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Re:Office 365 is being completely rewritten in JavaScript by dspillett on Wednesday June 13, 2018 @05:50AM (#17301667)
> Surprised they didn’t opt for Typescript.

I assume that they have. Typescript compiles down to Javascript so the tweet is technically correct (written in TS, executed in JS) and there are many out there who won't have a clue what TS is but have at least some grasp of what JS is so JS was probably stated instead of TS to avoid confusion amongst the unwashed masses.

Re:Office 365 is being completely rewritten in JavaScript by sesutton on Wednesday June 13, 2018 @08:55AM (#17302563)
The tweet mentions Visual Studio Code which uses Typescript.