That is not true at all! Flow was announced November 18, 2014: https://code.facebook.com/posts/1505962329687926/flow-a-new-static-type-checker-for-javascript/

That is not true at all! Flow was announced November 18, 2014: https://code.facebook.com/posts/1505962329687926/flow-a-new-static-type-checker-for-javascript/ https://code.facebook.com/posts/1505962329687926/flow-a-new-... Typescript got --strictNullChecks with Version 2 which was announced July 11, 2016: https://blogs.msdn.microsoft.com/typescript/2016/07/11/announcing-typescript-2-0-beta/ https://blogs.msdn.microsoft.com/typescript/2016/07/11/annou... Even if I'm being charitable and look for the date when the PR (https://github.com/Microsoft/TypeScript/pull/7140 https://github.com/Microsoft/TypeScript/pull/7140) was merged, we'd only get April 2016.