.eslintrc.json

{
  // My eslint.json for typescript
  // https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/parser

  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "./tsconfig.json"
    // For global install of eslint:
    // "project": "tsconfig.json"
    // "tsconfigRootDir": "c:/dev/gcpAdmin/functions/" // otherwise it looks for it in global folder (since I'm using global eslint)
    // https://github.com/typescript-eslint/typescript-eslint/issues/251 (see my comment)
  },

  "plugins": ["@typescript-eslint"],

  "env" : {
    "node": true
  },

  "extends": [
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/src/configs/recommended.json
    "plugin:@typescript-eslint/recommended"
    // Above is the simpler group; the next one are separate only because they require processing (slower)
    // "plugin:@typescript-eslint/recommended-requiring-type-checking"
  ],

  "rules": {

    // Copied from my JS eslint.
    "max-len" : ["warn", {
      "code": 120,
      "comments": 120,
      "ignoreTrailingComments": true,
      "ignoreUrls": true
    } ],   // eslint def = 80, but airbnb = 100

    // To change indent you must disable the base rule as it can report incorrect errors
    // "indent": "off",
    // "@typescript-eslint/indent": ["warn", 2],


    // My rules selection is based on info here
    // https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/eslint-plugin#supported-rules
    // As of 2019-03-21

    // --- Rules included in Recommended config ---
    
    "@typescript-eslint/no-use-before-define": "off",
    // "@typescript/no-use-before-define": ["error", {"functions": false, "typedefs": false}]

    "@typescript-eslint/no-explicit-any": "off",
    
    // explicit-member-accessibility - included in recommended (as error).
    // Should I turn this off (and just allow lots of defaulting to 'public')?
    "@typescript-eslint/explicit-member-accessibility": "warn", // default appears to be "error"

    // --- Rules not included in Recommended config ---

    "@typescript-eslint/no-for-in-array": "warn",

    "@typescript-eslint/no-this-alias": "warn",

    // Type aliasing is an advanced TS technique; I'm not sure about this one.
    "@typescript-eslint/no-type-alias": "warn",

    "@typescript-eslint/no-unnecessary-qualifier": "warn",

    // Not sure
    "@typescript-eslint/no-unnecessary-type-assertion": "warn",

    "@typescript-eslint/restrict-plus-operands": "warn",
    
    "@typescript-eslint/unified-signatures": "warn",

    // I can't get the configuration right.  Wait until eslint-typescript has better documentation.
    /*
    // Severity should be one of the following: 0 = off, 1 = warn, 2 = error (you passed '{ default: [ true, { order: [Array], alphabetize: false } ] }
    // Member Ordering
    // Use Member group types (with scope, ignoring accessibility)
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/member-ordering.md#member-group-types-with-scope-ignoring-accessibility
    "@typescript-eslint/member-ordering": { "default" :
      [ "warn", { "order" : [
          // Fields
          "static-field", // = ['public-static-field', 'protected-static-field', 'private-static-field'])
          "instance-field", // = ['public-instance-field', 'protected-instance-field', 'private-instance-field'])
          // Constructors
          "constructor", // = ['public-constructor', 'protected-constructor', 'private-constructor'])
          // Methods
          "static-method", // = ['public-static-method', 'protected-static-method', 'private-static-method'])
          "instance-method" // = ['public-instance-method', 'protected-instance-method', 'private-instance-method']
        ],
        "alphabetize": false
      }
    ] }
    */


    // -- Relax some rules during development phase
    "@typescript-eslint/no-unused-vars" : "warn",
    "@typescript-eslint/no-inferrable-types" : "warn", // set to error in 'recommended' plugin.
    "prefer-const" : "warn",
    "no-multiple-empty-lines" : "warn"

  }
}