feat(settings): replaces dynamic import with getting a ready static module loader

package.json

@@ -19,6 +19,7 @@
     "test:watch": "jest --watchAll",
     "typecheck": "tsc --noEmit",
     "prepublishOnly": "npm run lint && npm run test && npm run build",
+    "updateLocales": "node scripts/updateLocales.js",
     "prepare": "husky install"
   },
   "files": [

scripts/updateLocales.js

@@ -0,0 +1,75 @@
+/**
+ * Fetches and writes to the locale file from github dayjs
+ * node.js >= 20 lts
+ * @module Locale
+ * */
+
+const fs = require('node:fs');
+const fsPromises = require('node:fs/promises');
+
+const VALID_FILE_PATTERN = /^((?!index).)*.js$/;
+const LOCALES_PATH = 'src/settings/locales.ts';
+const LOCALES_DIR_PATH = 'node_modules/dayjs/locale';
+
+const getLocalesList = async (localesDirPath) => {
+    if (fs.existsSync(localesDirPath)) {
+        const localesList = await fsPromises.readdir(localesDirPath);
+        return localesList.filter((locale) => VALID_FILE_PATTERN.test(locale));
+    }
+
+    throw new Error(
+        'The script was called before the dayjs library was installed, install it and try again',
+    );
+};
+
+const createLocalesFile = async (localesPath) => {
+    if (fs.existsSync(localesPath)) {
+        await fsPromises.rm(localesPath);
+    }
+
+    return await fsPromises.open(localesPath, 'w');
+};
+
+const buildLocalesContent = (localesList) => {
+    const isEmptyStr = (s) => !s.length || !s;
+
+    const localeChunks = [];
+
+    localeChunks.push("type LocaleLoader = () => Promise<typeof import('dayjs/locale/*.js')>;\n");
+    localeChunks.push('export const localeLoaders: Record<string, LocaleLoader> = {');
+
+    localesList.forEach((locale) => {
+        if (isEmptyStr(locale)) return;
+
+        const name = locale.substring(0, locale.lastIndexOf('.'));
+        const localeName = name.includes('-') ? `'${name}'` : name;
+
+        localeChunks.push(`    ${localeName}: () => import('dayjs/locale/${locale}'),`);
+    });
+
+    localeChunks.push('};\n');
+
+    return localeChunks.join('\n');
+};
+
+(async function () {
+    try {
+        const localesList = await getLocalesList(LOCALES_DIR_PATH);
+
+        console.info('Locales loaded successfully');
+
+        const localeFile = await createLocalesFile(LOCALES_PATH);
+
+        console.info(`File "${LOCALES_PATH}" created successfully`);
+
+        const localesContent = buildLocalesContent(localesList);
+
+        console.info(`File content built successfully`);
+
+        await localeFile.appendFile(localesContent);
+
+        console.info(`Object "localeLoaders" written in file "${LOCALES_PATH}" successfully`);
+    } catch (error) {
+        console.error(error);
+    }
+})();

src/settings/locales.ts

@@ -0,0 +1,147 @@
+type LocaleLoader = () => Promise<typeof import('dayjs/locale/*.js')>;
+
+export const localeLoaders: Record<string, LocaleLoader> = {
+    af: () => import('dayjs/locale/af.js'),
+    am: () => import('dayjs/locale/am.js'),
+    'ar-dz': () => import('dayjs/locale/ar-dz.js'),
+    'ar-iq': () => import('dayjs/locale/ar-iq.js'),
+    'ar-kw': () => import('dayjs/locale/ar-kw.js'),
+    'ar-ly': () => import('dayjs/locale/ar-ly.js'),
+    'ar-ma': () => import('dayjs/locale/ar-ma.js'),
+    'ar-sa': () => import('dayjs/locale/ar-sa.js'),
+    'ar-tn': () => import('dayjs/locale/ar-tn.js'),
+    ar: () => import('dayjs/locale/ar.js'),
+    az: () => import('dayjs/locale/az.js'),
+    be: () => import('dayjs/locale/be.js'),
+    bg: () => import('dayjs/locale/bg.js'),
+    bi: () => import('dayjs/locale/bi.js'),
+    bm: () => import('dayjs/locale/bm.js'),
+    'bn-bd': () => import('dayjs/locale/bn-bd.js'),
+    bn: () => import('dayjs/locale/bn.js'),
+    bo: () => import('dayjs/locale/bo.js'),
+    br: () => import('dayjs/locale/br.js'),
+    bs: () => import('dayjs/locale/bs.js'),
+    ca: () => import('dayjs/locale/ca.js'),
+    cs: () => import('dayjs/locale/cs.js'),
+    cv: () => import('dayjs/locale/cv.js'),
+    cy: () => import('dayjs/locale/cy.js'),
+    da: () => import('dayjs/locale/da.js'),
+    'de-at': () => import('dayjs/locale/de-at.js'),
+    'de-ch': () => import('dayjs/locale/de-ch.js'),
+    de: () => import('dayjs/locale/de.js'),
+    dv: () => import('dayjs/locale/dv.js'),
+    el: () => import('dayjs/locale/el.js'),
+    'en-au': () => import('dayjs/locale/en-au.js'),
+    'en-ca': () => import('dayjs/locale/en-ca.js'),
+    'en-gb': () => import('dayjs/locale/en-gb.js'),
+    'en-ie': () => import('dayjs/locale/en-ie.js'),
+    'en-il': () => import('dayjs/locale/en-il.js'),
+    'en-in': () => import('dayjs/locale/en-in.js'),
+    'en-nz': () => import('dayjs/locale/en-nz.js'),
+    'en-sg': () => import('dayjs/locale/en-sg.js'),
+    'en-tt': () => import('dayjs/locale/en-tt.js'),
+    en: () => import('dayjs/locale/en.js'),
+    eo: () => import('dayjs/locale/eo.js'),
+    'es-do': () => import('dayjs/locale/es-do.js'),
+    'es-mx': () => import('dayjs/locale/es-mx.js'),
+    'es-pr': () => import('dayjs/locale/es-pr.js'),
+    'es-us': () => import('dayjs/locale/es-us.js'),
+    es: () => import('dayjs/locale/es.js'),
+    et: () => import('dayjs/locale/et.js'),
+    eu: () => import('dayjs/locale/eu.js'),
+    fa: () => import('dayjs/locale/fa.js'),
+    fi: () => import('dayjs/locale/fi.js'),
+    fo: () => import('dayjs/locale/fo.js'),
+    'fr-ca': () => import('dayjs/locale/fr-ca.js'),
+    'fr-ch': () => import('dayjs/locale/fr-ch.js'),
+    fr: () => import('dayjs/locale/fr.js'),
+    fy: () => import('dayjs/locale/fy.js'),
+    ga: () => import('dayjs/locale/ga.js'),
+    gd: () => import('dayjs/locale/gd.js'),
+    gl: () => import('dayjs/locale/gl.js'),
+    'gom-latn': () => import('dayjs/locale/gom-latn.js'),
+    gu: () => import('dayjs/locale/gu.js'),
+    he: () => import('dayjs/locale/he.js'),
+    hi: () => import('dayjs/locale/hi.js'),
+    hr: () => import('dayjs/locale/hr.js'),
+    ht: () => import('dayjs/locale/ht.js'),
+    hu: () => import('dayjs/locale/hu.js'),
+    'hy-am': () => import('dayjs/locale/hy-am.js'),
+    id: () => import('dayjs/locale/id.js'),
+    is: () => import('dayjs/locale/is.js'),
+    'it-ch': () => import('dayjs/locale/it-ch.js'),
+    it: () => import('dayjs/locale/it.js'),
+    ja: () => import('dayjs/locale/ja.js'),
+    jv: () => import('dayjs/locale/jv.js'),
+    ka: () => import('dayjs/locale/ka.js'),
+    kk: () => import('dayjs/locale/kk.js'),
+    km: () => import('dayjs/locale/km.js'),
+    kn: () => import('dayjs/locale/kn.js'),
+    ko: () => import('dayjs/locale/ko.js'),
+    ku: () => import('dayjs/locale/ku.js'),
+    ky: () => import('dayjs/locale/ky.js'),
+    lb: () => import('dayjs/locale/lb.js'),
+    lo: () => import('dayjs/locale/lo.js'),
+    lt: () => import('dayjs/locale/lt.js'),
+    lv: () => import('dayjs/locale/lv.js'),
+    me: () => import('dayjs/locale/me.js'),
+    mi: () => import('dayjs/locale/mi.js'),
+    mk: () => import('dayjs/locale/mk.js'),
+    ml: () => import('dayjs/locale/ml.js'),
+    mn: () => import('dayjs/locale/mn.js'),
+    mr: () => import('dayjs/locale/mr.js'),
+    'ms-my': () => import('dayjs/locale/ms-my.js'),
+    ms: () => import('dayjs/locale/ms.js'),
+    mt: () => import('dayjs/locale/mt.js'),
+    my: () => import('dayjs/locale/my.js'),
+    nb: () => import('dayjs/locale/nb.js'),
+    ne: () => import('dayjs/locale/ne.js'),
+    'nl-be': () => import('dayjs/locale/nl-be.js'),
+    nl: () => import('dayjs/locale/nl.js'),
+    nn: () => import('dayjs/locale/nn.js'),
+    'oc-lnc': () => import('dayjs/locale/oc-lnc.js'),
+    'pa-in': () => import('dayjs/locale/pa-in.js'),
+    pl: () => import('dayjs/locale/pl.js'),
+    'pt-br': () => import('dayjs/locale/pt-br.js'),
+    pt: () => import('dayjs/locale/pt.js'),
+    rn: () => import('dayjs/locale/rn.js'),
+    ro: () => import('dayjs/locale/ro.js'),
+    ru: () => import('dayjs/locale/ru.js'),
+    rw: () => import('dayjs/locale/rw.js'),
+    sd: () => import('dayjs/locale/sd.js'),
+    se: () => import('dayjs/locale/se.js'),
+    si: () => import('dayjs/locale/si.js'),
+    sk: () => import('dayjs/locale/sk.js'),
+    sl: () => import('dayjs/locale/sl.js'),
+    sq: () => import('dayjs/locale/sq.js'),
+    'sr-cyrl': () => import('dayjs/locale/sr-cyrl.js'),
+    sr: () => import('dayjs/locale/sr.js'),
+    ss: () => import('dayjs/locale/ss.js'),
+    'sv-fi': () => import('dayjs/locale/sv-fi.js'),
+    sv: () => import('dayjs/locale/sv.js'),
+    sw: () => import('dayjs/locale/sw.js'),
+    ta: () => import('dayjs/locale/ta.js'),
+    te: () => import('dayjs/locale/te.js'),
+    tet: () => import('dayjs/locale/tet.js'),
+    tg: () => import('dayjs/locale/tg.js'),
+    th: () => import('dayjs/locale/th.js'),
+    tk: () => import('dayjs/locale/tk.js'),
+    'tl-ph': () => import('dayjs/locale/tl-ph.js'),
+    tlh: () => import('dayjs/locale/tlh.js'),
+    tr: () => import('dayjs/locale/tr.js'),
+    tzl: () => import('dayjs/locale/tzl.js'),
+    'tzm-latn': () => import('dayjs/locale/tzm-latn.js'),
+    tzm: () => import('dayjs/locale/tzm.js'),
+    'ug-cn': () => import('dayjs/locale/ug-cn.js'),
+    uk: () => import('dayjs/locale/uk.js'),
+    ur: () => import('dayjs/locale/ur.js'),
+    'uz-latn': () => import('dayjs/locale/uz-latn.js'),
+    uz: () => import('dayjs/locale/uz.js'),
+    vi: () => import('dayjs/locale/vi.js'),
+    'x-pseudo': () => import('dayjs/locale/x-pseudo.js'),
+    yo: () => import('dayjs/locale/yo.js'),
+    'zh-cn': () => import('dayjs/locale/zh-cn.js'),
+    'zh-hk': () => import('dayjs/locale/zh-hk.js'),
+    'zh-tw': () => import('dayjs/locale/zh-tw.js'),
+    zh: () => import('dayjs/locale/zh.js'),
+};

src/settings/settings.ts

@@ -3,6 +3,7 @@ import cloneDeep from 'lodash/cloneDeep';
 import dayjs from '../dayjs';
 import {normalizeTimeZone} from '../timeZone';
 
+import {localeLoaders} from './locales';
 import type {UpdateLocaleConfig} from './types';
 
 class Settings {
@@ -22,8 +23,8 @@ class Settings {
         if (!this.isLocaleLoaded(locale)) {
             try {
                 const localeInLowerCase = locale.toLocaleLowerCase();
-                // https://github.com/iamkun/dayjs/issues/792#issuecomment-639961997
-                await import(`dayjs/locale/${localeInLowerCase}.js`);
+                const localeLoader = localeLoaders[localeInLowerCase];
+                await localeLoader();
                 this.loadedLocales.add(localeInLowerCase);
             } catch (error) {
                 throw new Error(