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index.js 2.1KB

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  1. /**
  2. * @fileoverview Main entrypoint for libraries using yargs-parser in Node.js
  3. * CJS and ESM environments.
  4. *
  5. * @license
  6. * Copyright (c) 2016, Contributors
  7. * SPDX-License-Identifier: ISC
  8. */
  9. import { format } from 'util';
  10. import { readFileSync } from 'fs';
  11. import { normalize, resolve } from 'path';
  12. import { camelCase, decamelize, looksLikeNumber } from './string-utils.js';
  13. import { YargsParser } from './yargs-parser.js';
  14. // See https://github.com/yargs/yargs-parser#supported-nodejs-versions for our
  15. // version support policy. The YARGS_MIN_NODE_VERSION is used for testing only.
  16. const minNodeVersion = (process && process.env && process.env.YARGS_MIN_NODE_VERSION)
  17. ? Number(process.env.YARGS_MIN_NODE_VERSION)
  18. : 10;
  19. if (process && process.version) {
  20. const major = Number(process.version.match(/v([^.]+)/)[1]);
  21. if (major < minNodeVersion) {
  22. throw Error(`yargs parser supports a minimum Node.js version of ${minNodeVersion}. Read our version support policy: https://github.com/yargs/yargs-parser#supported-nodejs-versions`);
  23. }
  24. }
  25. // Creates a yargs-parser instance using Node.js standard libraries:
  26. const env = process ? process.env : {};
  27. const parser = new YargsParser({
  28. cwd: process.cwd,
  29. env: () => {
  30. return env;
  31. },
  32. format,
  33. normalize,
  34. resolve,
  35. // TODO: figure out a way to combine ESM and CJS coverage, such that
  36. // we can exercise all the lines below:
  37. require: (path) => {
  38. if (typeof require !== 'undefined') {
  39. return require(path);
  40. }
  41. else if (path.match(/\.json$/)) {
  42. return readFileSync(path, 'utf8');
  43. }
  44. else {
  45. throw Error('only .json config files are supported in ESM');
  46. }
  47. }
  48. });
  49. const yargsParser = function Parser(args, opts) {
  50. const result = parser.parse(args.slice(), opts);
  51. return result.argv;
  52. };
  53. yargsParser.detailed = function (args, opts) {
  54. return parser.parse(args.slice(), opts);
  55. };
  56. yargsParser.camelCase = camelCase;
  57. yargsParser.decamelize = decamelize;
  58. yargsParser.looksLikeNumber = looksLikeNumber;
  59. export default yargsParser;