* wip-try get symbol of bindingelement in objectBindingPattern first
* Add fourslash tests
* Update .types baselines
* Update .symbols baselines
* Revert checker changes
* Actually lookup type for binding property name definition
* More succinct check, clarify yui's comment
* Add 'name' property to Identifier
* Rename to unescapedText
* Rename 'id.text' to 'id.escapedText'
* Rename 'id.unescapedText' to 'id.text'
* Make escapeIdentifier and unescapeIdentifier do nothing
* 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* Remove outdated comments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
JS-style assignment declarations have a name, but it's not stored on the
name property of the BinaryExpression. This commit adds
`getNameOfDeclaration` to uniformly get the name of a declaration.
It also reworks the declaration of `Declaration` so that accessing
`name` is an error unless the type does *not* include
BinaryExpression.
Address comment: fix spelling mistakes
Address comment: calling `checkApplicableSignatureForJsxOpeningLikeElement` from inside `checkApplicableSignature`
Address comment: fix spelling, rename function to be more consistent
Address comment: minor fix indentation, fix function name isObjectLiteralPropertyDeclaration => isObjectLiteralElement
Address PR: gotoDefinition return the last signature when there is an error in statelss function component
Address PR: convert Foreach to for...of
Address comment: fix type, inline code, clarify name of variables
