navigator.mimeTypes type definition problem in lib.es2016.full.d.ts #26502

TypeScript Version: 3.1.0-dev.20180813

Search Terms: navigator.mimeTypes

Code

http://www.typescriptlang.org/play/index.html#src=var%20a%3A%20Plugin%20%3D%20navigator.mimeTypes%5B0%5D%0D%0Avar%20b%3A%20MimeType%20%3D%20a%5B0%5D%3B%0D%0A%0D%0Aconsole.log(b.type)

Expected behavior:

I expected MimeTypeArray object which contains a list of MimeType objects representing the MIME types recognized by the browser. This one is right in TypeScript.

Reference: NavigatorPlugins.mimeTypes - Web APIs | MDN

When I get an array item in the navigator.mimeTypes, such as navigator.mimeTypes[0]. TypeScript should reference to MimeType, but it reference to a Plugin type and then Plugin's reference is also different from MDN docs.

Actual behavior:

Playground Link:
http://www.typescriptlang.org/play/index.html#src=var%20a%20%3D%20navigator.mimeTypes%5B0%5D%3B%0D%0Avar%20b%20%3D%20a%5B0%5D%3B%0D%0A%0D%0Aconsole.log(b.type)%3B%0D%0A%0D%0A%0D%0A

Related Issues:
N/A