Move i18next-parser config to a separate file (#451)

In their infinite wisdom, the i18next-parser team decided to go ESM-
only, which obviously doesn't work with a TS gulpfile that is still
emulating ESM on top of CommonJS. Sigh.

frontend/gulpfile.ts

@@ -30,8 +30,6 @@ import { argv } from 'yargs';
 import { JSDOM, VirtualConsole } from 'jsdom';
 import * as through2 from 'through2';
 import chalk from 'chalk';
-import { gulp as i18nextParser } from 'i18next-parser';
-import HbsI18nLexer from 'handlebars-i18next-parser';
 
 
 type LibraryProps = {
@@ -96,7 +94,6 @@ const sourceDir = `src`,
     hbsGlobal = 'Handlebars',
     i18nModuleTail = 'dist/umd/i18next',
     i18nModule = `i18next/${i18nModuleTail}`,
-    i18nDir = `${sourceDir}/i18n`,
     styleDir = `${sourceDir}/style`,
     mainStylesheet = `${styleDir}/main.sass`,
     styleSourceGlob = `${styleDir}/*.sass`,
@@ -291,18 +288,6 @@ function reportBundleError(errorObj) {
     log.error(chalk.red(errorObj.message));
 }
 
-export function i18nParse() {
-    return src(`${sourceDir}/**`)
-        .pipe(new i18nextParser({
-            locales: ['en', 'fr'],
-            output: `${i18nDir}/$LOCALE/$NAMESPACE.json`,
-            lexers: {
-                hbs: [HbsI18nLexer],
-            },
-        }))
-        .pipe(dest('.'));
-}
-
 function jsBundle() {
     return tsModules().bundle()
         .on('error', reportBundleError)
@@ -504,8 +489,6 @@ export const watch = series(fullStatic, function watch(done) {
         retest(reloadPr(specRunner.render))
     );
 
-    // i18nParse();
-
     exitController.once('signal', () => {
         [
             tsModules(), tsTestModules(), reporterModules(), styleWatch,

frontend/i18next-parser.config.mjs

@@ -0,0 +1,13 @@
+import HbsI18nLexer from 'handlebars-i18next-parser';
+
+const sourceDir = 'src';
+const i18nDir = `${sourceDir}/i18n`;
+
+export default {
+    input: [`${sourceDir}/**/*.{t,hb}s`, `!${sourceDir}/**/*-te{mplate,st}.ts`],
+    output: `${i18nDir}/$LOCALE/$NAMESPACE.json`,
+    locales: ['en', 'fr'],
+    lexers: {
+        hbs: [HbsI18nLexer],
+    },
+};

package.json

@@ -30,6 +30,7 @@
     "watch-front": "yarn gulp watch --port 8000 --config ../config.json",
     "watch-front-notest": "yarn gulp watchNoTest --port 8000 --config ../config.json",
     "start": "yarn watch-front & yarn serve-back & yarn watch-back",
+    "localize": "yarn front yarn i18next -c i18next-parser.config.mjs",
     "dist": "yarn gulp dist",
     "dist-p": "yarn dist --production --config ../config.json",
     "collectstatic-p": "yarn django collectstatic -v 0 --settings production --pythonpath ..",