index.js

/* eslint node/no-deprecated-api: [error, {ignoreGlobalItems: ["require.extensions"]}] */

"use strict";

const path = require("path");
const espowerSource = require("espower-source");
const minimatch = require("minimatch");
const sourceMapSupport = require("source-map-support");
const tsNodeRegister = require("ts-node").register;
const sourceCache = {};

function espowerTypeScript(options, tsNodeOptions) {
  tsNodeRegister(tsNodeOptions);

  // install source-map-support again to correct the source-map
  sourceMapSupport.install({
    environment: "node",
    retrieveFile: (path) => sourceCache[path],
  });

  const { extensions = ["ts", "tsx"] } = options;
  extensions.forEach((ext) => {
    espowerTsRegister(`.${ext}`, options);
  });
}

function espowerTsRegister(ext, options) {
  const cwd = options.cwd || process.cwd();
  const pattern = path.join(cwd, options.pattern);

  const originalExtension = require.extensions[ext];
  require.extensions[ext] = (module, filepath) => {
    if (!minimatch(filepath, pattern)) {
      return originalExtension(module, filepath);
    }
    const originalCompile = module._compile;
    module._compile = function (code, filepath) {
      const newSource = espowerSource(code, filepath, options);
      sourceCache[filepath] = newSource;
      return originalCompile.call(this, newSource, filepath);
    };
    return originalExtension(module, filepath);
  };
}

module.exports = espowerTypeScript;