The generateBundle type should be

(options: OutputOptions, bundle: OutputBundle, isWrite: boolean) => void

The writeBundle type should be

(options: OutputOptions, bundle: OutputBundle) => void

Current implementation is not correct at now, see https://github.com/rolldown/rolldown/blob/main/packages/rolldown/src/plugin/bindingify-output-hooks.ts#L6-L29.

Here already has a util convert BindingOutputsto OutputBundle. See https://github.com/rolldown/rolldown/blob/main/packages/rolldown/src/utils/transform-to-rollup-output.ts#L67-L71.

The test should be enabled at https://github.com/rolldown/rolldown/blob/main/packages/rolldown/tests/fixtures/plugin/generate-bundle/_config.ts#L11 and https://github.com/rolldown/rolldown/blob/main/packages/rolldown/tests/fixtures/plugin/write-bundle/_config.ts#L11. You should also add test outputOption assert.