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triple-slash-reference

Disallow certain triple slash directives in favor of ES6-style import declarations.

✅

Extending "plugin:@typescript-eslint/recommended" in an ESLint configuration enables this rule.

TypeScript's /// triple-slash references are a way to indicate that types from another module are available in a file. Use of triple-slash reference type directives is generally discouraged in favor of ECMAScript Module imports. This rule reports on the use of /// <reference path="..." />, /// <reference types="..." />, or /// <reference lib="..." /> directives.

.eslintrc.cjs
module.exports = {
  "rules": {
    "@typescript-eslint/triple-slash-reference": "error"
  }
};
Try this rule in the playground ↗

Examples​

This rule accepts an options object with the following properties:

interface Options {
  lib?: "always" | "never";
  path?: "always" | "never";
  types?: "always" | "never" | "prefer-import";
}

const defaultOptions: Options = [
  { lib: "always", path: "never", types: "prefer-import" },
];

Options​

With { "path": "never", "types": "never", "lib": "never" } options set, the following will all be incorrect usage:

/// <reference path="foo" />
/// <reference types="bar" />
/// <reference lib="baz" />

Examples of incorrect code for the { "types": "prefer-import" } option. Note that these are only errors when both styles are used for the same module:

/// <reference types="foo" />
import * as foo from 'foo';
/// <reference types="foo" />
import foo = require('foo');

With { "path": "always", "types": "always", "lib": "always" } options set, the following will all be correct usage:

/// <reference path="foo" />
/// <reference types="bar" />
/// <reference lib="baz" />

Examples of correct code for the { "types": "prefer-import" } option:

import * as foo from 'foo';
import foo = require('foo');

When To Use It​

If you want to ban use of one or all of the triple slash reference directives, or any time you might use triple-slash type reference directives and ES6 import declarations in the same file.

When Not To Use It​

If you want to use all flavors of triple slash reference directives.

Resources​