Josh Goldberg 08c6dc99c6 "tsc --watch should clear screen on new compilation" Two: Electric Boogaloo (#20389)
* tsc --watch should clear screen on new compilation

* added optional clearScreen method to System]
* implemented via `x1Bc`, reset screen
* fixes 13020

* Feedback on if statements; api .d.ts baseline additions

* Stopped clearing screen in tsc.js's reportWatchMode

* Added unit tests
2017-12-02 11:11:49 -08:00
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