add unique index name

package.json

@@ -64,5 +64,8 @@
     "eslint": "^8.1.0",
     "typescript": "^4.4.4",
     "vsce": "^1.95.1"
+  },
+  "dependencies": {
+    "nanoid": "^3.1.30"
   }
 }

src/foldingProvider.ts

@@ -1,5 +1,5 @@
 import * as vscode from "vscode";
-import treeStringToJson from "./tree";
+import { INDEX_NAME, treeStringToJson } from "./tree";
 
 class FoldingProvider implements vscode.FoldingRangeProvider {
   onDidChangeFoldingRanges?: vscode.Event<void> | undefined;
@@ -10,11 +10,12 @@ class FoldingProvider implements vscode.FoldingRangeProvider {
   ): vscode.ProviderResult<vscode.FoldingRange[]> {
     const getLastNode = (branch: Record<string, any>) => {
       const indexes: Array<number> = [];
+      // Get the last line number that is a child of the given branch
       const getIndexes = (branch: Record<string, any>) => {
         if (Object.values(branch).length === 1) {
-          indexes.push(branch.__index);
+          indexes.push(branch[INDEX_NAME]);
         } else {
-          Object.values(branch).forEach(child => {
+          Object.values(branch).forEach((child) => {
             getIndexes(child);
           });
         }
@@ -26,17 +27,17 @@ class FoldingProvider implements vscode.FoldingRangeProvider {
     const ranges = new Array<vscode.FoldingRange>();
     const getRanges = (branch: Record<string, any>) => {
       const children = Object.values(branch);
-      if (children.length == 1) return; 
-      const startIndex = branch.__index;
+      if (children.length == 1) return;
+      const startIndex = branch[INDEX_NAME];
       const endIndex = getLastNode(branch);
       ranges.push(new vscode.FoldingRange(startIndex, endIndex, vscode.FoldingRangeKind.Region));
       children.forEach((child) => {
         getRanges(child);
       });
     };
-    
+
     const tree = treeStringToJson(document.getText());
-    Object.values(tree).forEach(branch => {
+    Object.values(tree).forEach((branch) => {
       getRanges(branch);
     });
 

src/tree.ts

@@ -1,8 +1,13 @@
+import { nanoid } from "nanoid";
+
+// Use a unique index so that it won't conflict with any file names
+export const INDEX_NAME = nanoid();
+
 const getNumberOfTabs = (line: string) => {
   return (line.match(/\t/g) || []).length;
 };
 
-const treeStringToJson = (tree: string) => {
+export const treeStringToJson = (tree: string) => {
   const elements = new Set();
   let prevLine = "";
   const path: Array<string> = [];
@@ -38,12 +43,9 @@ const treeStringToJson = (tree: string) => {
       (branch: any, filename: string) => branch[filename],
       elements
     );
-
-    current[filename] = { __index: index  };
+    current[filename] = { [INDEX_NAME]: index  };
     prevLine = line;
     path.push(filename);
   });
   return elements;
-};
-
-export default treeStringToJson;
+};