Function checkNonNullChain

test/fixtures/snapshot/typescript.js:77341–77345

(node)

            return targetType;
        }
        function checkNonNullChain(node) {
            var leftType = checkExpression(node.expression);
            var nonOptionalType = getOptionalExpressionType(leftType, node.expression);
            return propagateOptionalTypeMarker(getNonNullableType(nonOptionalType), node, nonOptionalType !== leftType);
        }
        function checkNonNullAssertion(node) {
            return node.flags & 32 /* NodeFlags.OptionalChain */ ? checkNonNullChain(node) :
                getNonNullableType(checkExpression(node.expression));