* Fix#17023
* Be more general when handling matching references through binding elements
* Better cache key, PR feedback
* Deeper tests, better cache key handling
For ?, provide two code fixes, one for jsdoc/closure semantics
(`?t -> t | null)` and one for flow semantics
(`?t -> t | null | undefined`).
The current way of doing this is the hackiest thing you can imagine, but
it was easier than lifting everything into the list monad for a code fix
that I might not actually keep.
1. Remove checkJSDocFunctionType in favour of checkSignature.
2. Check that 'new', in addition to 'this', must be the first parameter.
3. Remove prematurely added JSDoc-quickfix test.
* 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* Remove outdated comments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
The code fix for spelling correction needs to provide suggestions based
on the apparent type since sometimes the type at a location will be a type
parameter. One such example is `this`.
Fixes#16744
