JsWriter - Compile time compute as much as possible?

[dsherret]

I was looking at the code for WriteJs/JsWriter and I believe we could use a proc macro to turn this:

keyword!("import")

into...

{
  const VALUE = PreComputedText {
    text: "import",
    line_count: 0,
    last_line_char_count: 6,
  };
  self.wr.write_precomputed(&VALUE);
}

This would avoid having to do any calculations for stuff at runtime that's known at compile time and improve the source map emit's performance.

[kdy1]

Can you profile it? I think rustc will optimize it