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|---|---|---|---|---|---|---|---|
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| [esbuild](https://togithub.com/evanw/esbuild) | devDependencies |
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🔧 This Pull Request updates lock files to use the latest dependency
versions.
---
### Release Notes
<details>
<summary>evanw/esbuild (esbuild)</summary>
###
[`v0.21.1`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0211)
[Compare
Source](https://togithub.com/evanw/esbuild/compare/v0.21.0...v0.21.1)
- Fix a regression with `--keep-names`
([#​3756](https://togithub.com/evanw/esbuild/issues/3756))
The previous release introduced a regression with the `--keep-names`
setting and object literals with `get`/`set` accessor methods, in which
case the generated code contained syntax errors. This release fixes the
regression:
```js
// Original code
x = { get y() {} }
// Output from version 0.21.0 (with --keep-names)
x = { get y: /* @​__PURE__ */ __name(function() {
}, "y") };
// Output from this version (with --keep-names)
x = { get y() {
} };
```
###
[`v0.21.0`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0210)
[Compare
Source](https://togithub.com/evanw/esbuild/compare/v0.20.2...v0.21.0)
This release doesn't contain any deliberately-breaking changes. However,
it contains a very complex new feature and while all of esbuild's tests
pass, I would not be surprised if an important edge case turns out to be
broken. So I'm releasing this as a breaking change release to avoid
causing any trouble. As usual, make sure to test your code when you
upgrade.
- Implement the JavaScript decorators proposal
([#​104](https://togithub.com/evanw/esbuild/issues/104))
With this release, esbuild now contains an implementation of the
upcoming [JavaScript decorators
proposal](https://togithub.com/tc39/proposal-decorators). This is the
same feature that shipped in [TypeScript
5.0](https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#decorators)
and has been highly-requested on esbuild's issue tracker. You can read
more about them in that blog post and in this other (now slightly
outdated) extensive blog post here:
https://2ality.com/2022/10/javascript-decorators.html. Here's a quick
example:
```js
const log = (fn, context) => function() {
console.log(`before ${context.name}`)
const it = fn.apply(this, arguments)
console.log(`after ${context.name}`)
return it
}
class Foo {
@​log static foo() {
console.log('in foo')
}
}
// Logs "before foo", "in foo", "after foo"
Foo.foo()
```
Note that this feature is different than the existing "TypeScript
experimental decorators" feature that esbuild already implements. It
uses similar syntax but behaves very differently, and the two are not
compatible (although it's sometimes possible to write decorators that
work with both). TypeScript experimental decorators will still be
supported by esbuild going forward as they have been around for a long
time, are very widely used, and let you do certain things that are not
possible with JavaScript decorators (such as decorating function
parameters). By default esbuild will parse and transform JavaScript
decorators, but you can tell esbuild to parse and transform TypeScript
experimental decorators instead by setting `"experimentalDecorators":
true` in your `tsconfig.json` file.
Probably at least half of the work for this feature went into creating a
test suite that exercises many of the proposal's edge cases:
https://github.com/evanw/decorator-tests. It has given me a reasonable
level of confidence that esbuild's initial implementation is acceptable.
However, I don't have access to a significant sample of real code that
uses JavaScript decorators. If you're currently using JavaScript
decorators in a real code base, please try out esbuild's implementation
and let me know if anything seems off.
**⚠️ WARNING ⚠️**
This proposal has been in the works for a very long time (work began
around 10 years ago in 2014) and it is finally getting close to becoming
part of the JavaScript language. 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 decorators may need to be updated as the feature
continues to evolve. The decorators proposal is pretty close to its
final form but it can and likely will undergo some small behavioral
adjustments before it ends up becoming a part of the standard. If/when
that happens, I will update esbuild's implementation to match the
specification. I will not be supporting old versions of the
specification.
- Optimize the generated code for private methods
Previously when lowering private methods for old browsers, esbuild would
generate one `WeakSet` for each private method. This mirrors similar
logic for generating one `WeakSet` for each private field. Using a
separate `WeakMap` for private fields is necessary as their assignment
can be observable:
```js
let it
class Bar {
constructor() {
it = this
}
}
class Foo extends Bar {
#x = 1
#y = null.foo
static check() {
console.log(#x in it, #y in it)
}
}
try { new Foo } catch {}
Foo.check()
```
This prints `true false` because this partially-initialized instance has
`#x` but not `#y`. In other words, it's not true that all class
instances will always have all of their private fields. However, the
assignment of private methods to a class instance is not observable. In
other words, it's true that all class instances will always have all of
their private methods. This means esbuild can lower private methods into
code where all methods share a single `WeakSet`, which is smaller,
faster, and uses less memory. Other JavaScript processing tools such as
the TypeScript compiler already make this optimization. Here's what this
change looks like:
```js
// Original code
class Foo {
#x() { return this.#x() }
#y() { return this.#y() }
#z() { return this.#z() }
}
// Old output (--supported:class-private-method=false)
var _x, x_fn, _y, y_fn, _z, z_fn;
class Foo {
constructor() {
__privateAdd(this, _x);
__privateAdd(this, _y);
__privateAdd(this, _z);
}
}
_x = new WeakSet();
x_fn = function() {
return __privateMethod(this, _x, x_fn).call(this);
};
_y = new WeakSet();
y_fn = function() {
return __privateMethod(this, _y, y_fn).call(this);
};
_z = new WeakSet();
z_fn = function() {
return __privateMethod(this, _z, z_fn).call(this);
};
// New output (--supported:class-private-method=false)
var _Foo_instances, x_fn, y_fn, z_fn;
class Foo {
constructor() {
__privateAdd(this, _Foo_instances);
}
}
_Foo_instances = new WeakSet();
x_fn = function() {
return __privateMethod(this, _Foo_instances, x_fn).call(this);
};
y_fn = function() {
return __privateMethod(this, _Foo_instances, y_fn).call(this);
};
z_fn = function() {
return __privateMethod(this, _Foo_instances, z_fn).call(this);
};
```
- Fix an obscure bug with lowering class members with computed property
keys
When class members that use newer syntax features are transformed for
older target environments, they sometimes need to be relocated. However,
care must be taken to not reorder any side effects caused by computed
property keys. For example, the following code must evaluate `a()` then
`b()` then `c()`:
```js
class Foo {
[a()]() {}
[b()];
static { c() }
}
```
Previously esbuild did this by shifting the computed property key
*forward* to the next spot in the evaluation order. Classes evaluate all
computed keys first and then all static class elements, so if the last
computed key needs to be shifted, esbuild previously inserted a static
block at start of the class body, ensuring it came before all other
static class elements:
```js
var _a;
class Foo {
constructor() {
__publicField(this, _a);
}
static {
_a = b();
}
[a()]() {
}
static {
c();
}
}
```
However, this could cause esbuild to accidentally generate a syntax
error if the computed property key contains code that isn't allowed in a
static block, such as an `await` expression. With this release, esbuild
fixes this problem by shifting the computed property key *backward* to
the previous spot in the evaluation order instead, which may push it
into the `extends` clause or even before the class itself:
```js
// Original code
class Foo {
[a()]() {}
[await b()];
static { c() }
}
// Old output (with --supported:class-field=false)
var _a;
class Foo {
constructor() {
__publicField(this, _a);
}
static {
_a = await b();
}
[a()]() {
}
static {
c();
}
}
// New output (with --supported:class-field=false)
var _a, _b;
class Foo {
constructor() {
__publicField(this, _a);
}
[(_b = a(), _a = await b(), _b)]() {
}
static {
c();
}
}
```
- Fix some `--keep-names` edge cases
The [`NamedEvaluation` syntax-directed
operation](https://tc39.es/ecma262/#sec-runtime-semantics-namedevaluation)
in the JavaScript specification gives certain anonymous expressions a
`name` property depending on where they are in the syntax tree. For
example, the following initializers convey a `name` value:
```js
var foo = function() {}
var bar = class {}
console.log(foo.name, bar.name)
```
When you enable esbuild's `--keep-names` setting, esbuild generates
additional code to represent this `NamedEvaluation` operation so that
the value of the `name` property persists even when the identifiers are
renamed (e.g. due to minification).
However, I recently learned that esbuild's implementation of
`NamedEvaluation` is missing a few cases. Specifically esbuild was
missing property definitions, class initializers, logical-assignment
operators. These cases should now all be handled:
```js
var obj = { foo: function() {} }
class Foo0 { foo = function() {} }
class Foo1 { static foo = function() {} }
class Foo2 { accessor foo = function() {} }
class Foo3 { static accessor foo = function() {} }
foo ||= function() {}
foo &&= function() {}
foo ??= function() {}
```
</details>
---
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This PR contains the following updates:
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|---|---|
| lockFileMaintenance | All locks refreshed |
🔧 This Pull Request updates lock files to use the latest dependency
versions.
---
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