Current File : /var/www/html/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();
});
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