@types/chai
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The @types/chai package provides TypeScript type definitions for Chai, a BDD / TDD assertion library for node and the browser. This allows developers to use Chai in TypeScript projects with type checking and IntelliSense support in code editors.
Expect/Should Assertions
Provides fluent API for asserting facts about values in a readable manner. Supports both 'expect' and 'should' styles.
expect(foo).to.be.a('string');
expect(foo).to.equal('bar');
expect(foo).to.have.lengthOf(3);
should.exist(foo);
foo.should.be.a('string');
foo.should.equal('bar');Assert Style
Enables a more classical assert style, similar to node's assert module but with more capabilities.
assert.typeOf(foo, 'string');
assert.equal(foo, 'bar');
assert.lengthOf(foo, 3);Property Assertions
Allows asserting the existence of an object's property, optionally asserting its value or properties.
expect(foo).to.have.property('length').with.lengthOf(3);
foo.should.have.property('length').with.lengthOf(3);Provides TypeScript definitions for Jest, a testing framework with a focus on simplicity. While Jest comes with its own assertion library, it's more tightly integrated with its testing environment compared to Chai, which is assertion library agnostic.
Offers TypeScript definitions for Mocha, a feature-rich JavaScript test framework running on Node.js and in the browser. Mocha itself is more about the test framework rather than assertions, and it's often used in combination with Chai.
Supplies TypeScript definitions for Sinon, a standalone test spies, stubs, and mocks for JavaScript. While not an assertion library, Sinon is commonly used alongside Chai for behavior verification in tests.
npm install --save @types/chai
This package contains type definitions for chai (http://chaijs.com/).
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/chai/v4.
These definitions were written by Bart van der Schoor, Andrew Brown, Olivier Chevet, Matt Wistrand, Shaun Luttin, Satana Charuwichitratana, Erik Schierboom, Bogdan Paranytsia, CXuesong, and Joey Kilpatrick.
FAQs
TypeScript definitions for chai
The npm package @types/chai receives a total of 3,988,923 weekly downloads. As such, @types/chai popularity was classified as popular.
We found that @types/chai demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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