[v2] Proof of Concept: monorepo, package split

common/eslint-config/eslint.config.mjs

@@ -0,0 +1,46 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import eslintConfigPrettier from 'eslint-config-prettier/flat';
+import nodePlugin from 'eslint-plugin-n';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export default tseslint.config(
+    eslint.configs.recommended,
+    ...tseslint.configs.recommended,
+    {
+        languageOptions: {
+            parserOptions: {
+                // Ensure consumers of this shared config get a stable tsconfig root
+                tsconfigRootDir: __dirname
+            }
+        },
+        linterOptions: {
+            reportUnusedDisableDirectives: false
+        },
+        plugins: {
+            n: nodePlugin
+        },
+        rules: {
+            '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+            'n/prefer-node-protocol': 'error'
+        }
+    },
+    {
+        // Ignore generated protocol types everywhere
+        ignores: ['**/spec.types.ts']
+    },
+    {
+        files: ['src/client/**/*.ts', 'src/server/**/*.ts'],
+        ignores: ['**/*.test.ts'],
+        rules: {
+            'no-console': 'error'
+        }
+    },
+    eslintConfigPrettier
+);
+

eslint.config.mjs → common/eslint-config/eslint.config.ts

@@ -1,9 +1,9 @@
 // @ts-check
 
-import eslint from '@eslint/js';
+import * as eslint from '@eslint/js';
 import tseslint from 'typescript-eslint';
-import eslintConfigPrettier from 'eslint-config-prettier/flat';
-import nodePlugin from 'eslint-plugin-n';
+import * as eslintConfigPrettier from 'eslint-config-prettier/flat';
+import * as nodePlugin from 'eslint-plugin-n';
 
 export default tseslint.config(
     eslint.configs.recommended,

common/eslint-config/package.json

@@ -0,0 +1,34 @@
+{
+    "name": "@modelcontextprotocol/eslint-config",
+    "private": true,
+    "main": "eslint.config.mjs",
+    "type": "module",
+    "exports": {
+        ".": "./eslint.config.mjs"
+    },
+    "dependencies": {
+        "typescript": "catalog:"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk.git"
+    },
+    "bugs": {
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk/issues"
+    },
+    "homepage": "https://github.com/modelcontextprotocol/typescript-sdk/tree/develop/common/eslint-config",
+    "publishConfig": {
+        "registry": "https://npm.pkg.github.com/"
+    },
+    "version": "2.0.0",
+    "devDependencies": {
+        "@modelcontextprotocol/tsconfig": "workspace:^",
+        "eslint": "^9.8.0",
+        "eslint-config-prettier": "^10.1.8",
+        "eslint-plugin-n": "^17.23.1",
+        "prettier": "3.6.2",
+        "typescript": "^5.5.4",
+        "typescript-eslint": "^8.48.1",
+        "@eslint/js": "^9.39.1"
+    }
+}

common/eslint-config/tsconfig.json

@@ -0,0 +1,8 @@
+{
+    "extends": "@modelcontextprotocol/tsconfig",
+    "include": ["./"],
+    "exclude": ["node_modules", "dist"],
+    "compilerOptions": {
+        "baseUrl": "."
+    }
+}

common/tsconfig/package.json

@@ -0,0 +1,21 @@
+{
+    "name": "@modelcontextprotocol/tsconfig",
+    "private": true,
+    "main": "tsconfig.json",
+    "type": "module",
+    "dependencies": {
+        "typescript": "catalog:"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk.git"
+    },
+    "bugs": {
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk/issues"
+    },
+    "homepage": "https://github.com/modelcontextprotocol/typescript-sdk/tree/develop/common/ts-config",
+    "publishConfig": {
+        "registry": "https://npm.pkg.github.com/"
+    },
+    "version": "2.0.0"
+}

tsconfig.json → common/tsconfig/tsconfig.json

@@ -17,7 +17,5 @@
             "pkce-challenge": ["./node_modules/pkce-challenge/dist/index.node"]
         },
         "types": ["node", "vitest/globals"]
-    },
-    "include": ["src/**/*", "test/**/*"],
-    "exclude": ["node_modules", "dist"]
-}
+    }
+}

common/vitest-config/package.json

@@ -0,0 +1,28 @@
+{
+    "name": "@modelcontextprotocol/vitest-config",
+    "private": true,
+    "main": "vitest.config.mjs",
+    "type": "module",
+    "exports": {
+        ".": "./vitest.config.mjs",
+        "./tsconfig.json": "./tsconfig.json"
+    },
+    "dependencies": {
+        "typescript": "catalog:"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk.git"
+    },
+    "bugs": {
+        "url": "https://github.com/modelcontextprotocol/typescript-sdk/issues"
+    },
+    "homepage": "https://github.com/modelcontextprotocol/typescript-sdk/tree/develop/common/vitest-config",
+    "publishConfig": {
+        "registry": "https://npm.pkg.github.com/"
+    },
+    "version": "2.0.0",
+    "devDependencies": {
+        "@modelcontextprotocol/tsconfig": "workspace:^"
+    }
+}

common/vitest-config/tsconfig.json

@@ -0,0 +1,8 @@
+{
+    "extends": "@modelcontextprotocol/tsconfig",
+    "include": ["./"],
+    "exclude": ["node_modules", "dist"],
+    "compilerOptions": {
+        "baseUrl": "."
+    }
+}

common/vitest-config/vitest.config.mjs

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+    test: {
+        globals: true,
+        environment: 'node',
+        setupFiles: ['./vitest.setup.ts'],
+        include: ['test/**/*.test.ts']
+    }
+});
+
+

common/vitest-config/vitest.setup.ts

@@ -0,0 +1,8 @@
+import { webcrypto } from 'node:crypto';
+
+// Polyfill globalThis.crypto for environments (e.g. Node 18) where it is not defined.
+// This is necessary for the tests to run in Node 18, specifically for the jose library, which relies on the globalThis.crypto object.
+if (typeof globalThis.crypto === 'undefined') {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (globalThis as any).crypto = webcrypto as unknown as Crypto;
+}

packages/client/eslint.config.mjs

@@ -0,0 +1,7 @@
+// @ts-check
+
+import baseConfig from '@modelcontextprotocol/eslint-config';
+
+export default baseConfig;
+
+

packages/client/package.json

@@ -0,0 +1,110 @@
+{
+    "name": "@modelcontextprotocol/sdk-client",
+    "version": "2.0.0-alpha.0",
+    "description": "Model Context Protocol implementation for TypeScript",
+    "license": "MIT",
+    "author": "Anthropic, PBC (https://anthropic.com)",
+    "homepage": "https://modelcontextprotocol.io",
+    "bugs": "https://github.com/modelcontextprotocol/typescript-sdk/issues",
+    "type": "module",
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/modelcontextprotocol/typescript-sdk.git"
+    },
+    "engines": {
+        "node": ">=18"
+    },
+    "keywords": [
+        "modelcontextprotocol",
+        "mcp"
+    ],
+    "exports": {
+        ".": {
+            "import": "./dist/index.js"
+        }
+    },
+    "typesVersions": {
+        "*": {
+            "*": [
+                "./dist/*"
+            ]
+        }
+    },
+    "files": [
+        "dist"
+    ],
+    "scripts": {
+        "fetch:spec-types": "tsx scripts/fetch-spec-types.ts",
+        "typecheck": "tsgo --noEmit",
+        "build": "npm run build:esm",
+        "build:esm": "mkdir -p dist && echo '{\"type\": \"module\"}' > dist/package.json && tsc -p tsconfig.prod.json",
+        "build:esm:w": "npm run build:esm -- -w",
+        "examples:simple-server:w": "tsx --watch src/examples/server/simpleStreamableHttp.ts --oauth",
+        "prepack": "npm run build:esm && npm run build:cjs",
+        "lint": "eslint src/ && prettier --check .",
+        "lint:fix": "eslint src/ --fix && prettier --write .",
+        "check": "npm run typecheck && npm run lint",
+        "test": "vitest run",
+        "test:watch": "vitest",
+        "start": "npm run server",
+        "server": "tsx watch --clear-screen=false scripts/cli.ts server",
+        "client": "tsx scripts/cli.ts client"
+    },
+    "dependencies": {
+        "@modelcontextprotocol/shared": "workspace:^",
+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
+        "content-type": "^1.0.5",
+        "cors": "^2.8.5",
+        "cross-spawn": "^7.0.5",
+        "eventsource": "^3.0.2",
+        "eventsource-parser": "^3.0.0",
+        "express": "^5.0.1",
+        "express-rate-limit": "^7.5.0",
+        "jose": "^6.1.1",
+        "json-schema-typed": "^8.0.2",
+        "pkce-challenge": "^5.0.0",
+        "raw-body": "^3.0.0",
+        "zod": "^3.25 || ^4.0",
+        "zod-to-json-schema": "^3.25.0"
+    },
+    "peerDependencies": {
+        "@cfworker/json-schema": "^4.1.1",
+        "zod": "^3.25 || ^4.0"
+    },
+    "peerDependenciesMeta": {
+        "@cfworker/json-schema": {
+            "optional": true
+        },
+        "zod": {
+            "optional": false
+        }
+    },
+    "devDependencies": {
+        "@modelcontextprotocol/tsconfig": "workspace:^",
+        "@modelcontextprotocol/vitest-config": "workspace:^",
+        "@modelcontextprotocol/eslint-config": "workspace:^",
+        "@cfworker/json-schema": "^4.1.1",
+        "@eslint/js": "^9.39.1",
+        "@types/content-type": "^1.1.8",
+        "@types/cors": "^2.8.17",
+        "@types/cross-spawn": "^6.0.6",
+        "@types/eventsource": "^1.1.15",
+        "@types/express": "^5.0.0",
+        "@types/express-serve-static-core": "^5.1.0",
+        "@types/node": "^22.12.0",
+        "@types/supertest": "^6.0.2",
+        "@types/ws": "^8.5.12",
+        "@typescript/native-preview": "^7.0.0-dev.20251103.1",
+        "eslint": "^9.8.0",
+        "eslint-config-prettier": "^10.1.8",
+        "eslint-plugin-n": "^17.23.1",
+        "prettier": "3.6.2",
+        "supertest": "^7.0.0",
+        "tsx": "^4.16.5",
+        "typescript": "^5.5.4",
+        "typescript-eslint": "^8.48.1",
+        "vitest": "^4.0.8",
+        "ws": "^8.18.0"
+    }
+}