Function extractConstantInScope

test/fixtures/snapshot/typescript.js:160925–161076

* 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, rangeFacts, context)

             * Stores either a list of changes that should be applied to extract a range or a list of errors
             */
            function extractConstantInScope(node, scope, _a, rangeFacts, context) {
                var _b;
                var substitutions = _a.substitutions;
                var checker = context.program.getTypeChecker();
                // Make a unique name for the extracted variable
                var file = scope.getSourceFile();
                var localNameText = ts.isPropertyAccessExpression(node) && !ts.isClassLike(scope) && !checker.resolveName(node.name.text, node, 111551 /* SymbolFlags.Value */, /*excludeGlobals*/ false) && !ts.isPrivateIdentifier(node.name) && !ts.isKeyword(node.name.originalKeywordKind)
                    ? node.name.text
                    : ts.getUniqueName(ts.isClassLike(scope) ? "newProperty" : "newLocal", file);
                var isJS = ts.isInJSFile(scope);
                var variableType = isJS || !checker.isContextSensitive(node)
                    ? undefined
                    : checker.typeToTypeNode(checker.getContextualType(node), scope, 1 /* NodeBuilderFlags.NoTruncation */); // TODO: GH#18217
                var initializer = transformConstantInitializer(ts.skipParentheses(node), substitutions);
                (_b = transformFunctionInitializerAndType(variableType, initializer), variableType = _b.variableType, initializer = _b.initializer);
                ts.suppressLeadingAndTrailingTrivia(initializer);
                var changeTracker = ts.textChanges.ChangeTracker.fromContext(context);
                if (ts.isClassLike(scope)) {
                    ts.Debug.assert(!isJS, "Cannot extract to a JS class"); // See CannotExtractToJSClass
                    var modifiers = [];
                    modifiers.push(ts.factory.createModifier(121 /* SyntaxKind.PrivateKeyword */));
                    if (rangeFacts & RangeFacts.InStaticRegion) {
                        modifiers.push(ts.factory.createModifier(124 /* SyntaxKind.StaticKeyword */));
                    }
                    modifiers.push(ts.factory.createModifier(145 /* SyntaxKind.ReadonlyKeyword */));
                    var newVariable = ts.factory.createPropertyDeclaration(
                    /*decorators*/ undefined, modifiers, localNameText, 
                    /*questionToken*/ undefined, variableType, initializer);
                    var localReference = ts.factory.createPropertyAccessExpression(rangeFacts & RangeFacts.InStaticRegion
                        ? ts.factory.createIdentifier(scope.name.getText()) // TODO: GH#18217
                        : ts.factory.createThis(), ts.factory.createIdentifier(localNameText));
                    if (isInJSXContent(node)) {
                        localReference = ts.factory.createJsxExpression(/*dotDotDotToken*/ undefined, localReference);
                    }
                    // Declare
                    var maxInsertionPos = node.pos;
                    var nodeToInsertBefore = getNodeToInsertPropertyBefore(maxInsertionPos, scope);
                    changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newVariable, /*blankLineBetween*/ true);
                    // Consume
                    changeTracker.replaceNode(context.file, node, localReference);
                }
                else {
                    var newVariableDeclaration = ts.factory.createVariableDeclaration(localNameText, /*exclamationToken*/ undefined, variableType, initializer);
                    // If the node is part of an initializer in a list of variable declarations, insert a new
                    // variable declaration into the list (in case it depends on earlier ones).
                    // CONSIDER: If the declaration list isn't const, we might want to split it into multiple
                    // lists so that the newly extracted one can be const.
                    var oldVariableDeclaration = getContainingVariableDeclarationIfInList(node, scope);
                    if (oldVariableDeclaration) {
                        // Declare
                        // CONSIDER: could detect that each is on a separate line (See `extractConstant_VariableList_MultipleLines` in `extractConstants.ts`)
                        changeTracker.insertNodeBefore(context.file, oldVariableDeclaration, newVariableDeclaration);
                        // Consume
                        var localReference = ts.factory.createIdentifier(localNameText);
                        changeTracker.replaceNode(context.file, node, localReference);
                    }
                    else if (node.parent.kind === 238 /* SyntaxKind.ExpressionStatement */ && scope === ts.findAncestor(node, isScope)) {
                        // If the parent is an expression statement and the target scope is the immediately enclosing one,