* 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
* getEditsForFileRename: Do fresh module resolution instead of relying on cache
* Add host.resolveModuleNameWithFailedLookupLocations method
* Make host.resolveModuleNameWithFailedLookupLocations mandatory, and implement for Project
* Add test, and no need to check host.fileExists
* Change method name and always use cache
* Update name in string
This has 3 changes:
1. In updateGraph when enqueue the typing installation request (depending on unresolved imports)
2. When ActionSet event is received, invalidate only files with unresolved imports and resolve those.
3. When ActionInvalidate event is received, typing installer has detected some change in global typing cache location, so just enqueue a new typing installation request. This will repeat the cycle of setting correct typings and pickiing unresolved imports
There are times when the directory watcher for failed lookup locations isnt invoked and is not very determinitstic
So as a fallback, when we receive typeRoots watch event, handle failed lookup locations as well
This helps in not having to deal with duplicate locations and checking if there exists watch
Anyways the watches are refCount based so we would just addref and remove ref on the same watches
