bug: Unable to parse the correct TypeScript code.

[rxliuli]

An error accidentally discovered while using vitest, which upon inspection was found to be an error that occurred during the esbuild compilation of the code.

// src/index.ts
export function open(async?: boolean): void {
  console.log(async as boolean)
}

Command

➜  skitter pnpm esbuild src/index.ts
✘ [ERROR] Expected "=>" but found "boolean"

    src/index.ts:5:23:
      5 │   console.log(async as boolean)
        │                        ~~~~~~~
        ╵                        =>

1 error
➜  skitter pnpm tsc src/index.ts    
➜  skitter 

Of course, this error can be bypassed; I'm just reporting it in case someone else encounters this error as well.

---

It has been confirmed that both TypeScript and SWC can correctly compile this code.

[evanw]

Thanks for the report! This has been fixed, and should go out in the next release.