Provide a better error message when "async" is mistyped?

[JoshuaKGoldberg]

Search Terms

error message async function

Suggestion

When I mistype async as something like asdync, the error messages are quite unhelpful. It would be nice to have "did you mean async?" suggestions, as when we mistype a variable name. Perhaps if the edit distance from this particular keyword is small?

If this idea is a good one, it might make sense to expand it to public, protected, etc.

Use Cases

This is a common thing for me, sadly. I assume new users have this problem as well.

Examples

asdync foo() { }

class Foo {
    private asdync bar() { }
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript / JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. new expression-level syntax)

[bhushan-shah-dev]

I want to give this a go as my first PR, but would appreciate some direction.

[DanielRosenwasser]

Thank you @JoshuaKGoldberg!