no-missing-types.md

no-missing-types

Ensures that any pacakges used has Typescript definitions (either included in the package itself, or installed as a separate @types-scoped dependency)

NOTE: Packages containing their own types do not require any supporting @types-scoped packages to be installed (e.g., axios).

**Bad**:

lodash is used without installing @types/lodash:

{
  "dependencies": {
    "lodash": "~4.17.0"
  }
}

**Good**:

@types/lodash is included as dev-depdendency, providing types for the lodash package:

{
  "dependencies": {
    "lodash": "~4.17.0"
  },
  "devDependencies": {
    "@types/lodash": "~4.14.0"
  }
}

Options

• excludePatterns: string[]: Tells this rule to ignore packages matching the given patterns. Might be useful for a custom jest-reporter or an ESLint plugin that doesn't have any types exposed.