Anders Hejlsberg 6f0c91c4cb Template literal types and mapped type 'as' clauses (#40336) ...

* Initial implementation of string template types

* Accept new API baselines

* Accept new baselines

* Unified checking for large cross product union types

* Accept new baselines

* Ensure errors from union type resolution are reported

* Accept new baselines

* Compute constraints for string template types

* Support `as T` clause in mapped types

* Accept new API baselines

* Add missing semicolon

* Add checking of `as T` clauses

* Support casing modifiers in string template types

* Accept new baselines

* Bump keyword maximum length

* fix anders

* Revert "fix anders"

This reverts commit b3178d4618.

* Properly handle 'as T' clause with keyof for mapped type

* Fix lint error

* Single character inferences and anchored end span matching

* Fewer array copy operations in template literal type resolution

* Handle cases where 'as T' maps multiple properties onto one

* Fix lint error

* Store key type instead of type mapper in MappedSymbol

* No constraint on `in T` type when `as N` clause present

* Rename from TemplateType to TemplateLiteralType

* Accept new API baselines

* Add tests

* Accept new baselines

* Address CR feedback

* Accept new API baselines

Co-authored-by: Erich Gamma <egamma@microsoft.com>

2020-09-09 17:23:22 -10:00

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baselines/reference

Template literal types and mapped type 'as' clauses (#40336)

2020-09-09 17:23:22 -10:00

cases

Template literal types and mapped type 'as' clauses (#40336)

2020-09-09 17:23:22 -10:00

lib

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