### Install Routopia

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Install the package using npm.

```bash
npm install routopia
```

--------------------------------

### Shorthand Syntax

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Using shorthand to define GET routes by omitting the HTTP method.

```APIDOC
## Shorthand Syntax

### Description
Define parameters directly to implicitly create a GET route.

### Usage
```ts
import { routes, empty, type } from 'routopia';

const myRoutes = routes({
  "/short/[param]": {
    params: { param: type as string },
    queries: { q: type as string | undefined },
    hash: type as string,
  },
});

myRoutes["/short/[param]"].get({ 
  params: { param: "abc" }, 
  queries: { q: "query" }, 
  hash: "anchor",
});
// => "/short/abc?q=query#anchor"
```
```

--------------------------------

### Define user domain routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Example of defining routes for a user domain using the custom abstraction layer.

```ts
// userRoutes.ts
import { createMyApiRoutes, schema } from './path/to/createMyApiRoutes';

export const userRoutes = createMyApiRoutes({
  "/users": schema.empty,
  "/users/[id]": {
    params: {
      id: schema.type as number,
    },
  },
});
```

--------------------------------

### Define post domain routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Example of defining routes for a post domain with various HTTP methods and parameters.

```ts
// postRoutes.ts
import { createMyApiRoutes, schema } from './path/to/createMyApiRoutes';

export const postRoutes = createMyApiRoutes({
  "/posts": {
    get: { queries: { q: schema.type as string | undefined } },
  },
  "/posts/[id]": {
    get: { params: { id: schema.type as number } },
    post: { params: { id: schema.type as number } },
    put: { params: { id: schema.type as number } },
    delete: { params: { id: schema.type as number } },
  },
});
```

--------------------------------

### Use Shorthand Notation

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Define endpoints directly without specifying an HTTP method, which defaults to GET.

```ts
import { routes, empty, type } from 'routopia';

const myRoutes = routes({
  "/short": empty,
  // = "/short": { get: empty }
  
  "/short/[param]": {
    params: {
      param: type as string,
    },
    queries: {
      q: type as string | undefined,
    },
    hash: type as string,
  },
  // = "/short/[param]": { get: { params: {...}, queries: {...}, hash: ... } }
});

// Use it by calling the `get` method
myRoutes["/short"].get();
// => "/short"

myRoutes["/short/[param]"].get({ 
  params: { param: "abc" }, 
  queries: { q: "query" }, 
  hash: "anchor",
});
// => "/short/abc?q=query#anchor"
```

--------------------------------

### Define and mock routes with updated syntax

Source: https://github.com/ykicchan/routopia/blob/main/CHANGELOG.md

Demonstrates the use of colon-based syntax for path parameters and catch-all parameters in route definitions.

```ts
const myRoutes = routes({
  "/users/[id]": { params: { id: type as string } },
  "/posts/[...slugs]": { params: { slugs: type as string[] } },
  "/tags/[[...tags]]": { params: { tags: type as string[] } },
});

myRoutes["/users/[id]"].mock(); // => "/users/:id"
myRoutes["/posts/[...slugs]"].mock(); // => "/posts/:slugs+"
myRoutes["/tags/[[...tags]]"].mock(); // => "/tags/:tags*"
```

--------------------------------

### Use Routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Construct URLs by calling the defined route methods with required parameters and queries.

```ts
import { myRoutes } from './path/to/myRoutes';

myRoutes["/users"].get();
myRoutes["/users"].post();
// => "/users"

myRoutes["/path/[id]"].get({ params: { id: 123 } });
// => "/path/123"

myRoutes["/path/[id]"].get({ params: { id: 123 }, queries: { q: "query" }  });
// => "/path/123?q=query"
```

--------------------------------

### Defining and Using Routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

How to define routes with query parameters and path parameters using the routes function.

```APIDOC
## Defining Routes

### Description
Use the `routes` function to define your API structure. You can specify query parameters, path parameters, and hashes.

### Usage
```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path": {
    get: {
      queries: {
        str: type as string,
        opt: type as string | undefined,
      },
      hash: type as string
    },
  },
});

// Generate URL
myRoutes["/path"].get({ 
  queries: { str: "value" },
  hash: "anchor"
});
```
```

--------------------------------

### Defining and Using Routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

How to define routes using the routes function and invoke them to generate URLs.

```APIDOC
## routes(definition)

### Description
Defines a set of routes with associated HTTP methods and parameter requirements.

### Parameters
- **definition** (object) - Required - An object where keys are path strings and values define the allowed methods (get, post, put, delete) and their parameter constraints.

### Usage Example
```ts
import { routes, empty } from 'routopia';

const myRoutes = routes({
  "/path": {
    get: empty,
    post: empty,
  },
});

myRoutes["/path"].get(); // => "/path"
```
```

--------------------------------

### Mocking URL construction

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Demonstrates basic usage of the mock method for path and query parameters, including automatic colon syntax for omitted parameters.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[num]": {
    params: { num: type as number },
    queries: {
      req: type as string,
      opt: type as number | undefined
    }
  }
});

myRoutes["/path/[num]"].mock()
myRoutes["/path/[num]"].get.mock()
// => "/path/:num"

myRoutes["/path/[num]"].mock({ params: { num: "abc" }, queries: { opt: "q" } })
myRoutes["/path/[num]"].get.mock({ params: { num: "abc" }, queries: { opt: "q" } })
// => "/path/abc?opt=q"

Parameters<(typeof myRoutes)["/path/[num]"]["mock"]>
Parameters<(typeof myRoutes)["/path/[num]"]["get"]["mock"]>
// ^? [{
//   params?: { num?: string | number } };
//   queries?: {
//     req?: string | number | boolean | string[]...;
//     opt?: string | number | boolean | string[]...;
//   };
// }]
```

--------------------------------

### Catch-all Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Defining routes that capture multiple path segments.

```APIDOC
## Catch-all Parameters

### Description
Use `[...param]` for required catch-all segments or `[[...param]]` for optional catch-all segments. These accept arrays of strings or numbers.

### Usage Example
```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[...slug]": {
    get: {
      params: {
        slug: type as string[],
      },
    },
  },
});

myRoutes["/path/[...slug]"].get({ params: { slug: ["a", "b"] } }); // => "/path/a/b"
```
```

--------------------------------

### Base URL Configuration

Source: https://github.com/ykicchan/routopia/blob/main/README.md

How to prefix routes with a base URL.

```APIDOC
## Base URL

### Description
Pass a string as the first argument to the `routes` function to prepend a base URL to all defined routes.

### Usage
```ts
import { routes, empty } from 'routopia';

const myApiRoutes = routes("https://api.example.com", {
  "/path": {
    get: empty,
  },
});

myApiRoutes["/path"].get();
// => "https://api.example.com/path"
```
```

--------------------------------

### Path Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Defining routes with dynamic path segments using bracket syntax.

```APIDOC
## Path Parameters

### Description
Use `[param]` syntax in route paths to define dynamic segments. Parameters are validated against the types defined in the `params` object.

### Usage Example
```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[id]": {
    get: {
      params: {
        id: type as number,
      },
    },
  },
});

myRoutes["/path/[id]"].get({ params: { id: 123 } }); // => "/path/123"
```
```

--------------------------------

### Consume defined API routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Demonstrates how to import and call the defined route handlers.

```ts
// Usage
import { userRoutes } from './path/to/userRoutes';
import { postRoutes } from './path/to/postRoutes';

userRoutes["/users"].get();
// => "https://api.example.com/users"

postRoutes["/posts/[id]"].get({ params: { id: 123 } });
// => "https://api.example.com/posts/123"
```

--------------------------------

### Combine HTTP Methods and Shorthand

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Demonstrates valid and invalid ways to mix shorthand and explicit HTTP method definitions.

```ts
import { routes, empty, type } from 'routopia';

// ❌: Cannot combine Shorthand notation with other method definitions within the same endpoint
const error = routes({
  "/short/mixed": {
    queries: { q: type as string },
    post: empty,
//  ^^^^^^^^^^^
  },
});

// ⚠️: Can be used together across different endpoints, but causes notation inconsistencies
const notGood = routes({
  "/hoge": empty,
//   :
  "/foo": { get: empty },
});

// ✅: Unify notation between endpoints within the same file
const good = routes({
  "/hoge": { get: empty },
//  :
  "/foo": { get: empty },
});

// ✅: Or split definition files and unify notation by domain
// hoge.ts
const hogeRoutes = routes({
  "/hoge": empty,
});
// foo.ts
const fooRoutes = routes({
  "/foo": { get: empty },
});
```

--------------------------------

### mock(options?: MockOptions)

Source: https://github.com/ykicchan/routopia/blob/main/README.md

The mock method is used to generate URL strings for testing. It accepts optional parameters for path, query, and hash values. If path parameters are omitted, they are replaced with colon syntax (e.g., :id).

```APIDOC
## mock(options?: MockOptions)

### Description
Generates a URL string based on defined route parameters. This method is intended for testing purposes only and does not perform URL encoding.

### Parameters
- **options** (Object) - Optional - An object containing optional `params`, `queries`, and `hash` fields.
  - **params** (Object) - Optional - Key-value pairs for path parameters.
  - **queries** (Object) - Optional - Key-value pairs for query parameters.
  - **hash** (string) - Optional - The hash fragment for the URL.

### Usage Example
```ts
// Using the mock method on an endpoint
myRoutes["/path/[num]"].mock({ params: { num: "abc" }, queries: { opt: "q" } });
// => "/path/abc?opt=q"

// Omitting parameters to use colon syntax
myRoutes["/path/[num]"].mock();
// => "/path/:num"
```
```

--------------------------------

### Configure Base URL

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Pass a string as the first argument to the routes function to prefix all generated paths with a base URL.

```ts
import { routes, empty } from 'routopia';

const myUsersRoutes = routes("/users", {
  "/path": {
    get: empty,
  },
});

myUsersRoutes["/path"].get();
// => "/users/path"

const myApiRoutes = routes("https://api.example.com", {
  "/path": {
    get: empty,
  },
});

myApiRoutes["/path"].get();
// => "https://api.example.com/path"
```

--------------------------------

### Mocking catch-all parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Shows how the mock method handles catch-all parameters defined as string arrays.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[...strArr]": {
    params: { strArr: type as string[] }
  }
});

Parameters<(typeof myRoutes)["/path/[...strArr]"]["mock"]>
Parameters<(typeof myRoutes)["/path/[...strArr]"]["get"]["mock"]>
// ^? [{ params?: { strArr?: string[] | number[] } }]
```

--------------------------------

### Define Catch-all Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Use [...param] for required catch-all segments or [[...param]] for optional ones, specifying the type as an array.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[...slug]": {
    get: {
      params: {
        slug: type as string[],
      },
    },
  },
  "/path/[[...slug]]": {
    get: {
      params: {
        slug: type as number[],
      },
    },
  },
});

myRoutes["/path/[...slug]"].get({
  params: { slug: ["abc", "def"] },
});
// => "/path/abc/def"


myRoutes["/path/[...slug]"].get();
//                          ^^^^
// Error: Catch-all parameters cannot be omitted when called.

myRoutes["/path/[[...slug]]"].get({
  params: { slug: [123, 456] },
});
// => "/path/123/456"

myRoutes["/path/[[...slug]]"].get();
// => "/path"
// Optional Catch-all parameters can be omitted when called.
```

--------------------------------

### Define Routes with Path Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Use square brackets to define path parameters and type assertions to specify their expected types.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path/[id]": {
    get: {
      params: {
        id: type as number,
        // <number>type is also OK
      },
    },
  },
  "/path/[param1]/[param2]": {
    get: {
      params: {
        param1: type as string,
        param2: type as string | number,
      },
    },
  },
});

myRoutes["/path/[id]"].get({ params: { id: 123 } });
// => "/path/123"

myRoutes["/path/[id]"].get({ params: { id: "abc" } });
//                                         ^^^^^
// Error: Type 'string' is not assignable to type 'number'

myRoutes["/path/[param1]/[param2]"].get({
  params: { param1: "abc", param2: 123 },
});
// => "/path/abc/123"

myRoutes["/path/[id]"].get();
//                     ^^^^
// Error: Path parameters cannot be omitted when called.
```

--------------------------------

### Define and mock routes in TypeScript

Source: https://github.com/ykicchan/routopia/blob/main/CHANGELOG.md

Use the .mock() method to generate URL patterns for mock servers, optionally providing parameters to replace placeholders.

```ts
const myRoutes = routes({
  "/users/[id]": { params: { id: type as string } },
});
myRoutes["/users/[id]"].mock(); // => "/users/*"
myRoutes["/users/[id]"].mock({ params: { id: "123" } }); // => "/users/123"
```

--------------------------------

### Create an API abstraction layer

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Wraps the routopia routes function with a base URL and generic schema support.

```ts
// createMyApiRoutes.ts
import { routes, empty, type, ExpectedSchema } from 'routopia';

const API_BASE_URL = "https://api.example.com";

export function createMyApiRoutes<T extends ExpectedSchema<T>>(schema: T) {
  return routes(API_BASE_URL, schema);
}

export const schema = { empty, type };
```

--------------------------------

### Catch-all Parameter Type Inference

Source: https://github.com/ykicchan/routopia/blob/main/CHANGELOG.md

Demonstrates how catch-all parameters are inferred with and without 'as const' assertions.

```typescript
myRoutes["/params/[...params]"].get({ params: ["1"] })
```

```typescript
myRoutes["/params/[...params]"].get({ params: ["1"] as const })
```

--------------------------------

### Combine route definitions

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Shows how to aggregate multiple route objects, noting that this approach may negatively impact TreeShaking.

```ts
// index.ts
import { userRoutes } from './path/to/userRoutes';
import { postRoutes } from './path/to/postRoutes';

export const apiRoutes = {
  ...userRoutes,
  ...postRoutes,
};

// Usage
import { apiRoutes } from './path/to/index';
apiRoutes["/users"].get();
apiRoutes["/posts/[id]"].get({ params: { id: 123 } });
// You can search all routes uniformly, but the bundle size will increase
```

--------------------------------

### Define Routes Without Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Use the empty constant to define routes that do not require any parameters.

```ts
import { routes, empty } from 'routopia';

const myRoutes = routes({
  "/path": {
    get: empty,
    post: empty,
    put: empty,
    delete: empty,
  },
});

myRoutes["/path"].get();
myRoutes["/path"].post();
myRoutes["/path"].put();
myRoutes["/path"].delete();
// => All resolve to "/path"
```

--------------------------------

### Mocking inherited parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Illustrates how the mock method inherits parameters from endpoint definitions versus specific HTTP method definitions.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path": {
    get: {
      queries: {
        a: type as string,
        b: type as string
      }
    },
    post: {
      queries: {
        b: type as number,
        c: type as number
      }
    }
  }
});

Parameters<(typeof myRoutes)["/path"]["mock"]>
// ^? [{
//   queries?: {
//     a?: string | number | boolean | string[]...;
//     b?: string | number | boolean | string[]...;
//     c?: string | number | boolean | string[]...;
//   }
// }]

Parameters<(typeof myRoutes)["/path"]["get"]["mock"]>
// ^? [{
//   queries?: {
//     a?: string | number | boolean | string[]...;
//     b?: string | number | boolean | string[]...;
//   }
// }]

Parameters<(typeof myRoutes)["/path"]["post"]["mock"]>
// ^? [{
//   queries?: {
//     b?: string | number | boolean | string[]...;
//     c?: string | number | boolean | string[]...;
//   }
// }]
```

--------------------------------

### Define Routes

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Define application routes using the routes function with path parameters and query types.

```ts
import { routes, empty, type } from 'routopia';

export const myRoutes = routes({
  "/users": {
    get: empty,
    post: empty,
  },
  "/path/[id]": {
    get: {
      params: {
        id: type as number,
      },
      queries: {
        q: type as string | undefined,
      },
    },
  },
});
```

--------------------------------

### Define URL Hash

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Use the 'hash' key to define URL fragments. The hash is always omittable.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/path": {
    get: {
      hash: type as "anchor1" | "anchor2",
    },
  },
  "/any": {
    get: {
      hash: type as string,
    },
  },
});

myRoutes["/path"].get({ hash: "anchor1" });
// => "/path#anchor1"

myRoutes["/path"].get({ hash: "unknown" });
//                     ^^^^^
// Error: Type '"unknown"' is not assignable to type '"anchor1" | "anchor2"'.

myRoutes["/any"].get({ hash: "unknown" });
// => "/any#unknown"

myRoutes["/path"].get();
// => "/path"
```

--------------------------------

### Define Query Parameters

Source: https://github.com/ykicchan/routopia/blob/main/README.md

Define required and optional query parameters using the 'queries' object. Including 'undefined' in the type definition makes the parameter optional.

```ts
import { routes, type } from 'routopia';

const myRoutes = routes({
  "/required": {
    get: {
      queries: {
        str: type as string,
        num: type as number,
        bool: type as boolean,
        arr: type as string[],
        opt: type as string | undefined,
      },
    },
  },
  "/optional": {
    get: {
      queries: {
        str: type as string | undefined,
        num: type as number | undefined,
        bool: type as boolean | undefined,
        arr: type as string[] | undefined,
      },
    },
  },
});

myRoutes["/required"].get({
  queries: {
    str: "abc",
    num: 123,
    bool: true,
    arr: ["a", "b", "c"]
  },
});
// => "/required?arr=a&arr=b&arr=c&bool=true&num=123&str=abc"

myRoutes["/required"].get();
//                    ^^^
// Error: Cannot be omitted if there are required query parameters.

myRoutes["/optional"].get();
// => "/optional"
```

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