(This rule is specific to DefinitelyTyped.)
Avoid using <reference path>.
Bad:
/// <reference path="../node_modules/@types/foo/index.d.ts" />
import * as foo from "foo";Good:
If "foo" is written in external module style (see no-single-declare-module), the import alone should work thanks to module resolution:
// TypeScript will look for a definition for "foo" using module resolution
import * as foo from "foo";If not, use <reference types> instead:
/// <reference types="foo" />The only time <reference path> should be necessary if for global (not module) libraries that are separated into multiple files; the index file must include references to the others to bring them into the compilation.