* Completion for default export should be '.default'
* Don't include empty string in name table
* getSymbolsInScope() should return local symbols, not exported symbols
* Fix bug: getSymbolAtLocation should work for local symbol too
* Created a branded type for escaped strings
Then flowed it throughout the compiler, finding and fixing a handful of
bugs relating to underscore-prefixed identifiers in the process.
Includes a test for two cases noticed - diagnostics from conflicting
symbols from export *'s, and enum with underscore prefixed member emit.
* Correctly double underscores WRT mapped types
* Add fourslash tests for other fixed issues
* use function call over cast
* Update forEachEntry type accuracy
* Just use escaped names for ActiveLabel
* Remove casts from getPropertyNameForPropertyNameNode
* This pattern has occurred a few times, could use a helper function.
* Remove duplicated helper
* Remove unneeded check, use helper
* Identifiers list is no longer escaped strings
* Extract repeated string-getting code into helper
* Rename type and associated functions
* Make getName() return UnderscoreEscapedString, add getUnescapedName()
* Add list of internal symbol names to escaped string type to cut back on casting
* Remove outdated comments
* Reassign interned values to nodes, just in case
* Swap to string enum
* Add deprecated aliases to escapeIdentifier and unescapeIdentifier
* Add temp var
* Remove unsafe casts
* Rename escaped string type as per @sandersn's suggestion, fix string enum usages
* Reorganize double underscore tests
* Remove jfreeman from TODO
* Remove unneeded parenthesis
* Provide better services for incomplete generic calls
* Use clearer name
* Remove `inferredAnyDefaultTypeArgument` and `getBestGuessSignature`; have `resolveSignature` always get the best signature if !produceDiagnostics
* Update names and comments
The test to make sure that type parameters are in scope for
instantiation previously ignored type parameters created by `@template`.
Now it correctly says that they are in scope.
* Allow export default interface. Related to issue 3792.
* Update exportDefaultAbstractClass test
* Allow default export to be a non-value for lookup purposes
* Add local usage to exportDefaultInterface test
