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

'use strict';

var test = require('tape');
var inspect = require('object-inspect');
var hasBigInts = require('has-bigints')();
var hasSymbols = require('has-symbols')();
var hasToStringTag = require('has-tostringtag/shams')();

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

var debug = function (v, m) { return inspect(v) + ' ' + m; };

var forEach = function (arr, func) {
        var i;
        for (i = 0; i < arr.length; ++i) {
                func(arr[i], i, arr);
        }
};

test('non-BigInt values', function (t) {
        var nonBigInts = [
                true,
                false,
                Object(true),
                Object(false),
                null,
                undefined,
                {},
                [],
                /a/g,
                'string',
                42,
                new Date(),
                function () {},
                NaN
        ];
        if (hasSymbols) {
                nonBigInts.push(Symbol.iterator, Symbol('foo'));
        }
        t.plan(nonBigInts.length);
        forEach(nonBigInts, function (nonBigInt) {
                t.equal(false, isBigInt(nonBigInt), debug(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) {
                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');

                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([
                Function('return 42n')(), // eslint-disable-line no-new-func
                BigInt(42),
                Object(BigInt(42))
        ], function (bigInt) {
                t.equal(true, isBigInt(bigInt), debug(bigInt, 'is a BigInt'));
        });

        t.end();
});