Function extractFunctionInScope

test/fixtures/snapshot/typescript.js:160690–160920

* Result of 'extractRange' operation for a specific scope. * Stores either a list of changes that should be applied to extract a range or a list of errors

(node, scope, _a, exposedVariableDeclarations, range, context)

             * Stores either a list of changes that should be applied to extract a range or a list of errors
             */
            function extractFunctionInScope(node, scope, _a, exposedVariableDeclarations, range, context) {
                var usagesInScope = _a.usages, typeParameterUsages = _a.typeParameterUsages, substitutions = _a.substitutions;
                var checker = context.program.getTypeChecker();
                var scriptTarget = ts.getEmitScriptTarget(context.program.getCompilerOptions());
                var importAdder = ts.codefix.createImportAdder(context.file, context.program, context.preferences, context.host);
                // Make a unique name for the extracted function
                var file = scope.getSourceFile();
                var functionNameText = ts.getUniqueName(ts.isClassLike(scope) ? "newMethod" : "newFunction", file);
                var isJS = ts.isInJSFile(scope);
                var functionName = ts.factory.createIdentifier(functionNameText);
                var returnType;
                var parameters = [];
                var callArguments = [];
                var writes;
                usagesInScope.forEach(function (usage, name) {
                    var typeNode;
                    if (!isJS) {
                        var type = checker.getTypeOfSymbolAtLocation(usage.symbol, usage.node);
                        // Widen the type so we don't emit nonsense annotations like "function fn(x: 3) {"
                        type = checker.getBaseTypeOfLiteralType(type);
                        typeNode = ts.codefix.typeToAutoImportableTypeNode(checker, importAdder, type, scope, scriptTarget, 1 /* NodeBuilderFlags.NoTruncation */);
                    }
                    var paramDecl = ts.factory.createParameterDeclaration(
                    /*decorators*/ undefined, 
                    /*modifiers*/ undefined, 
                    /*dotDotDotToken*/ undefined, 
                    /*name*/ name, 
                    /*questionToken*/ undefined, typeNode);
                    parameters.push(paramDecl);
                    if (usage.usage === 2 /* Usage.Write */) {
                        (writes || (writes = [])).push(usage);
                    }
                    callArguments.push(ts.factory.createIdentifier(name));
                });
                var typeParametersAndDeclarations = ts.arrayFrom(typeParameterUsages.values()).map(function (type) { return ({ type: type, declaration: getFirstDeclaration(type) }); });
                var sortedTypeParametersAndDeclarations = typeParametersAndDeclarations.sort(compareTypesByDeclarationOrder);
                var typeParameters = sortedTypeParametersAndDeclarations.length === 0
                    ? undefined
                    : sortedTypeParametersAndDeclarations.map(function (t) { return t.declaration; });
                // Strictly speaking, we should check whether each name actually binds to the appropriate type
                // parameter.  In cases of shadowing, they may not.
                var callTypeArguments = typeParameters !== undefined
                    ? typeParameters.map(function (decl) { return ts.factory.createTypeReferenceNode(decl.name, /*typeArguments*/ undefined); })
                    : undefined;
                // Provide explicit return types for contextually-typed functions
                // to avoid problems when there are literal types present
                if (ts.isExpression(node) && !isJS) {
                    var contextualType = checker.getContextualType(node);
                    returnType = checker.typeToTypeNode(contextualType, scope, 1 /* NodeBuilderFlags.NoTruncation */); // TODO: GH#18217
                }
                var _b = transformFunctionBody(node, exposedVariableDeclarations, writes, substitutions, !!(range.facts & RangeFacts.HasReturn)), body = _b.body, returnValueProperty = _b.returnValueProperty;
                ts.suppressLeadingAndTrailingTrivia(body);
                var newFunction;
                var callThis = !!(range.facts & RangeFacts.UsesThisInFunction);
                if (ts.isClassLike(scope)) {
                    // always create private method in TypeScript files
                    var modifiers = isJS ? [] : [ts.factory.createModifier(121 /* SyntaxKind.PrivateKeyword */)];
                    if (range.facts & RangeFacts.InStaticRegion) {