msw-storybook-addon/build/csf3.mjs

Mock APIs in Storybook using Mock Service Worker.

import { n as defaultSetup } from "./addon-DN-DOgIS.mjs";
//#region src/csf3.ts
/**
* Resolve the legacy `parameters.msw` handler definitions to a flat list of handlers.
*/
function resolveHandlers(parameter) {
	if (Array.isArray(parameter)) return parameter;
	if (parameter.handlers == null) return [];
	return (Array.isArray(parameter.handlers) ? parameter.handlers : Object.values(parameter.handlers)).flat().filter(Boolean);
}
let hasPrintedDeprecationWarning = false;
function printDeprecationWarning() {
	if (!hasPrintedDeprecationWarning) {
		console.warn("[msw-storybook-addon] `mswLoader` is deprecated when using CSF Next — use `addonMsw()` instead. Run `npx msw-storybook-migrate` to migrate.\n\nLearn more: https://github.com/mswjs/msw-storybook-addon/blob/main/MIGRATION.md#from-2xx-to-3xx");
		hasPrintedDeprecationWarning = true;
	}
}
let mswInstancePromise;
/**
* Create a loader to initialize Mock Service Worker. This is the supported
* integration for CSF 3.0 projects.
*
* Deprecated when using CSF Next: use the preview annotations (`addonMsw()`)
* instead. Run `npx msw-storybook-migrate` to migrate automatically. See the
* {@link https://github.com/mswjs/msw-storybook-addon/blob/main/MIGRATION.md#from-2xx-to-3xx migration guide}
* for details.
*
* @example
* // .storybook/preview.ts
* import { mswLoader } from 'msw-storybook-addon/csf3'
*
* export default {
*   loaders: [mswLoader()],
*   parameters: {
*     msw: [...initialHandlers]
*   }
* }
*/
function mswLoader(setup = defaultSetup) {
	return async (context) => {
		if (context.parameters.csfFactory === true) printDeprecationWarning();
		const worker = await (mswInstancePromise ??= Promise.resolve(setup()));
		context.msw = worker;
		worker.resetHandlers();
		const handlers = context.parameters.msw ? resolveHandlers(context.parameters.msw) : [];
		if (handlers.length !== 0) worker.use(...handlers);
		return {};
	};
}
//#endregion
export { mswLoader };