Add a shim function for unbundled uses of require (#1202)
Modules in CommonJS format automatically get three variables injected into their scope: module, exports, and require. These allow the code to import other modules and to export things from itself. The bundler automatically rewrites uses of module and exports to refer to the module's exports and certain uses of require to a helper function that loads the imported module.
Not all uses of require can be converted though, and un-converted uses of require will end up in the output. This is problematic because require is only present at run-time if the output is run as a CommonJS module. Otherwise require is undefined, which means esbuild's behavior is inconsistent between compile-time and run-time. The module and exports variables are objects at compile-time and run-time but require is a function at compile-time and undefined at run-time. This causes code that checks for typeof require to have inconsistent behavior:
In the above example, ideally CommonJS detected would always be printed since the code is being bundled with a CommonJS-aware bundler. To fix this, esbuild will now substitute references to require with a stub __require function when bundling if the output format is something other than CommonJS. This should ensure that require is now consistent between compile-time and run-time. When bundled, code that uses unbundled references to require will now look something like this:
var __require = (x) => {
if (typeof require !== "undefined")
return require(x);
throw new Error('Dynamic require of "' + x + '" is not supported');
};
Fix incorrect caching of internal helper function library (#1292)
This release fixes a bug where running esbuild multiple times with different configurations sometimes resulted in code that would crash at run-time. The bug was introduced in version 0.11.19 and happened because esbuild's internal helper function library is parsed once and cached per configuration, but the new profiler name option was accidentally not included in the cache key. This option is now included in the cache key so this bug should now be fixed.
Minor performance improvements
This release contains some small performance improvements to offset an earlier minor performance regression due to the addition of certain features such as hashing for entry point files. The benchmark times on the esbuild website should now be accurate again (versions of esbuild after the regression but before this release were slightly slower than the benchmark).
v0.11.22
Add support for the "import assertions" proposal
This is new JavaScript syntax that was shipped in Chrome 91. It looks like this:
Add a shim function for unbundled uses of require (#1202)
Modules in CommonJS format automatically get three variables injected into their scope: module, exports, and require. These allow the code to import other modules and to export things from itself. The bundler automatically rewrites uses of module and exports to refer to the module's exports and certain uses of require to a helper function that loads the imported module.
Not all uses of require can be converted though, and un-converted uses of require will end up in the output. This is problematic because require is only present at run-time if the output is run as a CommonJS module. Otherwise require is undefined, which means esbuild's behavior is inconsistent between compile-time and run-time. The module and exports variables are objects at compile-time and run-time but require is a function at compile-time and undefined at run-time. This causes code that checks for typeof require to have inconsistent behavior:
In the above example, ideally CommonJS detected would always be printed since the code is being bundled with a CommonJS-aware bundler. To fix this, esbuild will now substitute references to require with a stub __require function when bundling if the output format is something other than CommonJS. This should ensure that require is now consistent between compile-time and run-time. When bundled, code that uses unbundled references to require will now look something like this:
var __require = (x) => {
if (typeof require !== "undefined")
return require(x);
throw new Error('Dynamic require of "' + x + '" is not supported');
};
Fix incorrect caching of internal helper function library (#1292)
This release fixes a bug where running esbuild multiple times with different configurations sometimes resulted in code that would crash at run-time. The bug was introduced in version 0.11.19 and happened because esbuild's internal helper function library is parsed once and cached per configuration, but the new profiler name option was accidentally not included in the cache key. This option is now included in the cache key so this bug should now be fixed.
Minor performance improvements
This release contains some small performance improvements to offset an earlier minor performance regression due to the addition of certain features such as hashing for entry point files. The benchmark times on the esbuild website should now be accurate again (versions of esbuild after the regression but before this release were slightly slower than the benchmark).
0.11.22
Add support for the "import assertions" proposal
This is new JavaScript syntax that was shipped in Chrome 91. It looks like this:
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Bumps esbuild from 0.11.20 to 0.11.23.
Release notes
Sourced from esbuild's releases.
... (truncated)
Changelog
Sourced from esbuild's changelog.
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Commits
3acd834
publish 0.11.23 to npm74c6312
perf: release notes20c9895
perf: avoid cloning "TopLevelSymbolToParts" mapc76a3da
perf: reduce empty struct allocationse951552
perf: parallelize minified name symbol counting29ea70a
fix #1292: include profiler names in the cache key32d79cd
perf: optimize for lots of warnings during linkinga960861
time individual import/export scan steps8e319c2
reduce allocations and pointer chasing in the ast28c72c0
perf: avoid unnecessarily rewriting output chunksDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
.If all status checks pass Dependabot will automatically merge this pull request.
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