html-minifier-terser/src/utils.js

Highly configurable, well-tested, JavaScript-based HTML minifier.

export async function replaceAsync(str, regex, asyncFn) {
  const promises = [];

  str.replace(regex, (match, ...args) => {
    const promise = asyncFn(match, ...args);
    promises.push(promise);
  });

  const data = await Promise.all(promises);
  return str.replace(regex, () => data.shift());
}