DTK0001: RPC Function Already Registered

Package: @vitejs/devtools-rpc

Message

RPC function "{name}" is already registered

Cause

This error is thrown by RpcFunctionsCollectorBase.register() when you attempt to register an RPC function with a name that already exists in the collector. Each function name must be unique within a collector instance unless you explicitly opt into overwriting.

Example

import { defineRpcFunction } from '@vitejs/devtools-kit'

const getVersion = defineRpcFunction({
  name: 'my-plugin:get-version',
  type: 'static',
  handler: () => '1.0.0',
})

const getVersionAlt = defineRpcFunction({
  name: 'my-plugin:get-version', // same name as above
  type: 'static',
  handler: () => '2.0.0',
})

// First registration succeeds
collector.register(getVersion)

// Second registration throws DTK0001
collector.register(getVersionAlt)

Fix

Either use a unique name for each function, or pass force: true to overwrite the existing registration:

// Option 1: Use a unique name
const getVersionAlt = defineRpcFunction({
  name: 'my-plugin:get-version-alt',
  type: 'static',
  handler: () => '2.0.0',
})
collector.register(getVersionAlt)

// Option 2: Force overwrite
collector.register(getVersionAlt, true)

Source

packages/rpc/src/collector.ts