89 lines
2.8 KiB
JavaScript
89 lines
2.8 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var forEach = require('for-each');
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var v = require('es-value-fixtures');
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var isSymbol = require('../index');
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var hasSymbols = require('has-symbols')();
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var hasToStringTag = require('has-tostringtag/shams')();
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var inspect = require('object-inspect');
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test('non-symbol values', function (t) {
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var nonSymbols = v.nonSymbolPrimitives.concat(
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Object(true),
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Object(false),
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// @ts-expect-error TS sucks with concat
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{},
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[],
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/a/g,
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new Date(),
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function () {},
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NaN
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);
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t.plan(nonSymbols.length);
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forEach(nonSymbols, function (nonSymbol) {
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t.equal(isSymbol(nonSymbol), false, inspect(nonSymbol) + ' is not a symbol');
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});
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t.end();
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});
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test('faked symbol values', function (t) {
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t.test('real symbol valueOf', { skip: !hasSymbols }, function (st) {
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var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
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st.equal(isSymbol(fakeSymbol), false, 'object with valueOf returning a symbol is not a symbol');
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st.end();
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});
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t.test('faked @@toStringTag', { skip: !hasToStringTag }, function (st) {
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/** @type {{ valueOf(): unknown; [Symbol.toStringTag]?: unknown }} */
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var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
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fakeSymbol[Symbol.toStringTag] = 'Symbol';
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st.equal(isSymbol(fakeSymbol), false, 'object with fake Symbol @@toStringTag and valueOf returning a symbol is not a symbol');
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/** @type {{ valueOf(): unknown; [Symbol.toStringTag]?: unknown }} */
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var notSoFakeSymbol = { valueOf: function () { return 42; } };
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notSoFakeSymbol[Symbol.toStringTag] = 'Symbol';
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st.equal(isSymbol(notSoFakeSymbol), false, 'object with fake Symbol @@toStringTag and valueOf not returning a symbol is not a symbol');
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st.end();
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});
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var fakeSymbolString = { toString: function () { return 'Symbol(foo)'; } };
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t.equal(isSymbol(fakeSymbolString), false, 'object with toString returning Symbol(foo) is not a symbol');
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t.end();
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});
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test('Symbol support', { skip: !hasSymbols }, function (t) {
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t.test('well-known Symbols', function (st) {
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/** @type {(name: string) => name is Exclude<keyof SymbolConstructor, 'for' | 'keyFor'>} */
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var isWellKnown = function filterer(name) {
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return name !== 'for' && name !== 'keyFor' && !(name in filterer);
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};
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var wellKnownSymbols = Object.getOwnPropertyNames(Symbol).filter(isWellKnown);
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wellKnownSymbols.forEach(function (name) {
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// eslint-disable-next-line no-extra-parens
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var sym = Symbol[/** @type {keyof SymbolConstructor} */ (name)];
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st.equal(isSymbol(sym), true, inspect(sym) + ' is a symbol');
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});
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st.end();
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});
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t.test('user-created symbols', function (st) {
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var symbols = v.symbols.concat(
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Symbol(),
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Symbol('foo'),
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Symbol['for']('foo'),
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Object(Symbol('object'))
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);
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symbols.forEach(function (sym) {
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st.equal(isSymbol(sym), true, inspect(sym) + ' is a symbol');
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});
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st.end();
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});
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t.end();
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});
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