Unify representation of tuples and other generic types #10466
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Will this be developed into #5453 ? Synthesized generic types and tuple types looks much like variadic kinds. |
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I quite like the changes in the error baselines. Feels neater. |
| @@ -2214,6 +2211,11 @@ namespace ts { | |||
| writePunctuation(writer, SyntaxKind.OpenBracketToken); | |||
| writePunctuation(writer, SyntaxKind.CloseBracketToken); | |||
| } | |||
| else if (type.target.flags & TypeFlags.Tuple) { | |||
| writePunctuation(writer, SyntaxKind.OpenBracketToken); | |||
| writeTypeList(type.typeArguments.slice(0, getTypeReferenceArity(type)), SyntaxKind.CommaToken); | |||
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Why copy this list? Or are there extra type arguments that slice omits? #Resolved
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When a generic type has a this parameter other than itself it is represented as an extra type parameter.
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With this PR we unify the internal representation of tuple types and other generic types. Tuple types are now represented as regular type references to synthesized generic types of the form:
With these changes it is no longer necessary to special case tuple types throughout the type checker. All of the optimizations we have in place for regular generic type references now also apply to tuple types.
Fixes #10431. The compile time for the example drops from 1.2s to 0.08s with
--lib es5and from 30.5s to 0.11s with--lib es6.