jest-community/jest-extended

Health v2 · maintenance only

Adoption not part of the score

2350 stars · 227 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

jest-extended is a TypeScript library that adds many additional assertion matchers to Jest's expect API, covering arrays, strings, numbers, objects, dates, mocks, promises, and more. It is community-maintained under the jest-community organization and distributed via npm.

Use cases

• assert array contents more precisely in jest tests
• check if a value is a string, number, or boolean in tests
• test that a mock was called before another mock
• assert date comparisons like before, after, or between ranges
• verify object keys and values in jest assertions
• test that a promise resolves or rejects
• write more readable tdd assertions in jest

When to choose

• you use Jest and find its built-in matchers too limited for your assertions
• you want expressive, readable matchers for common data types without writing custom ones
• you need mock call-order assertions or promise resolution checks

When to avoid

• you use a test framework other than Jest or Vitest
• you only need a handful of matchers and prefer writing custom ones
• your project cannot add dev dependencies

Facets

library · maturity active

testing e2e-testing developer-tools testing developer-tools cross-platform jest matchers assertions tdd unit-testing typescript javascript nodejs

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