source: imaps-frontend/node_modules/is-bigint/test/index.js@ 79a0317

'use strict';

var test = require('tape');
var inspect = require('object-inspect');
var hasBigInts = require('has-bigints')();
var hasToStringTag = require('has-tostringtag/shams')();
var forEach = require('for-each');
var v = require('es-value-fixtures');

var isBigInt = require('../');

test('non-BigInt values', function (t) {
        /** @type {(typeof v.primitives[number] | object)[]} */
        var nonBigInts = v.nonBigInts.concat(
                Object(true),
                Object(false),
                // @ts-expect-error TS sucks with concat
                {},
                [],
                /a/g,
                new Date(),
                function () {},
                NaN,
                v.symbols
        );
        t.plan(nonBigInts.length);
        forEach(nonBigInts, function (nonBigInt) {
                t.equal(false, isBigInt(nonBigInt), inspect(nonBigInt) + ' is not a BigInt');
        });
        t.end();
});

test('faked BigInt values', function (t) {
        t.test('real BigInt valueOf', { skip: !hasBigInts }, function (st) {
                var fakeBigInt = { valueOf: function () { return BigInt(42); } };
                st.equal(false, isBigInt(fakeBigInt), 'object with valueOf returning a BigInt is not a BigInt');
                st.end();
        });

        t.test('faked @@toStringTag', { skip: !hasBigInts || !hasToStringTag }, function (st) {
                /** @type {{ valueOf(): unknown; [Symbol.toStringTag]?: unknown }} */
                var fakeBigInt = { valueOf: function () { return BigInt(42); } };
                fakeBigInt[Symbol.toStringTag] = 'BigInt';
                st.equal(false, isBigInt(fakeBigInt), 'object with fake BigInt @@toStringTag and valueOf returning a BigInt is not a BigInt');

                /** @type {{ valueOf(): unknown; [Symbol.toStringTag]?: unknown }} */
                var notSoFakeBigInt = { valueOf: function () { return 42; } };
                notSoFakeBigInt[Symbol.toStringTag] = 'BigInt';
                st.equal(false, isBigInt(notSoFakeBigInt), 'object with fake BigInt @@toStringTag and valueOf not returning a BigInt is not a BigInt');
                st.end();
        });

        var fakeBigIntString = { toString: function () { return '42n'; } };
        t.equal(false, isBigInt(fakeBigIntString), 'object with toString returning 42n is not a BigInt');

        t.end();
});

test('BigInt support', { skip: !hasBigInts }, function (t) {
        forEach(v.bigints.concat(Object(BigInt(42))), function (bigInt) {
                t.equal(true, isBigInt(bigInt), inspect(bigInt) + ' is a BigInt');
        });

        t.end();
});