prettify-js

A fast, robust but imperfect token-based JS code prettifier, written in Rust, that outputs JS source maps.

The code was mostly ported from Mozilla's pretty-fast. Instead of using Acorn to tokenize, we use RESS. Instead of using the source-map package to generate source maps, we use our own very minimal handwritten source-map emitter. The original pretty-fast code tries to avoid emitting more than one source-map record per pretty line; instead we emit one source-map record per token, because we sometimes care about code offsets within a pretty line.

lib.rs:

prettify-js is a tokenizer-based JS prettyprinter that generates source maps.

Example:

let (pretty, _) = prettify_js::prettyprint("function x(a){return a;}");
assert_eq!(pretty, "function x(a) {\n  return a;\n}\n");