KUBB_ADAPTER_REQUIRED: Adapter required

Code: KUBB_ADAPTER_REQUIRED Level: error

An action needs an adapter but none is configured.

What happened

The adapter turns your spec into the AST that plugins generate from, and must be set before any plugin runs. This diagnostic is defined in Kubb's diagnostic catalog, but no code path in the current source reports it: defineConfig (the standard entry point, used in the example below) always fills in a default adapter (adapterOas()) when adapter is omitted, so a config without an explicit adapter never triggers it today.

How to fix it

Set adapter in kubb.config.ts.

kubb.config.ts

import { defineConfig } from 'kubb/config'
import { adapterOas } from '@kubb/adapter-oas'

export default defineConfig({
  input: './petStore.yaml',
  output: { path: './src/gen' },
  adapter: adapterOas(),
  plugins: [/* ... */],
})

Example output

Terminal

[KUBB_ADAPTER_REQUIRED]: An adapter is required, but none is configured.
  fix: Set `adapter` in kubb.config.ts (for example `adapterOas()`).
  see: https://kubb.dev/docs/5.x/reference/diagnostics/kubb-adapter-required

See also

• Adapters
• Configuration
• Diagnostics reference