This release implements the decorator metadata proposal, which is a sub-proposal of the decorators proposal. Microsoft shipped the decorators proposal in TypeScript 5.0 and the decorator metadata proposal in TypeScript 5.2, so it's important that esbuild also supports both of these features. Here's a quick example:
// Shim the "Symbol.metadata" symbol
Symbol.metadata ??= Symbol('Symbol.metadata')
// 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.
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:
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
Correct this in field and accessor decorators (#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:
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:
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)
}
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Bumps the dev-deps group with 8 updates in the / directory:
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chore(release): publish 7.10.08d92ba8
docs: [no-floating-promises] fix capitalization typo (#9118)d951d83
fix(eslint-plugin): [prefer-regexp-exec] fix heuristic to check whether regex...987a96e
feat(eslint-plugin): [sort-type-constituents] support case sensitive sorting ...77fc366
chore(release): publish 7.9.0f53fece
chore: add knip (#8192)8acb8d4
fix(eslint-plugin): [explicit-function-return-types] fix false positive on de...d696ea2
docs(eslint-plugin): fix several 404 URLs (#9064)37a41d9
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chore(release): publish 7.10.077fc366
chore(release): publish 7.9.0f53fece
chore: add knip (#8192)ee677f6
chore(release): publish 7.8.03e19436
chore(release): publish 7.7.1e44a1a2
chore(release): publish 7.7.0e1db872
chore(release): publish 7.6.0a6ab2cb
feat: bump npm dependency ranges (#8860)a14ba9d
chore(release): publish 7.5.0ecb6b55
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fix #3760: implement decorator metadata proposalbd0b13b
lowering: always propagate class expression names90acd14
explicit bitwise operators for initializer flagsba548df
move decorator initializer list to after the class66b7c6d
fix #3768: bundled decorators in derived classes6e6f15f
fix #3767:tsconfig.json
files inside symlinksb7dcb95
transform: reuselowerField
for auto-accessorsb24180e
publish 0.21.2 to npmf82e0ad
fix #3761:this
in field and accessor decoratorsUpdates
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Version Packages (#4625)1b00c07
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Release v10.4.07ac67f3
build(deps): bump the github-actions group with 2 updates (#5125)7a2781c
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fix: harden error handling inlib/cli/run.js
(#5074)6f3f45e
fix: xunit integration test (#5122)a5b5652
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Update LKG9f33bf1
🤖 Pick PR #58098 (Fix constraints of nested homomorph...) into release-5.4 (#...71b2f84
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