Function containsNarrowableReference

test/fixtures/snapshot/typescript.js:45368–45370

(expr)

                || ts.isAssignmentExpression(expr) && isNarrowableReference(expr.left);
        }
        function containsNarrowableReference(expr) {
            return isNarrowableReference(expr) || ts.isOptionalChain(expr) && containsNarrowableReference(expr.expression);
        }
        function hasNarrowableArgument(expr) {
            if (expr.arguments) {
                for (var _i = 0, _a = expr.arguments; _i < _a.length; _i++) {