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import type { Preview } from '@storybook/react'
import DefaultDecorator from '../web/src/app/storybook/decorators'
import { initialize, mswLoader } from 'msw-storybook-addon'
import { defaultConfig } from '../web/src/app/storybook/graphql'
import { graphql, HttpResponse } from 'msw'
initialize({
onUnhandledRequest: 'bypass',
})
export type GraphQLRequestHandler = (variables: unknown) => object
export type GraphQLParams = Record<string, GraphQLRequestHandler>
const componentConfig: Record<string, GraphQLParams> = {}
export const mswHandler = graphql.operation((params) => {
const url = new URL(params.request.url)
const gql = componentConfig[url.pathname]
const handler = gql[params.operationName]
if (!handler) {
return HttpResponse.json({
errors: [
{ message: `No mock defined for operation '${params.operationName}'.` },
],
})
}
if (typeof handler === 'function') {
return HttpResponse.json(handler(params.variables))
}
return HttpResponse.json(handler)
})
interface LoaderArg {
id: string
parameters: {
graphql?: GraphQLParams
}
}
/**
* graphqlLoader is a loader function that sets up the GraphQL mocks for the
* component. It stores them in a global object, componentConfig, which is used
* by the mswHandler to resolve the mocks.
*
* We need to do this because the browser will render all components at once,
* and so we need to handle all GraphQL mocks at once.
*
* The way this works is that each component get's a unique URL for GraphQL
* (see decorators.tsx). This URL is used to store the GraphQL mocks for that
* component in componentConfig.
*/
export function graphQLLoader(arg: LoaderArg): void {
const path = '/' + encodeURIComponent(arg.id) + '/api/graphql'
componentConfig[path] = arg.parameters.graphql || {}
}
const preview: Preview = {
parameters: {
controls: {
matchers: {
color: /(background|color)$/i,
date: /Date$/i,
},
},
graphql: {
// default GraphQL handlers
RequireConfig: { data: defaultConfig },
useExpFlag: { data: { experimentalFlags: [] } },
},
msw: { handlers: [mswHandler] },
},
decorators: [DefaultDecorator],
loaders: [graphQLLoader, mswLoader],
}
export default preview
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