Update dependency esbuild to v0.18.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
esbuild	0.18.7 -> 0.18.8

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Release Notes

evanw/esbuild

v0.18.8

Compare Source

• Implement transforming async generator functions (#​2780)

  With this release, esbuild will now transform async generator functions into normal generator functions when the configured target environment doesn't support them. These functions behave similar to normal generator functions except that they use the Symbol.asyncIterator interface instead of the Symbol.iterator interface and the iteration methods return promises. Here's an example (helper functions are omitted):

  // Original code
  async function* foo() {
    yield Promise.resolve(1)
    await new Promise(r => setTimeout(r, 100))
    yield *[Promise.resolve(2)]
  }
  async function bar() {
    for await (const x of foo()) {
      console.log(x)
    }
  }
  bar()
  
  // New output (with --target=es6)
  function foo() {
    return __asyncGenerator(this, null, function* () {
      yield Promise.resolve(1);
      yield new __await(new Promise((r) => setTimeout(r, 100)));
      yield* __yieldStar([Promise.resolve(2)]);
    });
  }
  function bar() {
    return __async(this, null, function* () {
      try {
        for (var iter = __forAwait(foo()), more, temp, error; more = !(temp = yield iter.next()).done; more = false) {
          const x = temp.value;
          console.log(x);
        }
      } catch (temp) {
        error = [temp];
      } finally {
        try {
          more && (temp = iter.return) && (yield temp.call(iter));
        } finally {
          if (error)
            throw error[0];
        }
      }
    });
  }
  bar();

  This is an older feature that was added to JavaScript in ES2018 but I didn't implement the transformation then because it's a rarely-used feature. Note that esbuild already added support for transforming for await loops (the other part of the asynchronous iteration proposal) a year ago, so support for asynchronous iteration should now be complete.

  I have never used this feature myself and code that uses this feature is hard to come by, so this transformation has not yet been tested on real-world code. If you do write code that uses this feature, please let me know if esbuild's async generator transformation doesn't work with your code.

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