Function addRestParameterIfNeeded

test/fixtures/snapshot/typescript.js:99455–99498

* Adds statements to the body of a function-like node if it contains a rest parameter. * * @param statements The statements for the new function body. * @param node A function-like node. * @param inConstructorWithSynthesizedSuper A value indicating whether the par

(statements, node, inConstructorWithSynthesizedSuper)

         *                                          synthesized call to `super`
         */
        function addRestParameterIfNeeded(statements, node, inConstructorWithSynthesizedSuper) {
            var prologueStatements = [];
            var parameter = ts.lastOrUndefined(node.parameters);
            if (!shouldAddRestParameter(parameter, inConstructorWithSynthesizedSuper)) {
                return false;
            }
            // `declarationName` is the name of the local declaration for the parameter.
            // TODO(rbuckton): Does this need to be parented?
            var declarationName = parameter.name.kind === 79 /* SyntaxKind.Identifier */ ? ts.setParent(ts.setTextRange(factory.cloneNode(parameter.name), parameter.name), parameter.name.parent) : factory.createTempVariable(/*recordTempVariable*/ undefined);
            ts.setEmitFlags(declarationName, 48 /* EmitFlags.NoSourceMap */);
            // `expressionName` is the name of the parameter used in expressions.
            var expressionName = parameter.name.kind === 79 /* SyntaxKind.Identifier */ ? factory.cloneNode(parameter.name) : declarationName;
            var restIndex = node.parameters.length - 1;
            var temp = factory.createLoopVariable();
            // var param = [];
            prologueStatements.push(ts.setEmitFlags(ts.setTextRange(factory.createVariableStatement(
            /*modifiers*/ undefined, factory.createVariableDeclarationList([
                factory.createVariableDeclaration(declarationName, 
                /*exclamationToken*/ undefined, 
                /*type*/ undefined, factory.createArrayLiteralExpression([]))
            ])), 
            /*location*/ parameter), 1048576 /* EmitFlags.CustomPrologue */));
            // for (var _i = restIndex; _i < arguments.length; _i++) {
            //   param[_i - restIndex] = arguments[_i];
            // }
            var forStatement = factory.createForStatement(ts.setTextRange(factory.createVariableDeclarationList([
                factory.createVariableDeclaration(temp, /*exclamationToken*/ undefined, /*type*/ undefined, factory.createNumericLiteral(restIndex))
            ]), parameter), ts.setTextRange(factory.createLessThan(temp, factory.createPropertyAccessExpression(factory.createIdentifier("arguments"), "length")), parameter), ts.setTextRange(factory.createPostfixIncrement(temp), parameter), factory.createBlock([
                ts.startOnNewLine(ts.setTextRange(factory.createExpressionStatement(factory.createAssignment(factory.createElementAccessExpression(expressionName, restIndex === 0
                    ? temp
                    : factory.createSubtract(temp, factory.createNumericLiteral(restIndex))), factory.createElementAccessExpression(factory.createIdentifier("arguments"), temp))), 
                /*location*/ parameter))
            ]));
            ts.setEmitFlags(forStatement, 1048576 /* EmitFlags.CustomPrologue */);
            ts.startOnNewLine(forStatement);
            prologueStatements.push(forStatement);
            if (parameter.name.kind !== 79 /* SyntaxKind.Identifier */) {
                // do the actual destructuring of the rest parameter if necessary
                prologueStatements.push(ts.setEmitFlags(ts.setTextRange(factory.createVariableStatement(
                /*modifiers*/ undefined, factory.createVariableDeclarationList(ts.flattenDestructuringBinding(parameter, visitor, context, 0 /* FlattenLevel.All */, expressionName))), parameter), 1048576 /* EmitFlags.CustomPrologue */));
            }
            ts.insertStatementsAfterCustomPrologue(statements, prologueStatements);
            return true;
        }
        /**
         * Adds a statement to capture the `this` of a function declaration if it is needed.
         * NOTE: This must be executed *after* the subtree has been visited.