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microsoft / TypeScript Public

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Support contextual type discrimination based on template literal expressions#62203

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Andarist wants to merge 6 commits intomicrosoft:mainmicrosoft/TypeScript:mainfrom

Andarist:fix/template-literal-types-as-discriminantsAndarist/TypeScript:fix/template-literal-types-as-discriminantsCopy head branch name to clipboard

Conversation Commits6 (6)Checks Files changed

Open

Support contextual type discrimination based on template literal expressions#62203
Andarist wants to merge 6 commits intomicrosoft:mainfrom
Andarist:fix/template-literal-types-as-discriminants

Commits

Commits on Aug 4, 2025

Don't widen template literal types when considering them to be possible discriminants
Andarist
committed

Commits on Aug 5, 2025

add error tests
Andarist
committed
rename the new type
Andarist
committed
only produce context free template literal types when all types pass `isPatternLiteralPlaceholderType`
Andarist
committed
add extra test case
Andarist
committed
fixup
Andarist
committed

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