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345ddb1f72
Extract translation keys with i18next-scanner GitOrigin-RevId: 5ba1b1e48c188290a0a462e830bc60b3d5b62c3d
65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
/*
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* Custom webpack loader for i18next locale JSON files.
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*
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* It extracts translations used in the frontend (based on the list of keys in
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* extracted-locales.json), and merges them with the fallback language (English)
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*
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* This means that we only load minimal translations data used in the frontend.
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*/
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const fs = require('fs').promises
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const Path = require('path')
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const SOURCE_PATH = Path.join(__dirname, '../locales')
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const EXTRACTED_TRANSLATIONS_PATH = Path.join(
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__dirname,
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'extracted-translations.json'
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)
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module.exports = function translationsLoader() {
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// Mark the loader as asynchronous, and get the done callback function
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const callback = this.async()
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// Mark the extracted keys file and English translations as a "dependency", so
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// that it gets watched for changes in dev
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this.addDependency(EXTRACTED_TRANSLATIONS_PATH)
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this.addDependency(`${SOURCE_PATH}/en.json`)
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const [, locale] = this.resourcePath.match(/(\w{2}(-\w{2})?)\.json$/)
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run(locale)
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.then(translations => {
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callback(null, JSON.stringify(translations))
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})
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.catch(err => callback(err))
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}
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async function run(locale) {
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const json = await fs.readFile(EXTRACTED_TRANSLATIONS_PATH)
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const keys = Object.keys(JSON.parse(json))
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const fallbackTranslations = await extract('en', keys)
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return extract(locale, keys, fallbackTranslations)
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}
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async function extract(locale, keys, fallbackTranslations = null) {
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const allTranslations = await getAllTranslations(locale)
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const extractedTranslations = extractByKeys(keys, allTranslations)
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return Object.assign({}, fallbackTranslations, extractedTranslations)
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}
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async function getAllTranslations(locale) {
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const content = await fs.readFile(Path.join(SOURCE_PATH, `${locale}.json`))
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return JSON.parse(content)
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}
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function extractByKeys(keys, translations) {
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return keys.reduce((acc, key) => {
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const foundString = translations[key]
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if (foundString) {
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acc[key] = foundString
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}
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return acc
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}, {})
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}
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