woocommerce/packages/js/api-core-tests/utils/api-collection/build-collection.js

const fs = require( 'fs' );
const { Collection, ItemGroup, Item } = require( 'postman-collection' );
require( 'dotenv' ).config();
const { BASE_URL, USER_KEY, USER_SECRET, USE_INDEX_PERMALINKS } = process.env;

/**
 * Build a Postman collection using the API testing objects.
 *
 * For more information on the Postman Collection SDK, see:
 * https://www.postmanlabs.com/postman-collection/index.html
 */

// Set up our empty collection
if ( typeof USER_KEY === 'undefined' ) {
	console.log( 'No USER_KEY was defined.' );
}
if ( typeof USER_SECRET === 'undefined' ) {
	console.log( 'No USER_SECRET was defined.' );
}

const postmanCollection = new Collection( {
	auth: {
		type: 'basic',
		basic: [
			{
				key: 'username',
				value: USER_KEY,
				type: 'string',
			},
			{
				key: 'password',
				value: USER_SECRET,
				type: 'string',
			},
		],
	},
	info: {
		name: 'WooCommerce API - v3',
	},
} );

// Get the API url
if ( typeof BASE_URL === 'undefined' ) {
	console.log( 'No BASE_URL was defined.' );
}

// Update the API path if the `USE_INDEX_PERMALINKS` flag is set
const useIndexPermalinks = USE_INDEX_PERMALINKS === 'true';
let apiPath = `${ BASE_URL }/?rest_route=/wc/v3`;
if ( useIndexPermalinks ) {
	apiPath = `${ BASE_URL }/wp-json/wc/v3`;
}
// Set this here for use in `request.js`
global.API_PATH = `${ apiPath }/`;

// Add the API path has a collection variable
postmanCollection.variables.add( {
	id: 'apiBaseUrl',
	value: apiPath,
	type: 'string',
} );

// Get the API request data
const resources = require( '../../endpoints' );
resourceKeys = Object.keys( resources );

// Add the requests to folders in the collection
for ( const key in resources ) {
	const folder = new ItemGroup( {
		name: resources[ key ].name,
		items: [],
	} );

	for ( const endpoint in resources[ key ] ) {
		const api = resources[ key ][ endpoint ];

		// If there is no name defined, continue
		if ( ! api.name ) {
			continue;
		}

		const request = new Item( {
			name: api.name,
			request: {
				url: `{{apiBaseUrl}}/${ api.path }`,
				method: api.method,
				body: {
					mode: 'raw',
					raw: JSON.stringify( api.payload ),
					options: {
						raw: { language: 'json' },
					},
				},
			},
		} );
		folder.items.add( request );
	}

	postmanCollection.items.add( folder );
}

// We need to convert the collection to JSON so that it can be exported to a file
const collectionJSON = postmanCollection.toJSON();

// Create a colleciton.json file. It can be imported to postman
fs.writeFile(
	'./collection.json',
	JSON.stringify( collectionJSON ),
	( err ) => {
		if ( err ) {
			console.log( err );
		}
		console.log( 'File saved!' );
	}
);