salty-dog/rules/tsconfig.yml

name: salty-dog-tsconfig
rules:
  - name: allow-errors
    desc: do not suppress errors
    level: info
    tags:
      - tsconfig
      - errors

    select: '$.compilerOptions'
    check:
      not:
        anyOf:
          - required: [suppressExcessPropertyErrors]
          - required: [suppressImplicitAnyIndexErrors]

  - name: redundant-strict
    desc: omit redundant strict mode options
    level: info
    tags:
      - tsconfig
      - strict

    select: '$.compilerOptions'
    filter:
      type: object
      required: [strict]
      properties:
        strict:
          type: boolean
          const: true

    check:
      not:
        anyOf:
          # from https://www.typescriptlang.org/docs/handbook/compiler-options.html
          - required: [alwaysStrict]
          - required: [noImplicitAny]
          - required: [noImplicitThis]
          - required: [strictBindCallApply]
          - required: [strictNullChecks]
          - required: [strictFunctionTypes]
          - required: [strictPropertyInitialization]

  - name: target-lib
    desc: ensure the target and lib match
    level: info
    tags:
      - tsconfig
      - target

    select: '$.compilerOptions'
    filter:
      type: object
      required: [lib, target]
      properties:
        lib:
          type: array
        target:
          type: string
          pattern: "^es([0-9]+|next)$"

    check:
      allOf:
        - type: object
          required: [lib, target]
          properties:
            lib:
              type: array
              items:
                type: string
            target:
              type: string
        - oneOf:
            - properties:
                lib:
                  contains:
                    type: string
                    const:
                      $data: "2/target"
                target:
                  type: string
                  enum: [esnext, es2017, es2016, es5, es3]