64 lines
2.1 KiB
TypeScript
64 lines
2.1 KiB
TypeScript
import {useContext} from 'react'
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import { DataManagerContext } from 'next-server/dist/lib/data-manager-context'
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import { RouterContext } from 'next-server/dist/lib/router-context'
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import fetch from 'unfetch'
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import {stringify} from 'querystring'
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type Args = string|number|Array<string|number>
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function generateArgsKey(args: Args[]) {
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return args.reduce((a: string, b: Args): string => {
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if (Array.isArray(b)) {
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return a + generateArgsKey(b)
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}
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if (typeof b !== 'string' && typeof b !== 'number') {
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throw new Error('arguments can only be string or number')
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}
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return a + b.toString()
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}, '')
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}
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export function createHook(fetcher: (...args: Args[]) => Promise<any>, options: {key: string}) {
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if (!options.key) {
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throw new Error('key not provided to createHook options.')
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}
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return function useData(...args: Array<string|number>) {
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const router: import('next-server/lib/router/router').default = useContext(RouterContext)
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const dataManager: import('next-server/lib/data-manager').DataManager = useContext(DataManagerContext)
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const key = `${options.key}${generateArgsKey(args)}`
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const existing = dataManager.get(key)
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if (existing) {
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if (existing.status === 'resolved') {
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return existing.result
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}
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if (existing === 'mismatched-key') {
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throw new Error('matching key was missing from returned data. make sure arguments match between the client and server')
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}
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}
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// @ts-ignore webpack optimization
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if (process.browser) {
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const res = fetch(router.route + '?' + stringify(router.query), {
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headers: {
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accept: 'application/amp.bind+json',
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},
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}).then((res: any) => res.json()).then((result: any) => {
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const hasKey = result.some((pair: [string, any]) => pair[0] === key)
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if (!hasKey) {
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result = [[key, 'mismatched-key']]
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}
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dataManager.overwrite(result)
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})
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throw res
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} else {
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const res = fetcher(...args).then((result) => {
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dataManager.set(key, {
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status: 'resolved',
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result,
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})
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})
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throw res
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}
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}
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}
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