feat(compat): add types/typesVersions fields for legacy moduleResolution: node

felixweinberger · felixweinberger · commit a2ddfc19a9b0 · 2026-04-16T19:34:56.000Z
diff --git a/.changeset/legacy-module-resolution-types.md b/.changeset/legacy-module-resolution-types.md
@@ -0,0 +1,10 @@
+---
+'@modelcontextprotocol/client': patch
+'@modelcontextprotocol/server': patch
+'@modelcontextprotocol/node': patch
+'@modelcontextprotocol/express': patch
+'@modelcontextprotocol/fastify': patch
+'@modelcontextprotocol/hono': patch
+---
+
+Add top-level `types` field (and `typesVersions` on client/server for their subpath exports) so consumers on legacy `moduleResolution: "node"` can resolve type declarations. The `exports` map remains the source of truth for `nodenext`/`bundler` resolution. The `typesVersions` map includes entries for subpaths added by sibling PRs in this series (`zod-schemas`, `stdio`); those entries are no-ops until the corresponding `dist/*.d.mts` files exist.
diff --git a/packages/client/package.json b/packages/client/package.json
@@ -92,5 +92,12 @@
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools",
         "tsdown": "catalog:devTools"
+    },
+    "types": "./dist/index.d.mts",
+    "typesVersions": {
+        "*": {
+            "validators/cf-worker": ["dist/validators/cfWorker.d.mts"],
+            "stdio": ["dist/stdio.d.mts"]
+        }
     }
 }
diff --git a/packages/middleware/express/package.json b/packages/middleware/express/package.json
@@ -63,5 +63,6 @@
         "typescript": "catalog:devTools",
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools"
-    }
+    },
+    "types": "./dist/index.d.mts"
 }
diff --git a/packages/middleware/fastify/package.json b/packages/middleware/fastify/package.json
@@ -61,5 +61,6 @@
         "typescript": "catalog:devTools",
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools"
-    }
+    },
+    "types": "./dist/index.d.mts"
 }
diff --git a/packages/middleware/hono/package.json b/packages/middleware/hono/package.json
@@ -61,5 +61,6 @@
         "typescript": "catalog:devTools",
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools"
-    }
+    },
+    "types": "./dist/index.d.mts"
 }
diff --git a/packages/middleware/node/package.json b/packages/middleware/node/package.json
@@ -67,5 +67,6 @@
         "typescript": "catalog:devTools",
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools"
-    }
+    },
+    "types": "./dist/index.d.mts"
 }
diff --git a/packages/server/package.json b/packages/server/package.json
@@ -87,5 +87,19 @@
         "typescript": "catalog:devTools",
         "typescript-eslint": "catalog:devTools",
         "vitest": "catalog:devTools"
+    },
+    "types": "./dist/index.d.mts",
+    "typesVersions": {
+        "*": {
+            "validators/cf-worker": [
+                "dist/validators/cfWorker.d.mts"
+            ],
+            "zod-schemas": [
+                "dist/zodSchemas.d.mts"
+            ],
+            "stdio": [
+                "dist/stdio.d.mts"
+            ]
+        }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -92,5 +92,12 @@`
`92`	`92`	`"typescript-eslint": "catalog:devTools",`
`93`	`93`	`"vitest": "catalog:devTools",`
`94`	`94`	`"tsdown": "catalog:devTools"`
	`95`	`+ },`
	`96`	`+ "types": "./dist/index.d.mts",`
	`97`	`+ "typesVersions": {`
	`98`	`+ "*": {`
	`99`	`+ "validators/cf-worker": ["dist/validators/cfWorker.d.mts"],`
	`100`	`+ "stdio": ["dist/stdio.d.mts"]`
	`101`	`+ }`
`95`	`102`	`}`
`96`	`103`	`}`
Original file line number	Diff line number	Diff line change
`@@ -63,5 +63,6 @@`
`63`	`63`	`"typescript": "catalog:devTools",`
`64`	`64`	`"typescript-eslint": "catalog:devTools",`
`65`	`65`	`"vitest": "catalog:devTools"`
`66`		`- }`
	`66`	`+ },`
	`67`	`+ "types": "./dist/index.d.mts"`
`67`	`68`	`}`
Original file line number	Diff line number	Diff line change
`@@ -61,5 +61,6 @@`
`61`	`61`	`"typescript": "catalog:devTools",`
`62`	`62`	`"typescript-eslint": "catalog:devTools",`
`63`	`63`	`"vitest": "catalog:devTools"`
`64`		`- }`
	`64`	`+ },`
	`65`	`+ "types": "./dist/index.d.mts"`
`65`	`66`	`}`
Original file line number	Diff line number	Diff line change
`@@ -67,5 +67,6 @@`
`67`	`67`	`"typescript": "catalog:devTools",`
`68`	`68`	`"typescript-eslint": "catalog:devTools",`
`69`	`69`	`"vitest": "catalog:devTools"`
`70`		`- }`
	`70`	`+ },`
	`71`	`+ "types": "./dist/index.d.mts"`
`71`	`72`	`}`