// https://github.com/igoradamenko/esbuild-plugin-alias/blob/master/index.js
// MIT License. Copyright (c) 2021 Igor Adamenko
import type { Plugin } from "esbuild"

export function alias(options: Record<string, string>): Plugin {
  const aliases = Object.keys(options)
  const re = new RegExp(`^(${aliases.map(x => escapeRegExp(x)).join("|")})$`)

  return {
    name: "alias",
    setup(build) {
      // we do not register 'file' namespace here, because the root file won't be processed
      // https://github.com/evanw/esbuild/issues/791
      build.onResolve({ filter: re }, args => ({
        path: options[args.path],
      }))
    },
  }
}

function escapeRegExp(string: string) {
  // $& means the whole matched string
  return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")
}