Function startInternal

src/repl.ts:325–437

(
    options?: ReplOptions & { code?: string; forceToBeModule?: boolean }
  )

  // Note: `code` argument is deprecated
  function startInternal(
    options?: ReplOptions & { code?: string; forceToBeModule?: boolean }
  ) {
    const { code, forceToBeModule = true, ...optionsOverride } = options ?? {};
    // TODO assert that `service` is set; remove all `service!` non-null assertions

    // Eval incoming code before the REPL starts.
    // Note: deprecated
    if (code) {
      try {
        evalCode(`${code}\n`);
      } catch (err) {
        _console.error(err);
        // Note: should not be killing the process here, but this codepath is deprecated anyway
        process.exit(1);
      }
    }

    // In case the typescript compiler hasn't compiled anything yet,
    // make it run though compilation at least one time before
    // the REPL starts for a snappier user experience on startup.
    service?.compile('', state.path);

    const repl = nodeReplStart({
      prompt: '> ',
      input: replService.stdin,
      output: replService.stdout,
      // Mimicking node's REPL implementation: https://github.com/nodejs/node/blob/168b22ba073ee1cbf8d0bcb4ded7ff3099335d04/lib/internal/repl.js#L28-L30
      terminal:
        (stdout as tty.WriteStream).isTTY &&
        !parseInt(env.NODE_NO_READLINE!, 10),
      eval: nodeEval,
      useGlobal: true,
      ...optionsOverride,
    });

    nodeReplServer = repl;
    context = repl.context;

    // Bookmark the point where we should reset the REPL state.
    const resetEval = appendToEvalState(state, '');

    function reset() {
      resetEval();

      // Hard fix for TypeScript forcing `Object.defineProperty(exports, ...)`.
      runInContext('exports = module.exports', state.path, context);
      if (forceToBeModule) {
        state.input += 'export {};void 0;\n';
      }

      // Declare node builtins.
      // Skip the same builtins as `addBuiltinLibsToObject`:
      //   those starting with _
      //   those containing /
      //   those that already exist as globals
      // Intentionally suppress type errors in case @types/node does not declare any of them, and because
      // `declare import` is technically invalid syntax.