Don't use a default import of a package that uses export =.
Users who do not have --allowSyntheticDefaultExports or --esModuleInterop will get different behavior.
This rule only applies to definition files -- for test files you can use a default import if you prefer.
Bad:
// foo/index.d.ts
declare interface I {}
export = I;
// bar/index.d.ts
import I from "foo";Good:
import I = require("foo");