wrong transformation attempt of sequence expressions with target es5

[edoardocavazza]

With the following code and targeting es5

export function foo(check) {
    var hover = 1;
    return check ? (hover = 2, bar()) : baz();
}

esbuild exits with this error:

error: Transforming default arguments to the configured target environment ("es5") is not supported yet
    2 │     return check ? (this.hover = false, this.a()) : this.b();
      ╵                                ^

[evanw]

Thanks for the report. It looks like this is due to speculative parsing parentheses as an arrow function, and only happens in TypeScript code. I'll get this fixed in the next release.