Merge pull request #16 from modelcontextprotocol/mahesh/add-filesystem

Add Filesystem Server
2026-02-19 11:54:58 -05:00 · 2024-11-21 06:36:07 +01:00
parent e1dda254d7 234819e0b4
commit ea273a37a4
7 changed files with 944 additions and 5 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -297,4 +297,4 @@ cython_debug/
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+#.idea/
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
      "dependencies": {
        "@modelcontextprotocol/server-brave-search": "*",
        "@modelcontextprotocol/server-everything": "*",
+        "@modelcontextprotocol/server-filesystem": "*",
        "@modelcontextprotocol/server-gdrive": "*",
        "@modelcontextprotocol/server-memory": "*",
        "@modelcontextprotocol/server-postgres": "*",
@@ -56,6 +57,102 @@
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+      "license": "ISC",
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+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
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+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
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+      "dependencies": {
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+      "license": "MIT",
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+      "funding": {
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    "node_modules/@modelcontextprotocol/sdk": {
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@@ -74,6 +171,10 @@
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      "link": true
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@@ -697,6 +807,20 @@
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@@ -1745,6 +1912,15 @@
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      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3063,7 +3370,6 @@
    "src/filesystem": {
      "name": "@modelcontextprotocol/server-filesystem",
      "version": "0.1.0",
-      "extraneous": true,
      "license": "MIT",
      "dependencies": {
        "@modelcontextprotocol/sdk": "0.5.0",
@@ -3078,6 +3384,60 @@
        "typescript": "^5.3.3"
      }
    },
+    "src/filesystem/node_modules/@types/node": {
+      "version": "20.17.6",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.17.6.tgz",
+      "integrity": "sha512-VEI7OdvK2wP7XHnsuXbAJnEpEkF6NjSN45QJlL4VGqZSXsnicpesdTWsg9RISeSdYd3yeRj/y3k5KGjUXYnFwQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.19.2"
+      }
+    },
+    "src/filesystem/node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "src/filesystem/node_modules/glob": {
+      "version": "10.4.5",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.4.5.tgz",
+      "integrity": "sha512-7Bv8RF0k6xjo7d4A/PxYLbUCfb6c+Vpd2/mB2yRDlew7Jb5hEXiCD9ibfO7wpk8i4sevK6DFny9h7EYbM3/sHg==",
+      "license": "ISC",
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^3.1.2",
+        "minimatch": "^9.0.4",
+        "minipass": "^7.1.2",
+        "package-json-from-dist": "^1.0.0",
+        "path-scurry": "^1.11.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "src/filesystem/node_modules/minimatch": {
+      "version": "9.0.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
+      "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
    "src/gdrive": {
      "name": "@modelcontextprotocol/server-gdrive",
      "version": "0.1.0",
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
    "@modelcontextprotocol/server-puppeteer": "*",
    "@modelcontextprotocol/server-slack": "*",
    "@modelcontextprotocol/server-brave-search": "*",
-    "@modelcontextprotocol/server-memory": "*"
+    "@modelcontextprotocol/server-memory": "*",
+    "@modelcontextprotocol/server-filesystem": "*"
  }
 }
--- a/src/filesystem/README.md
+++ b/src/filesystem/README.md
@@ -0,0 +1,89 @@
+# Filesystem MCP Server
+
+Node.js server implementing Model Context Protocol (MCP) for filesystem operations.
+
+## Features
+
+- Read/write files
+- Create/list/delete directories
+- Move files/directories
+- Search files
+- Get file metadata
+
+**Note**: The server will only allow operations within directories specified via `args`.
+
+## API
+
+### Resources
+
+- `file://system`: File system operations interface
+
+### Tools
+
+- **read_file**
+  - Read complete contents of a file
+  - Input: `path` (string)
+  - Reads complete file contents with UTF-8 encoding
+
+- **read_multiple_files**
+  - Read multiple files simultaneously
+  - Input: `paths` (string[])
+  - Failed reads won't stop the entire operation
+
+- **write_file**
+  - Create new file or overwrite existing (exercise caution with this)
+  - Inputs:
+    - `path` (string): File location
+    - `content` (string): File content
+
+- **create_directory**
+  - Create new directory or ensure it exists
+  - Input: `path` (string)
+  - Creates parent directories if needed
+  - Succeeds silently if directory exists
+
+- **list_directory**
+  - List directory contents with [FILE] or [DIR] prefixes
+  - Input: `path` (string)
+
+- **move_file**
+  - Move or rename files and directories
+  - Inputs:
+    - `source` (string)
+    - `destination` (string)
+  - Fails if destination exists
+
+- **search_files**
+  - Recursively search for files/directories
+  - Inputs:
+    - `path` (string): Starting directory
+    - `pattern` (string): Search pattern
+  - Case-insensitive matching
+  - Returns full paths to matches
+
+- **get_file_info**
+  - Get detailed file/directory metadata
+  - Input: `path` (string)
+  - Returns:
+    - Size
+    - Creation time
+    - Modified time
+    - Access time
+    - Type (file/directory)
+    - Permissions
+
+- **list_allowed_directories**
+  - List all directories the server is allowed to access
+  - No input required
+  - Returns:
+    - Directories that this server can read/write from
+
+## Usage with Claude Desktop
+Add this to your `claude_desktop_config.json`:
+```json
+{
+  "mcp-server-filesystem": {
+    "command": "mcp-server-filesystem",
+    "args": ["Users/username/Desktop", "Users/username/Desktop", "/path/to/other/allowed/dir"]
+  }
+}
--- a/src/filesystem/index.ts
+++ b/src/filesystem/index.ts
@@ -0,0 +1,447 @@
+#!/usr/bin/env node
+
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import {
+  CallToolRequestSchema,
+  ListToolsRequestSchema,
+  ToolSchema,
+} from "@modelcontextprotocol/sdk/types.js";
+import fs from "fs/promises";
+import path from "path";
+import os from 'os';
+import { z } from "zod";
+import { zodToJsonSchema } from "zod-to-json-schema";
+
+// Command line argument parsing
+const args = process.argv.slice(2);
+if (args.length === 0) {
+  console.error("Usage: mcp-server-filesystem <allowed-directory> [additional-directories...]");
+  process.exit(1);
+}
+
+// Normalize all paths consistently
+function normalizePath(p: string): string {
+  return path.normalize(p).toLowerCase();
+}
+
+function expandHome(filepath: string): string {
+  if (filepath.startsWith('~/') || filepath === '~') {
+    return path.join(os.homedir(), filepath.slice(1));
+  }
+  return filepath;
+}
+
+// Store allowed directories in normalized form
+const allowedDirectories = args.map(dir => 
+  normalizePath(path.resolve(expandHome(dir)))
+);
+
+// Validate that all directories exist and are accessible
+await Promise.all(args.map(async (dir) => {
+  try {
+    const stats = await fs.stat(dir);
+    if (!stats.isDirectory()) {
+      console.error(`Error: ${dir} is not a directory`);
+      process.exit(1);
+    }
+  } catch (error) {
+    console.error(`Error accessing directory ${dir}:`, error);
+    process.exit(1);
+  }
+}));
+
+// Security utilities
+async function validatePath(requestedPath: string): Promise<string> {
+  const expandedPath = expandHome(requestedPath);
+  const absolute = path.isAbsolute(expandedPath)
+    ? path.resolve(expandedPath)
+    : path.resolve(process.cwd(), expandedPath);
+    
+  const normalizedRequested = normalizePath(absolute);
+
+  // Check if path is within allowed directories
+  const isAllowed = allowedDirectories.some(dir => normalizedRequested.startsWith(dir));
+  if (!isAllowed) {
+    throw new Error(`Access denied - path outside allowed directories: ${absolute} not in ${allowedDirectories.join(', ')}`);
+  }
+
+  // Handle symlinks by checking their real path
+  try {
+    const realPath = await fs.realpath(absolute);
+    const normalizedReal = normalizePath(realPath);
+    const isRealPathAllowed = allowedDirectories.some(dir => normalizedReal.startsWith(dir));
+    if (!isRealPathAllowed) {
+      throw new Error("Access denied - symlink target outside allowed directories");
+    }
+    return realPath;
+  } catch (error) {
+    // For new files that don't exist yet, verify parent directory
+    const parentDir = path.dirname(absolute);
+    try {
+      const realParentPath = await fs.realpath(parentDir);
+      const normalizedParent = normalizePath(realParentPath);
+      const isParentAllowed = allowedDirectories.some(dir => normalizedParent.startsWith(dir));
+      if (!isParentAllowed) {
+        throw new Error("Access denied - parent directory outside allowed directories");
+      }
+      return absolute;
+    } catch {
+      throw new Error(`Parent directory does not exist: ${parentDir}`);
+    }
+  }
+}
+
+// Schema definitions
+const ReadFileArgsSchema = z.object({
+  path: z.string(),
+});
+
+const ReadMultipleFilesArgsSchema = z.object({
+  paths: z.array(z.string()),
+});
+
+const WriteFileArgsSchema = z.object({
+  path: z.string(),
+  content: z.string(),
+});
+
+const CreateDirectoryArgsSchema = z.object({
+  path: z.string(),
+});
+
+const ListDirectoryArgsSchema = z.object({
+  path: z.string(),
+});
+
+const MoveFileArgsSchema = z.object({
+  source: z.string(),
+  destination: z.string(),
+});
+
+const SearchFilesArgsSchema = z.object({
+  path: z.string(),
+  pattern: z.string(),
+});
+
+const GetFileInfoArgsSchema = z.object({
+  path: z.string(),
+});
+
+const ToolInputSchema = ToolSchema.shape.inputSchema;
+type ToolInput = z.infer<typeof ToolInputSchema>;
+
+interface FileInfo {
+  size: number;
+  created: Date;
+  modified: Date;
+  accessed: Date;
+  isDirectory: boolean;
+  isFile: boolean;
+  permissions: string;
+}
+
+// Server setup
+const server = new Server(
+  {
+    name: "secure-filesystem-server",
+    version: "0.2.0",
+  },
+  {
+    capabilities: {
+      tools: {},
+    },
+  },
+);
+
+// Tool implementations
+async function getFileStats(filePath: string): Promise<FileInfo> {
+  const stats = await fs.stat(filePath);
+  return {
+    size: stats.size,
+    created: stats.birthtime,
+    modified: stats.mtime,
+    accessed: stats.atime,
+    isDirectory: stats.isDirectory(),
+    isFile: stats.isFile(),
+    permissions: stats.mode.toString(8).slice(-3),
+  };
+}
+
+async function searchFiles(
+  rootPath: string,
+  pattern: string,
+): Promise<string[]> {
+  const results: string[] = [];
+
+  async function search(currentPath: string) {
+    const entries = await fs.readdir(currentPath, { withFileTypes: true });
+
+    for (const entry of entries) {
+      const fullPath = path.join(currentPath, entry.name);
+      
+      try {
+        // Validate each path before processing
+        await validatePath(fullPath);
+
+        if (entry.name.toLowerCase().includes(pattern.toLowerCase())) {
+          results.push(fullPath);
+        }
+
+        if (entry.isDirectory()) {
+          await search(fullPath);
+        }
+      } catch (error) {
+        // Skip invalid paths during search
+        continue;
+      }
+    }
+  }
+
+  await search(rootPath);
+  return results;
+}
+
+// Tool handlers
+server.setRequestHandler(ListToolsRequestSchema, async () => {
+  return {
+    tools: [
+      {
+        name: "read_file",
+        description:
+          "Read the complete contents of a file from the file system. " +
+          "Handles various text encodings and provides detailed error messages " +
+          "if the file cannot be read. Use this tool when you need to examine " +
+          "the contents of a single file. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(ReadFileArgsSchema) as ToolInput,
+      },
+      {
+        name: "read_multiple_files",
+        description:
+          "Read the contents of multiple files simultaneously. This is more " +
+          "efficient than reading files one by one when you need to analyze " +
+          "or compare multiple files. Each file's content is returned with its " +
+          "path as a reference. Failed reads for individual files won't stop " +
+          "the entire operation. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(ReadMultipleFilesArgsSchema) as ToolInput,
+      },
+      {
+        name: "write_file",
+        description:
+          "Create a new file or completely overwrite an existing file with new content. " +
+          "Use with caution as it will overwrite existing files without warning. " +
+          "Handles text content with proper encoding. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(WriteFileArgsSchema) as ToolInput,
+      },
+      {
+        name: "create_directory",
+        description:
+          "Create a new directory or ensure a directory exists. Can create multiple " +
+          "nested directories in one operation. If the directory already exists, " +
+          "this operation will succeed silently. Perfect for setting up directory " +
+          "structures for projects or ensuring required paths exist. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(CreateDirectoryArgsSchema) as ToolInput,
+      },
+      {
+        name: "list_directory",
+        description:
+          "Get a detailed listing of all files and directories in a specified path. " +
+          "Results clearly distinguish between files and directories with [FILE] and [DIR] " +
+          "prefixes. This tool is essential for understanding directory structure and " +
+          "finding specific files within a directory. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(ListDirectoryArgsSchema) as ToolInput,
+      },
+      {
+        name: "move_file",
+        description:
+          "Move or rename files and directories. Can move files between directories " +
+          "and rename them in a single operation. If the destination exists, the " +
+          "operation will fail. Works across different directories and can be used " +
+          "for simple renaming within the same directory. Both source and destination must be within allowed directories.",
+        inputSchema: zodToJsonSchema(MoveFileArgsSchema) as ToolInput,
+      },
+      {
+        name: "search_files",
+        description:
+          "Recursively search for files and directories matching a pattern. " +
+          "Searches through all subdirectories from the starting path. The search " +
+          "is case-insensitive and matches partial names. Returns full paths to all " +
+          "matching items. Great for finding files when you don't know their exact location. " +
+          "Only searches within allowed directories.",
+        inputSchema: zodToJsonSchema(SearchFilesArgsSchema) as ToolInput,
+      },
+      {
+        name: "get_file_info",
+        description:
+          "Retrieve detailed metadata about a file or directory. Returns comprehensive " +
+          "information including size, creation time, last modified time, permissions, " +
+          "and type. This tool is perfect for understanding file characteristics " +
+          "without reading the actual content. Only works within allowed directories.",
+        inputSchema: zodToJsonSchema(GetFileInfoArgsSchema) as ToolInput,
+      },
+      {
+        name: "list_allowed_directories",
+        description: 
+          "Returns the list of directories that this server is allowed to access. " +
+          "Use this to understand which directories are available before trying to access files.",
+        inputSchema: {
+          type: "object",
+          properties: {},
+          required: [],
+        },
+      },
+    ],
+  };
+});
+
+
+server.setRequestHandler(CallToolRequestSchema, async (request) => {
+  try {
+    const { name, arguments: args } = request.params;
+
+    switch (name) {
+      case "read_file": {
+        const parsed = ReadFileArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for read_file: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        const content = await fs.readFile(validPath, "utf-8");
+        return {
+          content: [{ type: "text", text: content }],
+        };
+      }
+
+      case "read_multiple_files": {
+        const parsed = ReadMultipleFilesArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for read_multiple_files: ${parsed.error}`);
+        }
+        const results = await Promise.all(
+          parsed.data.paths.map(async (filePath: string) => {
+            try {
+              const validPath = await validatePath(filePath);
+              const content = await fs.readFile(validPath, "utf-8");
+              return `${filePath}:\n${content}\n`;
+            } catch (error) {
+              const errorMessage = error instanceof Error ? error.message : String(error);
+              return `${filePath}: Error - ${errorMessage}`;
+            }
+          }),
+        );
+        return {
+          content: [{ type: "text", text: results.join("\n---\n") }],
+        };
+      }
+
+      case "write_file": {
+        const parsed = WriteFileArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for write_file: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        await fs.writeFile(validPath, parsed.data.content, "utf-8");
+        return {
+          content: [{ type: "text", text: `Successfully wrote to ${parsed.data.path}` }],
+        };
+      }
+
+      case "create_directory": {
+        const parsed = CreateDirectoryArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for create_directory: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        await fs.mkdir(validPath, { recursive: true });
+        return {
+          content: [{ type: "text", text: `Successfully created directory ${parsed.data.path}` }],
+        };
+      }
+
+      case "list_directory": {
+        const parsed = ListDirectoryArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for list_directory: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        const entries = await fs.readdir(validPath, { withFileTypes: true });
+        const formatted = entries
+          .map((entry) => `${entry.isDirectory() ? "[DIR]" : "[FILE]"} ${entry.name}`)
+          .join("\n");
+        return {
+          content: [{ type: "text", text: formatted }],
+        };
+      }
+
+      case "move_file": {
+        const parsed = MoveFileArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for move_file: ${parsed.error}`);
+        }
+        const validSourcePath = await validatePath(parsed.data.source);
+        const validDestPath = await validatePath(parsed.data.destination);
+        await fs.rename(validSourcePath, validDestPath);
+        return {
+          content: [{ type: "text", text: `Successfully moved ${parsed.data.source} to ${parsed.data.destination}` }],
+        };
+      }
+
+      case "search_files": {
+        const parsed = SearchFilesArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for search_files: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        const results = await searchFiles(validPath, parsed.data.pattern);
+        return {
+          content: [{ type: "text", text: results.length > 0 ? results.join("\n") : "No matches found" }],
+        };
+      }
+
+      case "get_file_info": {
+        const parsed = GetFileInfoArgsSchema.safeParse(args);
+        if (!parsed.success) {
+          throw new Error(`Invalid arguments for get_file_info: ${parsed.error}`);
+        }
+        const validPath = await validatePath(parsed.data.path);
+        const info = await getFileStats(validPath);
+        return {
+          content: [{ type: "text", text: Object.entries(info)
+            .map(([key, value]) => `${key}: ${value}`)
+            .join("\n") }],
+        };
+      }
+
+      case "list_allowed_directories": {
+        return {
+          content: [{ 
+            type: "text", 
+            text: `Allowed directories:\n${allowedDirectories.join('\n')}` 
+          }],
+        };
+      }
+
+      default:
+        throw new Error(`Unknown tool: ${name}`);
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    return {
+      content: [{ type: "text", text: `Error: ${errorMessage}` }],
+      isError: true,
+    };
+  }
+});
+
+// Start server
+async function runServer() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error("Secure MCP Filesystem Server running on stdio");
+  console.error("Allowed directories:", allowedDirectories);
+}
+
+runServer().catch((error) => {
+  console.error("Fatal error running server:", error);
+  process.exit(1);
+});
--- a/src/filesystem/package.json
+++ b/src/filesystem/package.json
@@ -0,0 +1,30 @@
+{
+  "name": "@modelcontextprotocol/server-filesystem",
+  "version": "0.1.0",
+  "description": "MCP server for filesystem access",
+  "license": "MIT",
+  "author": "Anthropic, PBC (https://anthropic.com)",
+  "homepage": "https://modelcontextprotocol.io",
+  "bugs": "https://github.com/modelcontextprotocol/servers/issues",
+  "type": "module",
+  "bin": {
+    "mcp-server-filesystem": "dist/index.js"
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsc && shx chmod +x dist/*.js",
+    "prepare": "npm run build",
+    "watch": "tsc --watch"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "0.5.0",
+    "glob": "^10.3.10"
+  },
+  "devDependencies": {
+    "@types/node": "^20.11.0",
+    "shx": "^0.3.4",
+    "typescript": "^5.3.3"
+  }
+}
--- a/src/filesystem/tsconfig.json
+++ b/src/filesystem/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": ".",
+    "moduleResolution": "NodeNext",
+    "module": "NodeNext"
+  },
+  "include": [
+    "./**/*.ts"
+  ]
+}