Track missing type coverage in TypeScript projects to ensure type safety

👉 track type coverage defined as the count of symbols whose type is not any / the total count of symbols
👉 display type coverage directly in GitHub
👉 set minimal type coverage and automatically fail PRs
👉 supports monorepos

Despite using --strict mode in tsconfig you can still have anys in your codebase. This tool gives you a good overview if PR that you are going to merge increases or decreases overall type coverage and where exactly types should be improved.

npm install --save-dev typecov

TypeCov is built on CodeChecks.io - open source code review automation platform.

Are you new to codechecks? Check out getting started guide (it's simple)!

Install package and then add to your codechecks.yml file:

checks:
  - name: typecov
    options:
      # atLeast: 99
      # name: webapp
      # tsconfigPath: ./tsconfig.prod.json

Under the hood it uses type-coverage package.

interface Options {
  name?: string; // will be added to check name
  tsconfigPath?: string; //defaults to tsconfig.json
  atLeast?: number;
  ignoreFiles?: string[];
  ignoreCatch?: boolean;
  strict?: boolean;
}

optional string
Defaults: Type Coverage
Specify the name for check. Might be useful in monorepos.

optional string
Default: tsconfig.json
Path to typescript project configuration

optional number
Defaults: undefined
Example: atLeast: 99
Fail if coverage rate < this value.

optional string[]
Defaults: undefined
Specify the ignored for checks files. See type-coverage's description for the reference.

optional string
Defaults: undefined
See type-coverage's description for the reference.

optional string
Defaults: undefined
See type-coverage's description for the reference.

All contributions are welcomed. Read more in CONTRIBUTING.md

MIT @ codechecks.io