Microsoft is backing a proposal to bring optional and erasable type syntax to JavaScript, potentially making the company’s TypeScript language, which builds on JavaScript, faster and easier to use.

The export type syntax only provides an export to be used for type contexts and is erased from TypeScript output. TypeScript has used JavaScript’s import syntax to enable reference types.

Microsoft has backed a proposal to bring optional and erasable type syntax to JavaScript in an effort to make its TypeScript language both faster and easier to use.