From 55c5973d379eda689fd1bfd4146f330d3661fbff Mon Sep 17 00:00:00 2001
From: Alf Eaton <alf.eaton@overleaf.com>
Date: Mon, 21 Mar 2022 10:26:25 +0000
Subject: [PATCH] Add custom transform for extracting i18next keys from
 TypeScript files (#7138)

GitOrigin-RevId: 3b435b999c72e666eff25f86eb65e0368e953910
---
 services/web/i18next-scanner.config.js | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/services/web/i18next-scanner.config.js b/services/web/i18next-scanner.config.js
index 10e6252230..30394cbf90 100644
--- a/services/web/i18next-scanner.config.js
+++ b/services/web/i18next-scanner.config.js
@@ -1,7 +1,11 @@
+const fs = require('node:fs')
+const path = require('node:path')
+const typescript = require('typescript')
+
 module.exports = {
   input: [
-    'frontend/js/**/*.{js,jsx}',
-    'modules/**/*.{js,jsx}',
+    'frontend/js/**/*.{js,jsx,ts,tsx}',
+    'modules/**/*.{js,jsx,ts,tsx}',
     '!frontend/js/vendor/**',
   ],
   output: './',
@@ -24,4 +28,22 @@ module.exports = {
       lineEnding: '\n',
     },
   },
+  // adapted from https://github.com/nucleartux/i18next-scanner-typescript/blob/master/src/index.js
+  transform: function (file, enc, done) {
+    const { base, ext } = path.parse(file.path)
+
+    if (['.ts', '.tsx'].includes(ext) && !base.endsWith('.d.ts')) {
+      const content = fs.readFileSync(file.path, enc)
+
+      const { outputText } = typescript.transpileModule(content, {
+        compilerOptions: { target: 'es2018', jsx: 'preserve' },
+        fileName: base,
+      })
+
+      this.parser.parseTransFromString(outputText)
+      this.parser.parseFuncFromString(outputText)
+    }
+
+    done()
+  },
 }