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Mark Skelton
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Mar 26, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -5,5 +5,8 @@ | |
| "env": { | ||
| "jest": true, | ||
| "node": true | ||
| }, | ||
| "rules": { | ||
| "@typescript-eslint/no-non-null-assertion": "off" | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,47 @@ | ||
| export function run(): boolean { | ||
| return true | ||
| import { BackendModule, ReadCallback, Services } from 'i18next' | ||
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|
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| type ResourceFetcher = () => Promise<Record<string, string>> | ||
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| export interface AsyncBackendOptions { | ||
| resources?: { | ||
| [language: string]: ResourceFetcher | Record<string, ResourceFetcher> | ||
| } | ||
| } | ||
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| export default class AsyncBackend | ||
| implements BackendModule<AsyncBackendOptions> { | ||
| // i18next is dumb as TypeScript requires the class property for `type` | ||
| // but the runtime requires the static `type` property. | ||
| static type = 'backend' | ||
| type = 'backend' as const | ||
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| private options: AsyncBackendOptions = null! | ||
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| constructor(services: Services, options: AsyncBackendOptions) { | ||
| this.init(services, options) | ||
| } | ||
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| init(_: Services, options: AsyncBackendOptions): void { | ||
| this.options = { ...this.options, ...options } | ||
| } | ||
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| read(lng: string, ns: string, callback: ReadCallback): void { | ||
| const resourceFetcher = this.getResourceFetcher(lng, ns) | ||
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|
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| if (resourceFetcher) { | ||
| resourceFetcher() | ||
| .then((resource) => callback(null, resource)) | ||
| .catch((err) => callback(err, false)) | ||
| } else { | ||
| callback(new Error('resource not found'), false) | ||
| } | ||
| } | ||
|
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| private getResourceFetcher(lng: string, ns: string) { | ||
| // Languages can specify a function if they only have a single namespace | ||
| // or an object if they have multiple namespaces. | ||
| const fetcher = this.options.resources?.[lng] | ||
|
|
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| return typeof fetcher === 'function' ? fetcher : fetcher?.[ns] | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| import i18next from 'i18next' | ||
| import AsyncBackend, { AsyncBackendOptions } from '../src' | ||
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| async function init(ns: string[], resources: AsyncBackendOptions['resources']) { | ||
| const i18n = i18next.createInstance().use(AsyncBackend) | ||
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| const t = await i18n.init({ | ||
| backend: { resources }, | ||
| fallbackLng: 'en', | ||
| defaultNS: ns[0], | ||
| ns, | ||
| }) | ||
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| return { i18n, t } | ||
| } | ||
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| it('should accept a function if there is only one namespace', async () => { | ||
| const { t } = await init(['translation'], { | ||
| en: () => Promise.resolve({ foo: 'bar' }), | ||
| }) | ||
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| expect(t('foo')).toBe('bar') | ||
| }) | ||
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| it('should accept an object if there are multiple namespaces', async () => { | ||
| const { t } = await init(['ns1', 'ns2'], { | ||
| en: { | ||
| ns1: () => Promise.resolve({ fruit: 'Apples' }), | ||
| ns2: () => Promise.resolve({ fruit: 'Oranges' }), | ||
| }, | ||
| }) | ||
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| expect(t('fruit')).toBe('Apples') | ||
| expect(t('ns1:fruit')).toBe('Apples') | ||
| expect(t('ns2:fruit')).toBe('Oranges') | ||
| }) | ||
|
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| it('should load multiple languages', async () => { | ||
| const { t, i18n } = await init(['ns1', 'ns2'], { | ||
| en: { | ||
| ns1: () => Promise.resolve({ fruit: 'Apples' }), | ||
| ns2: () => Promise.resolve({ fruit: 'Oranges' }), | ||
| }, | ||
| es: { | ||
| ns1: () => Promise.resolve({ fruit: 'Manzanas' }), | ||
| ns2: () => Promise.resolve({ fruit: 'Naranjas' }), | ||
| }, | ||
| }) | ||
|
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| // English | ||
| expect(t('fruit')).toBe('Apples') | ||
| expect(t('ns1:fruit')).toBe('Apples') | ||
| expect(t('ns2:fruit')).toBe('Oranges') | ||
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| // Spanish | ||
| await i18n.changeLanguage('es') | ||
| expect(t('fruit')).toBe('Manzanas') | ||
| expect(t('ns1:fruit')).toBe('Manzanas') | ||
| expect(t('ns2:fruit')).toBe('Naranjas') | ||
| }) |
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