* Lazily compute signature type predicates
* Use an instance of IdentifierTypePredicate to represent an unresolved type predicate
* Simplify `getMaybeTypePredicate`
* Invert representation of `resolvedTypePredicate`
* Remove `__unresolvedTypePredicate` type and remember to use `noTypePredicate` instead of `undefined` when in all `createSignature` calls
* Fix style of getTypePredicateOfSignature
* Use in createGetSymbolWalker
* Fix bugs for unions of type predicates
* Code review
* Make noTypePredicate purely an implementation detail of getTypePredictateOfSignature
* Add test
* Add test for #19642
* Add test with reversed order
I advocated against immediately clearing the console when starting --watch in #17756 because it was confusing to have the console suddenly become blank, wait a while, and _then_ give output. After using the feature for a little while, I think it's a little disorienting how the console will only start clearing after the first recompile. This change clears the console and immediately prints a new "Starting compilation in watch mode..." message.
Timestamps look like Gulp's, with grey times inside white brackets.
Files have cyan filenames, yellow line and column numbers, and grey TS{####} errors. I wonder if those are actually useful for folks using the --pretty CLI: are they used for anything outside Visual Studio... Can we just get rid of them?
Re-uses compiler/program's color logic in compiler/watch. The relevant variables are now exported and marked `@internal`. Is there a preferred way of re-using this code in both those files?
* 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
* Still instantiate the extends clause even when theres a noimplicitany error in js
* Only be permissive for JS
* In JS, instantiate classes even when they have too many type arguments, instead of returning unknownType
* Fix#19959 and #19958: Remove un-localizable messages
* Update message
* Reorder error messages
* Fix https://github.com/Microsoft/TypeScript/issues/15399: remove periods at the end of messages
* Accept baselines for error code changes
* accept baselines for removed periods
* Update diagnostic messages
Andy
Josh Goldberg
Diogo Franco (Kovensky)
Arthur Ozga
Sheetal Nandi
Nathan Shively-Sanders
csigs
csigs
Ryan Cavanaugh
Mohamed Hegazy
Josh Goldberg
benbraou
Wesley Wigham
Anders Hejlsberg