* 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
* Refactor node factory API, use node factory in parser
* Move UnparsedSource nodes to factory
* Make most Node properties read-only
* Make pos/end/parent and JSDoc 'comment' read-only
* Update function/constructor-type factories
* Remove treeStateObserver
* Simplify Debug.deprecate
* Remove unused factory methods, simplify lazy factory methods
* Fix base factory used for source file updates
* Update test baseline due to merge from master
* Rename factory methods to be more consistent (#39058)
* Add test case to verify directory casing preservation when watching
* Fix unicode file name handling when watching failed lookup locations
* Add special file name lower conversion routine and use that instead of toLowerCase
Fixes#31819 and #35559
* Remove unicode from code
* Replace toLocaleLowerCase on filenames with ts.toFileNameLowerCase
* Make the intent of using toFileNameLowerCase more clear and why we make the restriction on turkish I with dot on top of it
* Update baselines for newly added tests in master
* Create different watch options in compiler options
* Thread through the new watch options
* Actually use the options passed through for watch strategy
* Support delay on updating child directory watches
* Make watchOptions separate from compilerOptions
* Support passing watch options from command line
* Handle displaying of watchOptions
* Check to make sure default npm exists at path before trying to use it
**Bug**
If the typings installer is run under a copy of node that does not include npm—but on a machine that does have npm installed—it will incorrectly try to use the npm that does not exist next to its running version of node
**Fix**
Make sure that we check that npm we select exists before trying to use it as the default. Otherwise, fall back to using plain old `npm`
* Add command line flag to gate new behavior
* Fix missing semicolon
* Rename JS concepts
1. Assignment declaration -- an assignment that is treated like a
declaration. Previously called [JS] special (assignment|declaration),
among other things.
2. Expando -- a value that can be used as a target in assignment
declarations. Currently, a class, function or empty object literal.
Functions are allowed in Typescript, too. Previously called a JS
container, JS initializer or expando object.
3. JavaScript -> Javascript. This is annoying to type, and looks like
'Java Script' in a camelCase world.
Everything is a pure rename as far as I know. The only test change is
the API baselines, which reflect the rename from SymbolFlags.JSContainer
to SymbolFlags.Assignment.
* Remove TODO
* Rename Javascript->JS
Note that this introduces a variable name collision in a couple of
places, which I resolved like this:
```ts
const isInJavascript = isInJSFile(node);
```
* Optimize sourcemap application more
* Remove test-only memory hog sourceMapDecodedMappings field
* Update for style, remove unused function that triggers warnings in node 10
* Avoid all raw buffer constructor calls
* Small TDZ fix
