Function appendObjectRestAssignmentsIfNeeded

test/fixtures/snapshot/typescript.js:97194–97266

(statements, node)

            return body;
        }
        function appendObjectRestAssignmentsIfNeeded(statements, node) {
            var containsPrecedingObjectRestOrSpread = false;
            for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                var parameter = _a[_i];
                if (containsPrecedingObjectRestOrSpread) {
                    if (ts.isBindingPattern(parameter.name)) {
                        // In cases where a binding pattern is simply '[]' or '{}',
                        // we usually don't want to emit a var declaration; however, in the presence
                        // of an initializer, we must emit that expression to preserve side effects.
                        //
                        // NOTE: see `insertDefaultValueAssignmentForBindingPattern` in es2015.ts
                        if (parameter.name.elements.length > 0) {
                            var declarations = ts.flattenDestructuringBinding(parameter, visitor, context, 0 /* FlattenLevel.All */, factory.getGeneratedNameForNode(parameter));
                            if (ts.some(declarations)) {
                                var declarationList = factory.createVariableDeclarationList(declarations);
                                var statement = factory.createVariableStatement(/*modifiers*/ undefined, declarationList);
                                ts.setEmitFlags(statement, 1048576 /* EmitFlags.CustomPrologue */);
                                statements = ts.append(statements, statement);
                            }
                        }
                        else if (parameter.initializer) {
                            var name = factory.getGeneratedNameForNode(parameter);
                            var initializer = ts.visitNode(parameter.initializer, visitor, ts.isExpression);
                            var assignment = factory.createAssignment(name, initializer);
                            var statement = factory.createExpressionStatement(assignment);
                            ts.setEmitFlags(statement, 1048576 /* EmitFlags.CustomPrologue */);
                            statements = ts.append(statements, statement);
                        }
                    }
                    else if (parameter.initializer) {
                        // Converts a parameter initializer into a function body statement, i.e.:
                        //
                        //  function f(x = 1) { }
                        //
                        // becomes
                        //
                        //  function f(x) {
                        //    if (typeof x === "undefined") { x = 1; }
                        //  }
                        var name = factory.cloneNode(parameter.name);
                        ts.setTextRange(name, parameter.name);
                        ts.setEmitFlags(name, 48 /* EmitFlags.NoSourceMap */);
                        var initializer = ts.visitNode(parameter.initializer, visitor, ts.isExpression);
                        ts.addEmitFlags(initializer, 48 /* EmitFlags.NoSourceMap */ | 1536 /* EmitFlags.NoComments */);
                        var assignment = factory.createAssignment(name, initializer);
                        ts.setTextRange(assignment, parameter);
                        ts.setEmitFlags(assignment, 1536 /* EmitFlags.NoComments */);
                        var block = factory.createBlock([factory.createExpressionStatement(assignment)]);
                        ts.setTextRange(block, parameter);
                        ts.setEmitFlags(block, 1 /* EmitFlags.SingleLine */ | 32 /* EmitFlags.NoTrailingSourceMap */ | 384 /* EmitFlags.NoTokenSourceMaps */ | 1536 /* EmitFlags.NoComments */);
                        var typeCheck = factory.createTypeCheck(factory.cloneNode(parameter.name), "undefined");
                        var statement = factory.createIfStatement(typeCheck, block);
                        ts.startOnNewLine(statement);
                        ts.setTextRange(statement, parameter);
                        ts.setEmitFlags(statement, 384 /* EmitFlags.NoTokenSourceMaps */ | 32 /* EmitFlags.NoTrailingSourceMap */ | 1048576 /* EmitFlags.CustomPrologue */ | 1536 /* EmitFlags.NoComments */);
                        statements = ts.append(statements, statement);
                    }
                }