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Add undefined to default-valued parameters

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When --strictNullChecks is on
This commit is contained in:
Nathan Shively-Sanders
2016-11-03 15:35:10 -07:00
parent 702efd559b
commit 995732fad2
1 changed files with 2 additions and 1 deletions
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3
src/compiler/checker.ts
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@@ -3206,7 +3206,8 @@ namespace ts {
// Use the type of the initializer expression if one is present
if (declaration.initializer) {
const type = checkDeclarationInitializer(declaration);
return addOptionality(type, /*optional*/ declaration.questionToken && includeOptionality);
const isOptional = declaration.questionToken || (declaration.initializer && declaration.kind === SyntaxKind.Parameter);
return addOptionality(type, isOptional && includeOptionality);
}
// If it is a short-hand property assignment, use the type of the identifier