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// replace any ${ENV} values with the appropriate environ.

const envExpr = /(\\*)\$\{([^}]+)\}/g

module.exports = (f, env) => f.replace(envExpr, (orig, esc, name) => {
  const val = env[name] !== undefined ? env[name] : `\$\{${name}\}`

  // consume the escape chars that are relevant.
  if (esc.length % 2)
    return orig.substr((esc.length + 1) / 2)

  return (esc.substr(esc.length / 2)) + val
})