2021-12-10-advent-calendar-2021-sample5.ts

// .msw/openAPISpec.ts
export const endpoints = [
  "/sample-endpoint",
] as const;

export type Endpoints = typeof endpoints[number];

export type Methods = "get" | "post" | "put" | "delete";

type ExampleKindAndResponseType = {
  "/sample-endpoint": {
    get: {
      responseType: SampleEndpointResponse;
      exampleKind:
        | "example1"
        | "example2"
    };
    put: never;
    post: never;
    delete: never;
  };
};

export type ExampleKind<
  Path extends Endpoints,
  Method extends Methods
> = ExampleKindAndResponseType[Path][Method]["exampleKind"];

export type ResponseType<
  Path extends Endpoints,
  Method extends Methods
> = ExampleKindAndResponseType[Path][Method]["responseType"];

export type OpenAPISpec = {
  paths: {
    [Path in Endpoints]: {
      [Method in Methods]: {
        description: string;
        operationId: string;
        parameters: Record<string, unknown>[];
        tags: string[];
        responses: {
          [status: string]: {
            description: string;
            content: {
              "application/json": {
                schema: Record<string, unknown>;
                example?: ResponseType<Path, Method>;
                examples?: {
                  [Example in ExampleKind<Path, Method>]: {
                    value: ResponseType<Path, Method>;
                  };
                };
              };
            };
          };
        };
      };
    };
  };
};