index.js 2.2 KB

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  1. 'use strict';
  2. var test = require('tape');
  3. var hasToStringTag = require('has-tostringtag/shams')();
  4. var inspect = require('object-inspect');
  5. var isBoolean = require('../');
  6. test('not Booleans', function (t) {
  7. t.test('primitives', function (st) {
  8. // @ts-expect-error
  9. st.notOk(isBoolean(), 'undefined is not Boolean');
  10. st.notOk(isBoolean(null), 'null is not Boolean');
  11. st.notOk(isBoolean(0), '0 is not Boolean');
  12. st.notOk(isBoolean(NaN), 'NaN is not Boolean');
  13. st.notOk(isBoolean(Infinity), 'Infinity is not Boolean');
  14. st.notOk(isBoolean('foo'), 'string is not Boolean');
  15. st.end();
  16. });
  17. t.test('objects', function (st) {
  18. st.notOk(isBoolean(Object(42)), 'number object is not Boolean');
  19. st.notOk(isBoolean([]), 'array is not Boolean');
  20. st.notOk(isBoolean({}), 'object is not Boolean');
  21. st.notOk(isBoolean(function () {}), 'function is not Boolean');
  22. st.notOk(isBoolean(/a/g), 'regex literal is not Boolean');
  23. st.notOk(isBoolean(new RegExp('a', 'g')), 'regex object is not Boolean');
  24. st.notOk(isBoolean(new Date()), 'new Date() is not Boolean');
  25. st.end();
  26. });
  27. t.end();
  28. });
  29. test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
  30. /** @type {{ toString(): unknown; valueOf(): unknown; [Symbol.toStringTag]?: string; }} */
  31. var fakeBoolean = {
  32. toString: function () { return 'true'; },
  33. valueOf: function () { return true; }
  34. };
  35. fakeBoolean[Symbol.toStringTag] = 'Boolean';
  36. t.notOk(isBoolean(fakeBoolean), 'fake Boolean with @@toStringTag "Boolean" is not Boolean');
  37. t.end();
  38. });
  39. test('Booleans', function (t) {
  40. t.ok(isBoolean(true), 'true is Boolean');
  41. t.ok(isBoolean(false), 'false is Boolean');
  42. t.ok(isBoolean(Object(true)), 'Object(true) is Boolean');
  43. t.ok(isBoolean(Object(false)), 'Object(false) is Boolean');
  44. t.end();
  45. });
  46. test('Proxy', { skip: typeof Proxy !== 'function' || !hasToStringTag }, function (t) {
  47. /** @type {Record<PropertyKey, unknown>} */
  48. var target = {};
  49. target[Symbol.toStringTag] = 'Boolean';
  50. var fake = new Proxy(target, { has: function () { return false; } });
  51. t.equal(
  52. isBoolean(target),
  53. false,
  54. inspect(target) + ' is not a Boolean'
  55. );
  56. t.equal(
  57. isBoolean(fake),
  58. false,
  59. inspect(fake) + ' is not a Boolean'
  60. );
  61. t.end();
  62. });