Stricter TypeScript (#40)

Author: AlexanderKolberg

_examples/node-ts/server-fastify/index.ts

@@ -110,7 +110,7 @@ app.get('/json', async (req, reply) => {
 })
 
 // Fallback 404 handler for all unmatched routes
-app.setNotFoundHandler((req, reply) => {
+app.setNotFoundHandler((_req, reply) => {
   reply.code(404).send({ msg: 'not found' })
 })
 

_examples/node-ts/server-fastify/package.json

@@ -2,6 +2,7 @@
   "name": "node-ts-server",
   "version": "1.0.0",
   "description": "",
+  "type": "module",
   "main": "index.js",
   "scripts": {
     "start": "tsx index.ts"
@@ -11,9 +12,10 @@
   "license": "ISC",
   "packageManager": "[email protected]",
   "devDependencies": {
+    "@fastify/cors": "^11.1.0",
+    "@tsconfig/strictest": "^2.0.6",
     "@types/node": "^24.8.1",
     "fastify": "^5.6.1",
-    "@fastify/cors": "^11.1.0",
     "tsx": "^4.20.6",
     "typescript": "^5.9.3"
   }

_examples/node-ts/server-fastify/pnpm-lock.yaml

@@ -82,7 +82,7 @@ export const serveExampleRpc = async <Context>(service: ExampleServer<Context>,
   if (!urlPath.startsWith('/rpc/')) return null
   const parts = urlPath.split('/').filter(Boolean)
   if (parts.length !== 3 || parts[0] !== 'rpc' || parts[1] !== 'Example') return null
-  const method = parts[2]
+  const method = parts[2]!
   try {
     const result = await dispatchExampleRequest(service, ctx, method, body)
     return {
@@ -235,19 +235,16 @@ const validateType = (value: any, type: string) => {
 type WebrpcErrorParams = { name?: string, code?: number, message?: string, status?: number, cause?: string }
 
 export class WebrpcError extends Error {
-  name: string
   code: number
-  message: string
   status: number
-  cause?: string
 
   constructor(error: WebrpcErrorParams = {}) {
     super(error.message)
     this.name = error.name || 'WebrpcEndpointError'
     this.code = typeof error.code === 'number' ? error.code : 0
     this.message = error.message || `endpoint error`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcError.prototype)
   }
 
@@ -264,7 +261,7 @@ export class WebrpcEndpointError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 0
     this.message = error.message || `endpoint error`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcEndpointError.prototype)
   }
 }
@@ -276,7 +273,7 @@ export class WebrpcRequestFailedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -1
     this.message = error.message || `request failed`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcRequestFailedError.prototype)
   }
 }
@@ -288,7 +285,7 @@ export class WebrpcBadRouteError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -2
     this.message = error.message || `bad route`
     this.status = typeof error.status === 'number' ? error.status : 404
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcBadRouteError.prototype)
   }
 }
@@ -300,7 +297,7 @@ export class WebrpcBadMethodError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -3
     this.message = error.message || `bad method`
     this.status = typeof error.status === 'number' ? error.status : 405
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcBadMethodError.prototype)
   }
 }
@@ -312,7 +309,7 @@ export class WebrpcBadRequestError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -4
     this.message = error.message || `bad request`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcBadRequestError.prototype)
   }
 }
@@ -324,7 +321,7 @@ export class WebrpcBadResponseError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -5
     this.message = error.message || `bad response`
     this.status = typeof error.status === 'number' ? error.status : 500
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcBadResponseError.prototype)
   }
 }
@@ -336,7 +333,7 @@ export class WebrpcServerPanicError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -6
     this.message = error.message || `server panic`
     this.status = typeof error.status === 'number' ? error.status : 500
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcServerPanicError.prototype)
   }
 }
@@ -348,7 +345,7 @@ export class WebrpcInternalErrorError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -7
     this.message = error.message || `internal error`
     this.status = typeof error.status === 'number' ? error.status : 500
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcInternalErrorError.prototype)
   }
 }
@@ -360,7 +357,7 @@ export class WebrpcClientAbortedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -8
     this.message = error.message || `request aborted by client`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcClientAbortedError.prototype)
   }
 }
@@ -372,7 +369,7 @@ export class WebrpcStreamLostError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -9
     this.message = error.message || `stream lost`
     this.status = typeof error.status === 'number' ? error.status : 400
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcStreamLostError.prototype)
   }
 }
@@ -384,7 +381,7 @@ export class WebrpcStreamFinishedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : -10
     this.message = error.message || `stream finished`
     this.status = typeof error.status === 'number' ? error.status : 200
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, WebrpcStreamFinishedError.prototype)
   }
 }
@@ -401,7 +398,7 @@ export class UnauthorizedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1000
     this.message = error.message || `Unauthorized access`
     this.status = typeof error.status === 'number' ? error.status : 401
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, UnauthorizedError.prototype)
   }
 }
@@ -413,7 +410,7 @@ export class PermissionDeniedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1001
     this.message = error.message || `Permission denied`
     this.status = typeof error.status === 'number' ? error.status : 403
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, PermissionDeniedError.prototype)
   }
 }
@@ -425,7 +422,7 @@ export class SessionExpiredError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1002
     this.message = error.message || `Session expired`
     this.status = typeof error.status === 'number' ? error.status : 403
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, SessionExpiredError.prototype)
   }
 }
@@ -437,7 +434,7 @@ export class GeoblockedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1003
     this.message = error.message || `Geoblocked region`
     this.status = typeof error.status === 'number' ? error.status : 451
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, GeoblockedError.prototype)
   }
 }
@@ -449,7 +446,7 @@ export class RateLimitedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1004
     this.message = error.message || `Rate-limited. Please slow down.`
     this.status = typeof error.status === 'number' ? error.status : 429
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, RateLimitedError.prototype)
   }
 }
@@ -461,7 +458,7 @@ export class CorsDisallowedError extends WebrpcError {
     this.code = typeof error.code === 'number' ? error.code : 1005
     this.message = error.message || `CORS disallowed. JWT can't be used from a web app.`
     this.status = typeof error.status === 'number' ? error.status : 403
-    this.cause = error.cause
+    if (error.cause !== undefined) this.cause = error.cause
     Object.setPrototypeOf(this, CorsDisallowedError.prototype)
   }
 }

_examples/node-ts/server-fastify/server.gen.ts

@@ -1,11 +1,9 @@
 {
+  "extends": "@tsconfig/strictest/tsconfig.json",
   "compilerOptions": {
     "target": "ES2022",
     "module": "NodeNext",
     "moduleResolution": "NodeNext",
-    "strict": true,
-    "esModuleInterop": true,
-    "skipLibCheck": true,
     "resolveJsonModule": true,
     "types": ["node"]
   },

_examples/node-ts/server-fastify/tsconfig.json

@@ -2,6 +2,7 @@
   "name": "node-ts-server",
   "version": "1.0.0",
   "description": "",
+  "type": "module",
   "main": "index.js",
   "scripts": {
     "start": "tsx index.ts"
@@ -12,11 +13,10 @@
   "packageManager": "[email protected]",
   "devDependencies": {
     "@hono/node-server": "^1.13.3",
+    "@tsconfig/strictest": "^2.0.6",
     "@types/node": "^24.8.1",
     "hono": "^4.4.7",
     "tsx": "^4.20.6",
     "typescript": "^5.9.3"
-  },
-  "dependencies": {
   }
 }