node_options.ts

// Copyright 2018-2026 the Deno authors. MIT license.

import { primordials } from "ext:core/mod.js";
const {
  SafeMap,
  ArrayPrototypeForEach,
  ArrayPrototypePush,
  StringPrototypeSlice,
  StringPrototypeStartsWith,
} = primordials;

// This module ports:
// - https://github.com/nodejs/node/blob/master/src/node_options-inl.h
// - https://github.com/nodejs/node/blob/master/src/node_options.cc
// - https://github.com/nodejs/node/blob/master/src/node_options.h

// Quote-aware tokenizer for NODE_OPTIONS. Node.js uses a shell-like parser
// that respects single and double quotes, so `--title="hello world"` is a
// single token whose value is `hello world`, not two tokens.
function splitNodeOptions(input: string): string[] {
  const args: string[] = [];
  let current = "";
  let inDouble = false;
  let inSingle = false;

  for (let i = 0; i < input.length; i++) {
    const ch = input[i];
    if (ch === '"' && !inSingle) {
      inDouble = !inDouble;
    } else if (ch === "'" && !inDouble) {
      inSingle = !inSingle;
    } else if (
      (ch === " " || ch === "\t" || ch === "\n" || ch === "\r") && !inDouble &&
      !inSingle
    ) {
      if (current.length > 0) {
        ArrayPrototypePush(args, current);
        current = "";
      }
    } else {
      current += ch;
    }
  }
  if (current.length > 0) {
    ArrayPrototypePush(args, current);
  }
  return args;
}

/** Gets the all options for Node.js
 * This function is expensive to execute. `getOptionValue` in `internal/options.ts`
 * should be used instead to get a specific option. */
export function getOptions() {
  const options = new SafeMap([
    ["--warnings", { value: true }],
    ["--pending-deprecation", { value: false }],
    ["--title", { value: "" }],
  ]);

  const nodeOptions = Deno.env.get("NODE_OPTIONS");
  const args = nodeOptions ? splitNodeOptions(nodeOptions) : [];
  ArrayPrototypeForEach(args, (arg) => {
    if (StringPrototypeStartsWith(arg, "--title=")) {
      options.set("--title", { value: StringPrototypeSlice(arg, 8) });
      return;
    }
    switch (arg) {
      case "--no-warnings":
        options.set("--warnings", { value: false });
        break;
      case "--pending-deprecation":
        options.set("--pending-deprecation", { value: true });
        break;
      // TODO(kt3k): Handle other options.
      default:
        break;
    }
  });
  return { options };
}