chore(deps): update dependency esbuild to ^0.21.0 (#429)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [esbuild](https://togithub.com/evanw/esbuild) | [`^0.20.0` ->
`^0.21.0`](https://renovatebot.com/diffs/npm/esbuild/0.20.0/0.21.1) |
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|
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|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/esbuild/0.20.0/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/esbuild/0.20.0/0.21.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### 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`
([#&#8203;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: /* @&#8203;__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
([#&#8203;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 {
      @&#8203;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() {}
    ```

###
[`v0.20.2`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0202)

[Compare
Source](https://togithub.com/evanw/esbuild/compare/v0.20.1...v0.20.2)

- Support TypeScript experimental decorators on `abstract` class fields
([#&#8203;3684](https://togithub.com/evanw/esbuild/issues/3684))

With this release, you can now use TypeScript experimental decorators on
`abstract` class fields. This was silently compiled incorrectly in
esbuild 0.19.7 and below, and was an error from esbuild 0.19.8 to
esbuild 0.20.1. Code such as the following should now work correctly:

    ```ts
    // Original code
    const log = (x: any, y: string) => console.log(y)
    abstract class Foo { @&#8203;log abstract foo: string }
    new class extends Foo { foo = '' }

// Old output (with --loader=ts
--tsconfig-raw={\"compilerOptions\":{\"experimentalDecorators\":true}})
    const log = (x, y) => console.log(y);
    class Foo {
    }
    new class extends Foo {
      foo = "";
    }();

// New output (with --loader=ts
--tsconfig-raw={\"compilerOptions\":{\"experimentalDecorators\":true}})
    const log = (x, y) => console.log(y);
    class Foo {
    }
    __decorateClass([
      log
    ], Foo.prototype, "foo", 2);
    new class extends Foo {
      foo = "";
    }();
    ```

- JSON loader now preserves `__proto__` properties
([#&#8203;3700](https://togithub.com/evanw/esbuild/issues/3700))

Copying JSON source code into a JavaScript file will change its meaning
if a JSON object contains the `__proto__` key. A literal `__proto__`
property in a JavaScript object literal sets the prototype of the object
instead of adding a property named `__proto__`, while a literal
`__proto__` property in a JSON object literal just adds a property named
`__proto__`. With this release, esbuild will now work around this
problem by converting JSON to JavaScript with a computed property key in
this case:

    ```js
    // Original code
    import data from 'data:application/json,{"__proto__":{"fail":true}}'
    if (Object.getPrototypeOf(data)?.fail) throw 'fail'

    // Old output (with --bundle)
    (() => {
      // <data:application/json,{"__proto__":{"fail":true}}>
      var json_proto_fail_true_default = { __proto__: { fail: true } };

      // entry.js
      if (Object.getPrototypeOf(json_proto_fail_true_default)?.fail)
        throw "fail";
    })();

    // New output (with --bundle)
    (() => {
      // <data:application/json,{"__proto__":{"fail":true}}>
var json_proto_fail_true_default = { ["__proto__"]: { fail: true } };

      // example.mjs
      if (Object.getPrototypeOf(json_proto_fail_true_default)?.fail)
        throw "fail";
    })();
    ```

- Improve dead code removal of `switch` statements
([#&#8203;3659](https://togithub.com/evanw/esbuild/issues/3659))

With this release, esbuild will now remove `switch` statements in
branches when minifying if they are known to never be evaluated:

    ```js
    // Original code
    if (true) foo(); else switch (bar) { case 1: baz(); break }

    // Old output (with --minify)
    if(1)foo();else switch(bar){case 1:}

    // New output (with --minify)
    foo();
    ```

- Empty enums should behave like an object literal
([#&#8203;3657](https://togithub.com/evanw/esbuild/issues/3657))

TypeScript allows you to create an empty enum and add properties to it
at run time. While people usually use an empty object literal for this
instead of a TypeScript enum, esbuild's enum transform didn't anticipate
this use case and generated `undefined` instead of `{}` for an empty
enum. With this release, you can now use an empty enum to generate an
empty object literal.

    ```ts
    // Original code
    enum Foo {}

    // Old output (with --loader=ts)
    var Foo = /* @&#8203;__PURE__ */ ((Foo2) => {
    })(Foo || {});

    // New output (with --loader=ts)
    var Foo = /* @&#8203;__PURE__ */ ((Foo2) => {
      return Foo2;
    })(Foo || {});
    ```

- Handle Yarn Plug'n'Play edge case with `tsconfig.json`
([#&#8203;3698](https://togithub.com/evanw/esbuild/issues/3698))

Previously a `tsconfig.json` file that `extends` another file in a
package with an `exports` map failed to work when Yarn's Plug'n'Play
resolution was active. This edge case should work now starting with this
release.

- Work around issues with Deno 1.31+
([#&#8203;3682](https://togithub.com/evanw/esbuild/issues/3682))

Version 0.20.0 of esbuild changed how the esbuild child process is run
in esbuild's API for Deno. Previously it used `Deno.run` but that API is
being removed in favor of `Deno.Command`. As part of this change,
esbuild is now calling the new `unref` function on esbuild's long-lived
child process, which is supposed to allow Deno to exit when your code
has finished running even though the child process is still around
(previously you had to explicitly call esbuild's `stop()` function to
terminate the child process for Deno to be able to exit).

However, this introduced a problem for Deno's testing API which now
fails some tests that use esbuild with `error: Promise resolution is
still pending but the event loop has already resolved`. It's unclear to
me why this is happening. The call to `unref` was recommended by someone
on the Deno core team, and calling Node's equivalent `unref` API has
been working fine for esbuild in Node for a long time. It could be that
I'm using it incorrectly, or that there's some reference counting and/or
garbage collection bug in Deno's internals, or that Deno's `unref` just
works differently than Node's `unref`. In any case, it's not good for
Deno tests that use esbuild to be failing.

In this release, I am removing the call to `unref` to fix this issue.
This means that you will now have to call esbuild's `stop()` function to
allow Deno to exit, just like you did before esbuild version 0.20.0 when
this regression was introduced.

Note: This regression wasn't caught earlier because Deno doesn't seem to
fail tests that have outstanding `setTimeout` calls, which esbuild's
test harness was using to enforce a maximum test runtime. Adding a
`setTimeout` was allowing esbuild's Deno tests to succeed. So this
regression doesn't necessarily apply to all people using tests in Deno.

###
[`v0.20.1`](https://togithub.com/evanw/esbuild/blob/HEAD/CHANGELOG.md#0201)

[Compare
Source](https://togithub.com/evanw/esbuild/compare/v0.20.0...v0.20.1)

- Fix a bug with the CSS nesting transform
([#&#8203;3648](https://togithub.com/evanw/esbuild/issues/3648))

This release fixes a bug with the CSS nesting transform for older
browsers where the generated CSS could be incorrect if a selector list
contained a pseudo element followed by another selector. The bug was
caused by incorrectly mutating the parent rule's selector list when
filtering out pseudo elements for the child rules:

    ```css
    /* Original code */
    .foo {
      &:after,
      & .bar {
        color: red;
      }
    }

    /* Old output (with --supported:nesting=false) */
    .foo .bar,
    .foo .bar {
      color: red;
    }

    /* New output (with --supported:nesting=false) */
    .foo:after,
    .foo .bar {
      color: red;
    }
    ```

- Constant folding for JavaScript inequality operators
([#&#8203;3645](https://togithub.com/evanw/esbuild/issues/3645))

This release introduces constant folding for the `< > <= >=` operators.
The minifier will now replace these operators with `true` or `false`
when both sides are compile-time numeric or string constants:

    ```js
    // Original code
    console.log(1 < 2, '🍕' > '🧀')

    // Old output (with --minify)
    console.log(1<2,"🍕">"🧀");

    // New output (with --minify)
    console.log(!0,!1);
    ```

- Better handling of `__proto__` edge cases
([#&#8203;3651](https://togithub.com/evanw/esbuild/pull/3651))

JavaScript object literal syntax contains a special case where a
non-computed property with a key of `__proto__` sets the prototype of
the object. This does not apply to computed properties or to properties
that use the shorthand property syntax introduced in ES6. Previously
esbuild didn't correctly preserve the "sets the prototype" status of
properties inside an object literal, meaning a property that sets the
prototype could accidentally be transformed into one that doesn't and
vice versa. This has now been fixed:

    ```js
    // Original code
    function foo(__proto__) {
      return { __proto__: __proto__ } // Note: sets the prototype
    }
    function bar(__proto__, proto) {
      {
        let __proto__ = proto
        return { __proto__ } // Note: doesn't set the prototype
      }
    }

    // Old output
    function foo(__proto__) {
return { __proto__ }; // Note: no longer sets the prototype (WRONG)
    }
    function bar(__proto__, proto) {
      {
        let __proto__2 = proto;
return { __proto__: __proto__2 }; // Note: now sets the prototype
(WRONG)
      }
    }

    // New output
    function foo(__proto__) {
return { __proto__: __proto__ }; // Note: sets the prototype (correct)
    }
    function bar(__proto__, proto) {
      {
        let __proto__2 = proto;
return { ["__proto__"]: __proto__2 }; // Note: doesn't set the prototype
(correct)
      }
    }
    ```

- Fix cross-platform non-determinism with CSS color space
transformations
([#&#8203;3650](https://togithub.com/evanw/esbuild/issues/3650))

The Go compiler takes advantage of "fused multiply and add" (FMA)
instructions on certain processors which do the operation `x*y + z`
without intermediate rounding. This causes esbuild's CSS color space
math to differ on different processors (currently `ppc64le` and
`s390x`), which breaks esbuild's guarantee of deterministic output. To
avoid this, esbuild's color space math now inserts a `float64()` cast
around every single math operation. This tells the Go compiler not to
use the FMA optimization.

- Fix a crash when resolving a path from a directory that doesn't exist
([#&#8203;3634](https://togithub.com/evanw/esbuild/issues/3634))

This release fixes a regression where esbuild could crash when resolving
an absolute path if the source directory for the path resolution
operation doesn't exist. While this situation doesn't normally come up,
it could come up when running esbuild concurrently with another
operation that mutates the file system as esbuild is doing a build (such
as using `git` to switch branches). The underlying problem was a
regression that was introduced in version 0.18.0.

</details>

---

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package.json

@@ -46,7 +46,7 @@
     "@octokit/tsconfig": "^2.0.0",
     "@types/jest": "^29.5.11",
     "@types/node": "^20.11.5",
-    "esbuild": "^0.20.0",
+    "esbuild": "^0.21.0",
     "fetch-mock": "npm:@gr2m/fetch-mock@9.11.0-pull-request-644.1",
     "glob": "^10.3.10",
     "jest": "^29.7.0",