CD
Cloudflare Developers•4w ago
Kiwi

Vitest monorepo service bindings and "The RPC receiver does not implement the method"

I have a monorepo that looks something like this: 
/packages/api/{my hono server with Services bindings}
/packages/services/
/packages/services/src/FooService
/packages/services/src/UsersService
/packages/api/{my hono server with Services bindings}
/packages/services/
/packages/services/src/FooService
/packages/services/src/UsersService
The API package has wrangler service bindings to the Services package. 
// api/wrangler.jsonc
 "services": [{
     "binding": "FOO_SERVICE",
     "service": "my-services",
     "entrypoint": "FooService"
   },
   {
     "binding": "USERS_SERVICE",
     "service": "my-services",
     "entrypoint": "UsersService"
   }]
// api/wrangler.jsonc
 "services": [{
     "binding": "FOO_SERVICE",
     "service": "my-services",
     "entrypoint": "FooService"
   },
   {
     "binding": "USERS_SERVICE",
     "service": "my-services",
     "entrypoint": "UsersService"
   }]
I’m using Vite and Vitest for testing the API package with the following vitest config 
// api/vitest.config.ts
export default defineWorkersProject(async () => {
 return {
   test: {
    // … more setup
     poolOptions: {
       workers: {
         wrangler: { configPath: `${__dirname}/wrangler.jsonc`, environment: 'test' },
         singleWorker: true,
         miniflare: {
           bindings: {
             TEST_MIGRATIONS: migrations,
             TEST_SEED_FILES: seedFiles,
           },
           serviceBindings: {
             USERS_SERVICE: { name: 'my-services', entrypoint: 'UsersService' },
             FOO_SERVICE: { name: 'my-services', entryPoint: 'FooService' },
           },
           workers: [
             { // built by globalSetup.ts, coped into this directory
               name: my-services',
               modules: true,
               scriptPath: './.test/workers/services/my_services/index.js',
               compatibilityDate: '2025-01-01',
               compatibilityFlags: ['nodejs_compat'],
             },
           ],
         },
       },
     },
   },
 };
});
// api/vitest.config.ts
export default defineWorkersProject(async () => {
 return {
   test: {
    // … more setup
     poolOptions: {
       workers: {
         wrangler: { configPath: `${__dirname}/wrangler.jsonc`, environment: 'test' },
         singleWorker: true,
         miniflare: {
           bindings: {
             TEST_MIGRATIONS: migrations,
             TEST_SEED_FILES: seedFiles,
           },
           serviceBindings: {
             USERS_SERVICE: { name: 'my-services', entrypoint: 'UsersService' },
             FOO_SERVICE: { name: 'my-services', entryPoint: 'FooService' },
           },
           workers: [
             { // built by globalSetup.ts, coped into this directory
               name: my-services',
               modules: true,
               scriptPath: './.test/workers/services/my_services/index.js',
               compatibilityDate: '2025-01-01',
               compatibilityFlags: ['nodejs_compat'],
             },
           ],
         },
       },
     },
   },
 };
});
With this setup I currently get an error of the following shape TypeError: The RPC receiver does not implement the method "getFoo". when calling c.env.FOO_SERVICE.getFoo(). What’s the right way to tackle this?
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