Optional chaining is very close to standardized! But y'know, feel free to use TypeScript anyway. 
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I started working on optional chaining in December of 2016, super excited to see it landing in TypeScript!pic.twitter.com/8PY1OH7qNa
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This 100%. Chaining and Coalescing would have justified calling it 4.0 for me

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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Guess who's gonna update some dependencies instead of fixing "urgent bugs" tomorrow.pic.twitter.com/d13BrxqH9i
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Same!
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Amazing release! You all absolutely nailed it in DX this iteration. I think optional chaining and null coalescing are going to make strict mode an easier sell for people who were on the fence. Coupled with the better control flow analysis—this will help us write better code.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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We celebrated Typescript release on our office at
@realtordotcompic.twitter.com/cknvJp6mwJ
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Optional Chaining & Coalescing