* Switch index signature storage to 'indexInfos: IndexInfo[]' property
* Accept new baselines
* Remove another usage of IndexKind enum
* Update getIndexedAccessType and resolveMappedTypeMembers
* Accept new baselines
* Update grammar checking for index signatures
* Accept new baselines
* Consider all index signatures in mapped types and union types
* Accept new baselines
* Update getIndexType
* Accept new baselines
* Intersect multiple applicable index signatures
* Use getApplicableIndexInfo instead of hardwired string/number handling
* Update index signature relationship checking
* Report type for which index signature is missing
* Report type for which index signature is missing
* Accept new baselines
* Make 'number' index signatures consistently apply to numeric strings
* Accept new baselines
* Update fourslash test
* Revise index constraint checking
* Accept new baselines
* Update error messages
* Accept new baselines
* Update type inference from index signatures
* Update isKnownProperty
* Update contextual typing based on index signatures
* Accept new baselines
* Support union types in index signature declarations
* Accept new baselines
* Check duplicate index signatures / remove redundant template literals from unions with string
* Accept new baselines
* Include key type in diagnostic / check symbol-named properties
* Accept new baselines
* Minor fix
* Add tests
* Accept new baselines
* Add optimized findApplicableIndexInfoForName
* Accept new baselines
* Another place we don't need to obtain literal type for property name
* Accept new baselines
* Don't create literal types that are going to be discarded
* Individual maps for string, number, bigint, and enum literal types
* Remove ineffective optimizations
* Accept new baselines
* Permit intersections as key types in index signatures
* Index expression in element access is template literal context
* Add tests
* Accept new baselines
* Symbol index signatures from object literals with computed symbol properties
* Accept new baselines
* Add more tests
* Accept new baselines
* Implement Go To Definition for all applicable index signatures
* Add fourslash test
* Accept new API baselines
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