Check for undefined source.symbol

Fixes #37014
microsoft · Feb 25, 2020 · d8ce7d7 · d8ce7d7
1 parent 26184f0
commit d8ce7d7
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diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -16239,6 +16239,7 @@ namespace ts {
                 if (unmatchedProperty.valueDeclaration
                     && isNamedDeclaration(unmatchedProperty.valueDeclaration)
                     && isPrivateIdentifier(unmatchedProperty.valueDeclaration.name)
+                    && source.symbol
                     && source.symbol.flags & SymbolFlags.Class) {
                     const privateIdentifierDescription = unmatchedProperty.valueDeclaration.name.escapedText;
                     const symbolTableKey = getSymbolNameForPrivateIdentifier(source.symbol, privateIdentifierDescription);

diff --git a/tests/cases/compiler/privateFieldAssignabilityFromUnknown.ts b/tests/cases/compiler/privateFieldAssignabilityFromUnknown.ts
@@ -0,0 +1,5 @@
+export class Class {
+  #field: any
+}
+
+const task: Class = {} as unknown;