parse-openapi

The OpenAPi v3 parser extracted from openapi-typescript-codegen. So first of all, all credits go to Ferdi Koomen for his work on this great library. Only the parser is needed to render the models, services and hooks with custom templates, hence this stripped down version.

Installation

npm install -D parse-openapi openapi-types

API

import { readFile, writeFile } from 'fs/promises';
import { parse } from 'parse-openapi';
import { renderModel, renderService } from './templates';
import type { OpenAPIV3 } from 'openapi-types';

const specs: OpenAPIV3 = JSON.parse(await readFile('swagger.json', 'utf8'));

const { version, server, models, services } = parse(specs);

models.forEach(model => writeFile(`${model.name}.ts`, renderModel(model)));
services.forEach(service =>
  writeFile(`${service.name}.ts`, renderService(service))
);

Example render function

This could be anything from Handlebars templates to template literals. Here's a minimal example:

import type { Operation, Service } from 'parse-openapi';

const renderOperation = (operation: Operation): string => {
  const [result] = operation.results;
  return `
/**
 * ${operation.summary}
 * ${operation.description}
 * @returns ${result.type} ${result.description}
 ${operation.deprecated ? '* @deprecated' : ''}
 */
export function ${operation.name}([...]): Promise<${result.type}> {
  return request({
    method: '${operation.method}',
    path: \`${operation.path}\`,
    [...]
  });
}`;
};

export default (service: Service) => {
  return services.operations.map(renderOperation).join(';');
};