minify-html 0.16.4

use crate::cfg::Cfg;
use minify_html_common::whitespace::trimmed;
use minify_js::minify as minifier;
use minify_js::Session;
use minify_js::TopLevelMode;

pub fn minify_js(cfg: &Cfg, mode: TopLevelMode, out: &mut Vec<u8>, code: &[u8]) {
  if cfg.minify_js {
    // TODO Write to `out` directly, but only if we can guarantee that the length will never exceed the input.
    let mut output = Vec::new();
    let session = Session::new();
    let result = minifier(&session, mode, code, &mut output);
    // TODO Collect error as warning.
    if result.is_ok() && output.len() < code.len() {
      out.extend_from_slice(output.as_slice());
      return;
    };
  }
  out.extend_from_slice(trimmed(code));
}