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* 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 b3178d46184c068b7b83008ad98a52faac1e8a34. * 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>