* Add full implemention of Map and Set to shims
* Update default Map interface
* Remove WeakMap/WeakSet
* Add tests for set shim
* Update most usages of Map<K, true> to Set
* PR Feedback
* Fix lint issues
* Change key in fsWatchCallback
* Simpler shim, more tests
* Fix typo in collection shim
* Add test case when the errors are not refreshed if global file is deleted
Testcase for #36728
* When the global file is deleted mark all files as changed
Fixes#36728
* Update other baselines to fix file info
* Add test that calling getAffectedFiles on two different files (even if the second one is saved) returns all files
* If emitting declaration file, update the d.ts signature in state to not have to save all files when different file changes without changing its shape
Fixes#30508
* Add test that fails because file is written multiple times
Reported from #33061
* Handle seenEmittedFiles which was not being set when emit of a file was complete.
It was issue only when errors are reported before emitting (which puts the files into pendingEmit that needs to check only in seenEmittedFiles)
If emit happens before semantic diagnostics query this issue is not repro, because the affected files come into play and those are being set correctly
Fixes#31398
* make baselining source map optional
* Handle emitDeclarationOnly in --build scenario
* Ensure we are using d.ts emit as signature even when --declarationMap is on (map files are emitted before d.ts)
* Move module specifiers to verifyTsBuildOutput
* implement create Hash to be default hashing plus data so we can verify it easily in baseline
* Remove failing baseline
* Accept correct baseline name
* Improve typing for Generators and Async Generators
* Add TReturn and TNext to Iterator, IterableIterator, etc.
* Update ts internal Iterator to be assignable from global Iterator
* Make 'done' optional in IteratorYieldResult
* Revert Iterable and IterableIterator to simpler versions plus other fixes
* Add additional inference tests
* Added additional tests
* PR cleanup and minor async iteration type fix
* Updated diagnostics message and added non-strict tests
* Fix expected arity of Iterator/AsyncIterator
* Enable '--strictNullChecks'
* Fix API baselines
* Make sys.getEnvironmentVariable non-nullable
* make properties optional instead of using `| undefined` in thier type
* reportDiagnostics should be required
* Declare firstAccessor as non-nullable
* Make `some` a type guard
* Fix `getEnvironmentVariable` definition in tests
* Pretend transformFlags are always defined
* Fix one more use of sys.getEnvironmentVariable
* `requiredResponse` accepts undefined, remove assertions
* Mark optional properties as optional instead of using `| undefined`
* Mark optional properties as optional instead of using ` | undefined`
* Remove unnecessary null assertions
* Put the bang on the declaration instead of every use
* Make `createMapFromTemplate` require a parameter
* Mark `EmitResult.emittedFiles` and `EmitResult.sourceMaps` as optional
* Plumb through undefined in emitLsit and EmitExpressionList
* `ElementAccessExpression.argumentExpression` can not be `undefined`
* Add overloads for `writeTokenText`
* Make `shouldWriteSeparatingLineTerminator` argument non-nullable
* Make `synthesizedNodeStartsOnNewLine` argument required
* `PropertyAssignment.initializer` cannot be undefined
* Use one `!` at declaration site instead of on every use site
* Capture host in a constant and avoid null assertions
* Remove few more unused assertions
* Update baselines
* Use parameter defaults
* Update baselines
* Fix lint
* Make Symbol#valueDeclaration and Symbol#declarations non-optional to reduce assertions
* Make Node#symbol and Type#symbol non-optional to reduce assertions
* Make `flags` non-nullable to reduce assertions
* Convert some asserts to type guards
* Make `isNonLocalAlias` a type guard
* Add overload for `getSymbolOfNode` for `Declaration`
* Some more `getSymbolOfNode` changes
* Push undefined suppression into `typeToTypeNodeHelper`
* `NodeBuilderContext.tracker` is never `undefined`
* use `Debug.assertDefined`
* Remove unnecessary tag
* Mark `LiteralType.freshType` and `LiteralTupe.regularType` as required
