fix: don't allow files to be nested inside other files

package.json

@@ -133,7 +133,7 @@
  "@semantic-release/changelog": "^6.0.1",
  "@semantic-release/git": "^10.0.1",
  "@semantic-release/npm": "^9.0.1",
- "@types/jest": "^29.0.0",
+ "@types/jest": "^29.5.12",
  "@types/mime": "^3.0.0",
  "@types/node": "^10.17.60",
  "app-root-path": "^3.1.0",

src/volume.ts

@@ -911,8 +911,17 @@ export class Volume implements FsCallbackApi, FsSynchronousApi {
  readFileSync(file: TFileId, options?: opts.IReadFileOptions | string): TDataOut {
  const opts = getReadFileOptions(options);
  const flagsNum = flagsToNumber(opts.flag);
- return this.readFileBase(file, flagsNum, opts.encoding as BufferEncoding);
+
+ // Check if the path is a directory, and throw EISDIR error if so
+ if (typeof file === 'string') {
+ if (this.existsSync(file) && this.statSync(file).isDirectory()) {
+ throw createError('EISDIR', 'readFile', file);
+ }
+ }
+
+ return this.readFileBase(file, flagsNum, opts.encoding as BufferEncoding);
  }
+
 
  readFile(id: TFileId, callback: TCallback<TDataOut>);
  readFile(id: TFileId, options: opts.IReadFileOptions | string, callback: TCallback<TDataOut>);
@@ -1064,8 +1073,15 @@ export class Volume implements FsCallbackApi, FsSynchronousApi {
  const flagsNum = flagsToNumber(opts.flag);
  const modeNum = modeToNumber(opts.mode);
  const buf = dataToBuffer(data, opts.encoding);
+
+ // Check if the parent path is a file, and throw ENOTDIR error if so
+ const parentPath = pathModule.dirname(id as string);
+ if (this.existsSync(parentPath) && !this.statSync(parentPath).isDirectory()) {
+ throw createError('ENOTDIR', 'writeFile', id as string);
+ }
+
  this.writeFileBase(id, buf, flagsNum, modeNum);
- }
+}
 
  writeFile(id: TFileId, data: TData, callback: TCallback<void>);
  writeFile(id: TFileId, data: TData, options: opts.IWriteFileOptions | string, callback: TCallback<void>);

tsconfig.json

@@ -11,10 +11,11 @@
  "declaration": true,
  "skipLibCheck": true,
  "noEmitHelpers": true,
- "importHelpers": true
+ "importHelpers": true,
+ "types": ["node", "jest"] 
  },
- "include": ["src"],
- "exclude": ["src/__tests__", "node_modules", "lib", "es6", "es2020", "esm", "docs", "README.md"],
+ "include": ["src", "src/__tests__"],
+ "exclude": ["node_modules", "lib", "es6", "es2020", "esm", "docs", "README.md"],
  "typedocOptions": {
  "entryPoints": [
  "src/index.ts",