles[0].text,
  ])
  
  // Old output
  [ 'module.exports = "w78=";\n', 'module.exports = "w78=";\n' ]
  /* ERROR: The input to "transform" must be a string */
  
  // New output
  [ 'module.exports = "w78=";\n', 'module.exports = "w78=";\n' ]
  [ 'module.exports = "/w==";\n', 'module.exports = "/w==";\n' ]

• Update the getter for text in build results (#​2423)

  Output files in build results returned from esbuild's JavaScript API have both a contents and a text property to return the contents of the output file. The contents property is a binary UTF-8 Uint8Array and the text property is a JavaScript UTF-16 string. The text property is a getter that does the UTF-8 to UTF-16 conversion only if it's needed for better performance.

  Previously if you mutate the build results object, you had to overwrite both contents and text since the value returned from the text getter is the original text returned by esbuild. Some people find this confusing so with this release, the getter for text has been updated to do the UTF-8 to UTF-16 conversion on the current value of the contents property instead of the original value.

• Publish builds for Linux LoongArch 64-bit (#​1804, #​2373)

  This release upgrades to Go 1.19, which now includes support for LoongArch 64-bit processors. LoongArch 64-bit builds of esbuild will now be published to npm, which means that in theory they can now be installed with npm install esbuild. This was contributed by @​beyond-1234.

v0.14.51

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• Add support for React 17's automatic JSX transform (#​334, #​718, #​1172, #​2318, #​2349)

  This adds support for the new "automatic" JSX runtime from React 17+ to esbuild for both the build and transform APIs.

  New CLI flags and API options:

  • --jsx, jsx — Set this to "automatic" to opt in to this new transform
  • --jsx-dev, jsxDev — Toggles development mode for the automatic runtime
  • --jsx-import-source, jsxImportSource — Overrides the root import for runtime functions (default "react")

  New JSX pragma comments:

  • @jsxRuntime — Sets the runtime (automatic or classic)
  • @jsxImportSource — Sets the import source (only valid with automatic runtime)

  The existing @jsxFragment and @jsxFactory pragma comments are only valid with "classic" runtime.

  TSConfig resolving:
  Along with accepting the new options directly via CLI or API, option inference from tsconfig.json compiler options was also implemented:

  • "jsx": "preserve" or "jsx": "react-native" → Same as --jsx=preserve in esbuild
  • "jsx": "react" → Same as --jsx=transform in esbuild (which is the default behavior)
  • "jsx": "react-jsx" → Same as --jsx=automatic in esbuild
  • "jsx": "react-jsxdev" → Same as --jsx=automatic --jsx-dev in esbuild

  It also reads the value of "jsxImportSource" from tsconfig.json if specified.

  For react-jsx it's important to note that it doesn't implicitly disable --jsx-dev. This is to support the case where a user sets "react-jsx" in their tsconfig.json but then toggles development mode directly in esbuild.

  esbuild vs Babel vs TS vs...

  There are a few differences between the various technologies that implement automatic JSX runtimes. The JSX transform in esbuild follows a mix of Babel's and TypeScript's behavior:

  • When an element has __source or __self props:

    • Babel: Print an error about a deprecated transform plugin
    • TypeScript: Allow the props
    • swc: Hard crash
    • esbuild: Print an error — Following Babel was chosen for this one because this might help people catch configuration issues where JSX files are being parsed by multiple tools

  • Element has an "implicit true" key prop, e.g. <a key />:

    • Babel: Print an error indicating that "key" props require an explicit value
    • TypeScript: Silently omit the "key" prop
    • swc: Hard crash
    • esbuild: Print an error like Babel — This might help catch legitimate programming mistakes

  • Element has spread children, e.g. <a>{...children}</a>

    • Babel: Print an error stating that React doesn't support spread children
    • TypeScript: Use static jsx function and pass children as-is, including spread operator
    • swc: same as Babel
    • esbuild: Same as TypeScript

  Also note that TypeScript has some bugs regarding JSX development mode and the generation of lineNumber and columnNumber values. Babel's values are accurate though, so esbuild's line and column numbers match Babel. Both numbers are 1-based and columns are counted in terms of UTF-16 code units.

  This feature was contributed by @​jgoz.

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