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Add is.directInstanceOf() (#38)

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Brandon Smith 2017-12-09 11:55:08 -05:00 • committed by GitHub
parent 4ce2ee9d39
commit 70b08940be
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4
source/index.ts
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@ -162,6 +162,10 @@ namespace is { // tslint:disable-line:no-namespace
export const arrayBuffer = isObjectOfType(TypeName.ArrayBuffer);
export const sharedArrayBuffer = isObjectOfType(TypeName.SharedArrayBuffer);
// TODO: Remove `object` checks when targeting ES2015 or higher
// See `Notes`: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf
export const directInstanceOf = (instance: any, klass: any) => object(instance) && object(klass) && Object.getPrototypeOf(instance) === klass.prototype;
export const truthy = (value: any) => Boolean(value);
export const falsy = (value: any) => !value;

11
source/tests/test.ts
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@ -507,6 +507,17 @@ test('is.dataView', t => {
testType(t, 'arrayBuffer');
});
test('is.directInstanceOf', t => {
const error = new Error();
const errorSubclass = new ErrorSubclassFixture();
t.true(m.directInstanceOf(error, Error));
t.true(m.directInstanceOf(errorSubclass, ErrorSubclassFixture));
t.false(m.directInstanceOf(error, ErrorSubclassFixture));
t.false(m.directInstanceOf(errorSubclass, Error));
});
test('is.truthy', t => {
t.true(m.truthy('unicorn'));
t.true(m.truthy('🦄'));