@codesandbox/sdk/dist/cjs/pitcher-protocol/types.d.ts

The CodeSandbox SDK

export type NestedKey<O> = {
    [K in Extract<keyof O, string>]: O[K] extends Array<any> ? K : O[K] extends any ? `${K}` | `${K}.${NestedKey<O[K]>}` : K;
}[Extract<keyof O, string>];