docs(typed-express-router): Refactor documentation into Diátaxis Reference section

website/docs/reference/superagent-wrapper/api-client.md

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+# API Client Usage
+
+This page describes the structure and methods of the type-safe API client object that
+the [`buildApiClient`](./build-api-client) function returns.
+
+## `ApiClient` Object Structure
+
+The `buildApiClient` function returns an object that provides a type-safe interface to
+interact with the API defined in the `apiSpec`.
+
+**Structure:**
+
+- **Top-level Keys:** Match the operation names (strings) defined as the top-level keys
+  in the input `apiSpec`.
+- **Nested Keys:** Under each operation name key, the keys match the HTTP methods (e.g.,
+  `'get'`, `'put'`) defined for that operation in the `apiSpec`.
+- **Method Functions:** The value associated with each HTTP method key is a function
+  representing the API call for that specific route.
+
+## Operation Method (e.g., `client[opName].method(props)`)
+
+**Parameters:**
+
+- `props` (Object): A single argument object. Its type is inferred from the _decoded
+  type_ of the `request` codec associated with this specific route
+  (`apiSpec[opName][method].request`). This object contains the combined, flattened
+  properties expected by the route (path params, query params, headers, body properties
+  all merged into one object). The `superagent-wrapper` handles encoding this object and
+  placing the properties into the correct parts of the HTTP request (path, query, body,
+  etc.) based on the `httpRequest` definition.
+
+**Return Value:**
+
+- `PreparedRequest`: An object containing the `.decode()` and `.decodeExpecting()`
+  methods for executing the request and handling the response.
+
+**Example Access:**
+
+```typescript
+declare const apiClient: any; // Assume apiClient was built previously
+// Assuming apiClient has type ApiClient<ExampleAPI> from the README example
+
+const putRequest = apiClient['api.example'].put({
+  // Type-checked against { id: number; example: { foo: string; bar: number; } }
+  id: 123,
+  example: { foo: 'data', bar: 456 },
+});
+// putRequest now holds an object with .decode() and .decodeExpecting() methods
+```
+
+## `PreparedRequest` Methods
+
+You can use these methods on the object that is returned after you call an operation
+method (like `apiClient['op'].put(...)`) but before the request is executed.
+
+### `.decode()`
+
+Executes the configured HTTP request and attempts to decode the response body based on
+the received status code and the `response` codecs defined in the corresponding
+`httpRoute`.
+
+**Signature:**
+
+```typescript
+// Conceptual representation - RouteDef would be the specific route definition type
+type ApiResponse<RouteDef> = {
+    status: number;
+    body: /* Union of all possible decoded response types for RouteDef | unknown */ any;
+    // Potentially other properties from superagent response (headers, etc.)
+    [key: string]: any; // To represent potential superagent pass-throughs
+};
+
+// Method signature on the PreparedRequest object
+// decode: () => Promise<ApiResponse</* Corresponding Route Definition */>>;
+decode(): Promise<ApiResponse<any>>; // Use 'any' if RouteDef is too complex to represent here
+```
+
+**Parameters:**
+
+- `expectedStatus` (`number`): The specific HTTP status code that is expected in the
+  response. This status code must be one of the keys defined in the `response` object of
+  the corresponding `httpRoute`.
+
+**Behavior:**
+
+1. Sends the HTTP request.
+2. Receives the HTTP response.
+3. Compares the received status code with expectedStatus.
+4. If status matches expectedStatus: Attempts to decode the response body using the
+   io-ts codec associated with expectedStatus in the httpRoute.
+   - If decoding succeeds, the Promise resolves with the SpecificApiResponse object.
+   - If decoding fails, the Promise is rejected with an error.
+5. If status does not match expectedStatus: The Promise is rejected with an error
+   indicating the status code mismatch.
+
+**Return Value:**
+
+- `Promise<SpecificApiResponse>`: A Promise that resolves with a `SpecificApiResponse`
+  object only if the received status matches `expectedStatus` and the body is
+  successfully decoded according to the corresponding codec. The `body` type in the
+  resolved object is narrowed specifically to the type defined for `expectedStatus`. If
+  the conditions are not met, the Promise rejects.
+
+## Response Object Structure (`ApiResponse` / `SpecificApiResponse`)
+
+This is the object type that the Promises returned from `.decode()` and
+`.decodeExpecting()` resolve to.
+
+**Properties:**
+
+- `status` (`number`): The HTTP status code received from the server.
+- `body` (`DecodedType | unknown`): The response body.
+  - For `.decode()`: The type is a union of all possible types successfully decoded
+    based on the status codes defined in the `httpRoute['response']` object. If the
+    status code was not defined or decoding failed, it might be `unknown` or hold raw
+    response data/error info.
+  - For `.decodeExpecting(status)`: The type is narrowed to the specific decoded type
+    associated with the `status` key in `httpRoute['response']`.
+
+**Type Narrowing:** TypeScript can effectively narrow the type of the `body` property
+when using conditional checks on the `status` property, especially after using
+`.decode()`:
+
+```typescript
+declare const apiClient: any; // Assume apiClient was built previously
+// Assuming apiClient has type ApiClient<ExampleAPI> from the README example
+
+async function exampleUsage() {
+  const response = await apiClient['api.example']
+    .put({ id: 1, example: { foo: '', bar: 0 } })
+    .decode();
+
+  if (response.status === 200) {
+    // response.body is now typed as the decoded type for status 200 (Example)
+    console.log(response.body.foo);
+  } else if (response.status === 400) {
+    // response.body is now typed as the decoded type for status 400 (GenericAPIError)
+    console.log(response.body.message);
+  } else {
+    // response.body might be unknown or some other type
+    const maybeError = response.body as any;
+    if (maybeError?.message) {
+      console.error('Unknown error:', maybeError.message);
+    }
+  }
+}
+```

website/docs/reference/superagent-wrapper/build-api-client.md

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+# BuildApiClient
+
+The `buildApiClient` function creates a type-safe API client by combining a request
+factory and an API specification.
+
+## Syntax
+
+```typescript
+import { ApiSpec } from '@api-ts/io-ts-http';
+
+function buildApiClient<T extends ApiSpec>(
+  requestFactory: RequestFactory,
+  apiSpec: T,
+): ApiClient<T>;
+
+// Types used by buildApiClient
+type RequestFactory = (method: string, path: string, options?: any) => any; // Returns a superagent/supertest request
+
+// ApiClient structure based on the input ApiSpec 'T'
+type ApiClient<T extends ApiSpec> = {
+  [OperationName in keyof T]: {
+    [MethodName in keyof T[OperationName]]: (
+      props: any, // Inferred from T[OperationName][MethodName]['request']
+    ) => PreparedRequest<T[OperationName][MethodName]>;
+  };
+};
+
+// Response types
+type ApiResponse<RouteDef> = {
+  status: number;
+  body: any;
+  // Additional properties from the response
+};
+
+type SpecificApiResponse<RouteDef, Status extends number> = {
+  status: Status;
+  body: any;
+  // Additional properties from the response
+};
+
+// Object returned before executing the request
+type PreparedRequest<RouteDef> = {
+  decode: () => Promise<ApiResponse<RouteDef>>;
+  decodeExpecting: (status: number) => Promise<SpecificApiResponse<RouteDef, number>>;
+};
+```
+
+## Parameters
+
+- `requestFactory`: A function that creates HTTP requests.
+
+  - Type: `RequestFactory`
+  - Source: Returned by `superagentRequestFactory` or `supertestRequestFactory`.
+
+- `apiSpec`: An object that defines the API structure, routes, requests, and responses.
+  - Type: `ApiSpec`
+  - Source: Created using `@api-ts/io-ts-http`'s `apiSpec` function.
+
+## Return Value
+
+- A strongly-typed object representing the API client.
+  - Type: `ApiClient<T>`
+  - See [API Client Usage](./api-client) for details on structure and methods.
+
+## Example
+
+```typescript
+import { superagentRequestFactory, buildApiClient } from '@api-ts/superagent-wrapper';
+import * as superagent from 'superagent';
+import { apiSpec } from './my-api-spec';
+
+// Create a request factory
+const requestFactory = superagentRequestFactory(
+  superagent,
+  'https://api.example.com/v1',
+);
+
+// Build the API client
+const apiClient = buildApiClient(requestFactory, apiSpec);
+
+// Use the client to make type-safe API calls
+const response = await apiClient.users.get({ id: 123 }).decode();
+```

website/docs/reference/superagent-wrapper/index.md

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+---
+sidebar_position: 3
+---
+
+# Superagent-Wrapper
+
+This reference describes the functions and client structure in the
+`@api-ts/superagent-wrapper` package. You can use this documentation to understand the
+parameters, return values, and behavior of each component.
+
+## Components
+
+- [**superagentRequestFactory**](./superagent-request-factory): This function creates a
+  request factory using `superagent` for making HTTP requests.
+- [**supertestRequestFactory**](./supertest-request-factory): This function creates a
+  request factory using `supertest` for testing HTTP servers.
+- [**buildApiClient**](./build-api-client): This function builds a type-safe API client
+  from a request factory and API specification.
+- [**API Client Usage**](./api-client): This page describes the structure and methods of
+  the client object returned by `buildApiClient`.
+
+## Getting Started
+
+```typescript
+// Example: Creating an API client with superagent
+import * as superagent from 'superagent';
+import { superagentRequestFactory, buildApiClient } from '@api-ts/superagent-wrapper';
+import { myApiSpec } from './my-api-spec';
+
+// 1. Create a request factory
+const requestFactory = superagentRequestFactory(
+  superagent,
+  'https://api.example.com/v1',
+);
+
+// 2. Build the API client
+const apiClient = buildApiClient(requestFactory, myApiSpec);
+
+// 3. Make API calls
+const response = await apiClient.users.get({ id: 123 }).decode();
+```

website/docs/reference/superagent-wrapper/superagent-request-factory.md

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+# SuperagentRequestFactory
+
+The `superagentRequestFactory` function creates a request factory function for making
+HTTP requests. This factory works with `buildApiClient` and uses `superagent` to handle
+the requests.
+
+## Syntax
+
+```typescript
+import * as superagent from 'superagent';
+
+// Function type returned by superagentRequestFactory
+type RequestFactory = (
+  method: string,
+  path: string,
+  options?: { params?: any; query?: any; headers?: any; body?: any },
+) => superagent.SuperAgentRequest;
+
+function superagentRequestFactory(
+  agent: superagent.SuperAgentStatic | superagent.SuperAgent<any>,
+  baseUrl: string,
+): RequestFactory;
+```
+
+## Parameters
+
+- `agent`: The superagent library object or a pre-configured superagent instance.
+
+  - Type: `superagent.SuperAgentStatic | superagent.SuperAgent<any>`
+  - Example: `superagent` or a custom agent
+
+- `baseUrl`: The base URL prepended to all request paths defined in the API
+  specification.
+  - Type: `string`
+  - Example: `"http://api.example.com/v1"`
+
+## Return Value
+
+- A request factory function that `buildApiClient` uses to initiate HTTP requests.
+  - Type: `RequestFactory`
+  - Takes HTTP method, path template, and request data (params, query, headers, body).
+  - Returns a `superagent` request object.
+
+## Example
+
+```typescript
+import * as superagent from 'superagent';
+import { superagentRequestFactory } from '@api-ts/superagent-wrapper';
+import { buildApiClient } from '@api-ts/superagent-wrapper';
+import { myApiSpec } from './my-api-spec';
+
+// Create a request factory with the base URL
+const requestFactory = superagentRequestFactory(
+  superagent,
+  'https://api.example.com/v1',
+);
+
+// Build the API client
+const apiClient = buildApiClient(requestFactory, myApiSpec);
+
+// Now you can use apiClient to make HTTP requests to the API
+```

website/docs/reference/superagent-wrapper/supertest-request-factory.md

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+# SupertestRequestFactory
+
+The `supertestRequestFactory` function creates a request factory function for testing
+HTTP servers. This factory works with `buildApiClient` and uses `supertest` to make HTTP
+requests.
+
+## Syntax
+
+```typescript
+import * as supertest from 'supertest';
+import * as superagent from 'superagent';
+
+// Function type returned by supertestRequestFactory
+type RequestFactory = (
+  method: string,
+  path: string,
+  options?: { params?: any; query?: any; headers?: any; body?: any },
+) => superagent.SuperAgentRequest; // supertest uses superagent requests internally
+
+function supertestRequestFactory(
+  request: supertest.SuperTest<supertest.Test>,
+): RequestFactory;
+```
+
+## Parameters
+
+- `request`: The request function created by initializing `supertest` with an HTTP
+  server or app instance.
+  - Type: `supertest.SuperTest<supertest.Test>`
+  - Example: `supertest(app)`
+
+## Return Value
+
+- A request factory function that `buildApiClient` uses to initiate HTTP requests.
+  - Type: `RequestFactory`
+  - Integrates with the provided `supertest` request function.
+
+## Example
+
+```typescript
+import * as supertest from 'supertest';
+import { supertestRequestFactory } from '@api-ts/superagent-wrapper';
+import { buildApiClient } from '@api-ts/superagent-wrapper';
+import { myApiSpec } from './my-api-spec';
+import express from 'express';
+
+// Create an Express app
+const app = express();
+
+// Initialize supertest with the app
+const request = supertest(app);
+
+// Create a request factory
+const requestFactory = supertestRequestFactory(request);
+
+// Build the API client
+const apiClient = buildApiClient(requestFactory, myApiSpec);
+
+// Now you can use apiClient for testing your Express app
+```