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Fix assigned type of assignment nested in literals

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Fixes #12946
This commit is contained in:
Nathan Shively-Sanders
2017-02-08 13:28:23 -08:00
parent a7728f8fa1
commit 125dd57a75
5 changed files with 88 additions and 1 deletions
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10
src/compiler/checker.ts
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@@ -9469,11 +9469,19 @@ namespace ts {
}
function getAssignedTypeOfBinaryExpression(node: BinaryExpression): Type {
return node.parent.kind === SyntaxKind.ArrayLiteralExpression || node.parent.kind === SyntaxKind.PropertyAssignment ?
const isDestructuringDefaultAssignment =
node.parent.kind === SyntaxKind.ArrayLiteralExpression && isDestructuringAssignmentTarget(node.parent) ||
node.parent.kind === SyntaxKind.PropertyAssignment && isDestructuringAssignmentTarget(node.parent.parent);
return isDestructuringDefaultAssignment ?
getTypeWithDefault(getAssignedType(node), node.right) :
getTypeOfExpression(node.right);
}
function isDestructuringAssignmentTarget(parent: Node) {
return parent.parent.kind === SyntaxKind.BinaryExpression && (parent.parent as BinaryExpression).left === parent ||
parent.parent.kind === SyntaxKind.ForOfStatement && (parent.parent as ForOfStatement).initializer === parent;
}
function getAssignedTypeOfArrayLiteralElement(node: ArrayLiteralExpression, element: Expression): Type {
return getTypeOfDestructuredArrayElement(getAssignedType(node), indexOf(node.elements, element));
}