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Node param type null needs to fallback to function param type #111

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Merged
nicosammito merged 1 commit into from
Jun 19, 2026
+8 −1
Merged

Node param type null needs to fallback to function param type #111

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9 changes: 8 additions & 1 deletion src/schema/getSignatureSchema.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,13 @@ export const getSignatureSchema = (
// Extract parameter types from the function definition
const funktionParameterTypes = extractFunctionParameterTypes(checker, funktion, node)

// Fall back to function param type when node param resolved to undefined (e.g. value: null passed as generic type param)
const mergedParameterTypes = nodeParameterTypes?.map((type, index) =>
(type.flags & ts.TypeFlags.Undefined) !== 0
? (funktionParameterTypes?.[index] ?? type)
: type
)

// Identify parameter dependencies based on type parameters
const funktionDependencies = getParameterDependencies(funktion!)

Expand All @@ -93,7 +100,7 @@ export const getSignatureSchema = (
nodeId,
checker,
node!,
nodeParameterTypes,
mergedParameterTypes,
funktionParameterTypes,
funktionDependencies,
nodeId ? declaredFunctionsMap : new Map(),
Expand Down