mustache.js/.esmrc

{
  cjs: {
    // Ensure ESM `export default` ends up as the root, e.g. `module.exports` when
    // being `require()`d from CJS code. This is not spec compliant, but that does
    // not matter because only use this `esm` package trickery locally while testing
    dedefault: true
  }
}