deno.land / x / jotai@v1.8.4 / src / urql / atomWithSubscription.ts

atomWithSubscription.ts
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import type { AnyVariables, Client, OperationContext, OperationResult, TypedDocumentNode,} from '@urql/core'import { pipe, subscribe } from 'wonka'import type { Subscription } from 'wonka'import { atom } from 'jotai'import type { Getter, WritableAtom } from 'jotai'import { clientAtom } from './clientAtom'
type Timeout = ReturnType<typeof setTimeout>
type AtomWithSubscriptionAction = { type: 'refetch'}
type OperationResultWithData<Data, Variables extends AnyVariables> = Omit< OperationResult<Data, Variables>, 'data'> & { data: Data }
const isOperationResultWithData = <Data, Variables extends AnyVariables>( result: OperationResult<Data, Variables>): result is OperationResultWithData<Data, Variables> => 'data' in result && !result.error
type SubscriptionArgs<Data, Variables extends AnyVariables> = { query: TypedDocumentNode<Data, Variables> | string variables: Variables context?: Partial<OperationContext>}
type SubscriptionArgsWithPause< Data, Variables extends AnyVariables> = SubscriptionArgs<Data, Variables> & { pause: boolean}
export function atomWithSubscription<Data, Variables extends AnyVariables>( createSubscriptionArgs: (get: Getter) => SubscriptionArgs<Data, Variables>, getClient?: (get: Getter) => Client): WritableAtom< OperationResultWithData<Data, Variables>, AtomWithSubscriptionAction>
export function atomWithSubscription<Data, Variables extends AnyVariables>( createSubscriptionArgs: ( get: Getter ) => SubscriptionArgsWithPause<Data, Variables>, getClient?: (get: Getter) => Client): WritableAtom< OperationResultWithData<Data, Variables> | null, AtomWithSubscriptionAction>
export function atomWithSubscription<Data, Variables extends AnyVariables>( createSubscriptionArgs: (get: Getter) => SubscriptionArgs<Data, Variables>, getClient: (get: Getter) => Client = (get) => get(clientAtom)) { type Result = OperationResult<Data, Variables> const queryResultAtom = atom((get) => { const args = createSubscriptionArgs(get) if ((args as { pause?: boolean }).pause) { return null } const client = getClient(get) let resolve: ((result: Result) => void) | null = null const makePending = () => new Promise<Result>((r) => { resolve = r }) const resultAtom = atom<Result | Promise<Result>>(makePending()) let setResult: ((result: Result) => void) | null = null const listener = (result: Result) => { // FIXME having this check make a error recovery test to fail // if (!resolve && !setResult) { // throw new Error('setting result without mount') // } if (resolve) { resolve(result) resolve = null } if (setResult) { setResult(result) } } let subscription: Subscription | null = null let timer: Timeout | undefined const startSub = () => { if (subscription) { clearTimeout(timer) subscription.unsubscribe() } subscription = pipe( client.subscription(args.query, args.variables, args.context), subscribe(listener) ) if (!setResult) { // not mounted yet timer = setTimeout(() => { if (subscription) { subscription.unsubscribe() subscription = null } }, 1000) } } startSub() resultAtom.onMount = (update) => { setResult = update if (subscription) { clearTimeout(timer as Timeout) } else { startSub() } return () => { setResult = null if (subscription) { subscription.unsubscribe() subscription = null } } } return { resultAtom, makePending, startSub } }) const queryAtom = atom( (get) => { const queryResult = get(queryResultAtom) if (!queryResult) { return null } const { resultAtom } = queryResult const result = get(resultAtom) if (!isOperationResultWithData(result)) { throw result.error } return result }, (get, set, action: AtomWithSubscriptionAction) => { switch (action.type) { case 'refetch': { const queryResult = get(queryResultAtom) if (!queryResult) { throw new Error('query is paused') } const { resultAtom, makePending, startSub } = queryResult set(resultAtom, makePending()) startSub() return } } } ) return queryAtom}
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2 years ago