openapi-helpers

This package contains scripts, types and functions to help you work with openapi.

Installation

Run the following commands:

npm install --save-dev @map-colonies/openapi-helpers supertest prettier openapi-typescript @types/express

types-generator

The package contains a script that wraps the openapi-typescript package and generates types for the openapi schema. The script also formats the generated types using prettier.

The command structure is as follows:

npx @map-colonies/openapi-helpers <input-file> <output-file> --format --add-typed-request-handler

For example:

npx @map-colonies/openapi-helpers ./openapi3.yaml ./src/openapi.d.ts --format --add-typed-request-handler

options

• --format - format the generated types using prettier.
• --add-typed-request-handler - add the TypedRequestHandler type to the generated types.

TypedRequestHandler

The package contains a wrapper for the express types package that provides autocomplete for all the request Handlers to the API based on the openapi. The TypedRequestHandler is initialized with the the typed generated by openapi-typescript, and is configured based on operation name or method and path.

Usage

import { TypedRequestHandlers } from '@map-colonies/openapi-helpers/typedRequestHandler';
import type { paths, operations } from './src/openapi.d.ts';

// Initialize the TypedRequestHandlers with the paths and operations types
// This can be done in a separate file and exported, in the same file or even in the same line
type MyHandlers = TypedRequestHandlers<paths, operations>;

export class Controller {
  // Define the handler for the operation based method and path
  public getResource: MyHandlers['GET /resource'] = (req, res) => {
    res.status(httpStatus.OK).json({id: 1, description: 'description', name: 'name'});
  };


  // Define the handler for the operation based on the operation name
  public getResource: MyHandlers['getResource'] = (req, res) => {
    res.status(httpStatus.OK).json({id: 1, description: 'description', name: 'name'});
  };
}

RequestSender

The package contains a wrapper for the supertest package that provides autocomplete for all the requests to the API based on the openapi. The requestSender is initialized with the server's base url and the openapi schema and the types exported by openapi-typescript.

import { RequestSender } from '@map-colonies/openapi-helpers/requestSender';
import type { paths, operations } from './src/openapi.d.ts';

const requestSender = await createRequestSender<paths, operations>('path/to/openapi3.yaml', expressApp);

The requestSender object contains all the paths and operations defined in the openapi schema. For example, to send a request to the getUsers operation with the /users path and with the GET method, you can use the following code:

const response = await requestSender.getUsers();

// or

const response = await requestSender.sendRequest({ 
  method: 'get', 
  path: '/simple-request'
});

The package supports all the operations defined in the openapi schema, either by operation name, or by using the sendRequest function with the method, path and parameters.

[!IMPORTANT] For the package function properly, you need to make sure that the following values are configured in your tsconfig.json or jsconfig.json files under compilerOptions:

• module: "NodeNext"
• moduleResolution: "NodeNext"