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  1. # is-data-view <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
  2. [![github actions][actions-image]][actions-url]
  3. [![coverage][codecov-image]][codecov-url]
  4. [![License][license-image]][license-url]
  5. [![Downloads][downloads-image]][downloads-url]
  6. [![npm badge][npm-badge-png]][package-url]
  7. Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
  8. ## Example
  9. ```js
  10. var isDataView = require('is-data-view');
  11. var assert = require('assert');
  12. assert.equal(false, isDataView(undefined));
  13. assert.equal(false, isDataView(null));
  14. assert.equal(false, isDataView(false));
  15. assert.equal(false, isDataView(true));
  16. assert.equal(false, isDataView([]));
  17. assert.equal(false, isDataView({}));
  18. assert.equal(false, isDataView(/a/g));
  19. assert.equal(false, isDataView(new RegExp('a', 'g')));
  20. assert.equal(false, isDataView(new Date()));
  21. assert.equal(false, isDataView(42));
  22. assert.equal(false, isDataView(NaN));
  23. assert.equal(false, isDataView(Infinity));
  24. assert.equal(false, isDataView(new Number(42)));
  25. assert.equal(false, isDataView('foo'));
  26. assert.equal(false, isDataView(Object('foo')));
  27. assert.equal(false, isDataView(function () {}));
  28. assert.equal(false, isDataView(function* () {}));
  29. assert.equal(false, isDataView(x => x * x));
  30. assert.equal(false, isDataView([]));
  31. assert.equal(false, isDataView(new Int8Array()));
  32. assert.equal(false, isDataView(new Uint8Array()));
  33. assert.equal(false, isDataView(new Uint8ClampedArray()));
  34. assert.equal(false, isDataView(new Int16Array()));
  35. assert.equal(false, isDataView(new Uint16Array()));
  36. assert.equal(false, isDataView(new Int32Array()));
  37. assert.equal(false, isDataView(new Uint32Array()));
  38. assert.equal(false, isDataView(new Float32Array()));
  39. assert.equal(false, isDataView(new Float64Array()));
  40. assert.equal(false, isDataView(new BigInt64Array()));
  41. assert.equal(false, isDataView(new BigUint64Array()));
  42. assert.ok(isDataView(new DataView(new ArrayBuffer(0))));
  43. ```
  44. ## Tests
  45. Simply clone the repo, `npm install`, and run `npm test`
  46. [package-url]: https://npmjs.org/package/is-data-view
  47. [npm-version-svg]: https://versionbadg.es/inspect-js/is-data-view.svg
  48. [deps-svg]: https://david-dm.org/inspect-js/is-data-view.svg
  49. [deps-url]: https://david-dm.org/inspect-js/is-data-view
  50. [dev-deps-svg]: https://david-dm.org/inspect-js/is-data-view/dev-status.svg
  51. [dev-deps-url]: https://david-dm.org/inspect-js/is-data-view#info=devDependencies
  52. [npm-badge-png]: https://nodei.co/npm/is-data-view.png?downloads=true&stars=true
  53. [license-image]: https://img.shields.io/npm/l/is-data-view.svg
  54. [license-url]: LICENSE
  55. [downloads-image]: https://img.shields.io/npm/dm/is-data-view.svg
  56. [downloads-url]: https://npm-stat.com/charts.html?package=is-data-view
  57. [codecov-image]: https://codecov.io/gh/inspect-js/is-data-view/branch/main/graphs/badge.svg
  58. [codecov-url]: https://app.codecov.io/gh/inspect-js/is-data-view/
  59. [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-data-view
  60. [actions-url]: https://github.com/inspect-js/is-data-view/actions