1 files changed, 13 insertions, 18 deletions

diff --git a/ext/js/language/ja/japanese-text-preprocessors.js b/ext/js/language/ja/japanese-text-preprocessors.js
index ab4138c3..06f944c1 100644
--- a/ext/js/language/ja/japanese-text-preprocessors.js
+++ b/ext/js/language/ja/japanese-text-preprocessors.js
@@ -30,7 +30,6 @@ export const convertHalfWidthCharacters = {
     name: 'Convert half width characters to full width',
     description: 'ﾖﾐﾁｬﾝ → ヨミチャン',
     options: basicTextPreprocessorOptions,
-    /** @type {import('language').TextPreprocessorFunction<boolean>} */
     process: (str, setting, sourceMap) => (setting ? convertHalfWidthKanaToFullWidth(str, sourceMap) : str)
 };
 
@@ -39,7 +38,6 @@ export const convertNumericCharacters = {
     name: 'Convert numeric characters to full width',
     description: '1234 → １２３４',
     options: basicTextPreprocessorOptions,
-    /** @type {import('language').TextPreprocessorFunction<boolean>} */
     process: (str, setting) => (setting ? convertNumericToFullWidth(str) : str)
 };
 
@@ -48,26 +46,24 @@ export const convertAlphabeticCharacters = {
     name: 'Convert alphabetic characters to hiragana',
     description: 'yomichan → よみちゃん',
     options: basicTextPreprocessorOptions,
-    /** @type {import('language').TextPreprocessorFunction<boolean>} */
     process: (str, setting, sourceMap) => (setting ? convertAlphabeticToKana(str, sourceMap) : str)
 };
 
-/** @type {import('language').TextPreprocessor<boolean>} */
+/** @type {import('language').BidirectionalConversionPreprocessor} */
 export const convertHiraganaToKatakana = {
     name: 'Convert hiragana to katakana',
-    description: 'よみちゃん → ヨミチャン',
-    options: basicTextPreprocessorOptions,
-    /** @type {import('language').TextPreprocessorFunction<boolean>} */
-    process: (str, setting) => (setting ? convertHiraganaToKatakanaFunction(str) : str)
-};
-
-/** @type {import('language').TextPreprocessor<boolean>} */
-export const convertKatakanaToHiragana = {
-    name: 'Convert katakana to hiragana',
-    description: 'ヨミチャン → よみちゃん',
-    options: basicTextPreprocessorOptions,
-    /** @type {import('language').TextPreprocessorFunction<boolean>} */
-    process: (str, setting) => (setting ? convertKatakanaToHiraganaFunction(str) : str)
+    description: 'よみちゃん → ヨミチャン and vice versa',
+    options: ['off', 'direct', 'inverse'],
+    process: (str, setting) => {
+        switch (setting) {
+            case 'off':
+                return str;
+            case 'direct':
+                return convertHiraganaToKatakanaFunction(str);
+            case 'inverse':
+                return convertKatakanaToHiraganaFunction(str);
+        }
+    }
 };
 
 /** @type {import('language').TextPreprocessor<[collapseEmphatic: boolean, collapseEmphaticFull: boolean]>} */
@@ -75,7 +71,6 @@ export const collapseEmphaticSequences = {
     name: 'Collapse emphatic character sequences',
     description: 'すっっごーーい → すっごーい / すごい',
     options: [[false, false], [true, false], [true, true]],
-    /** @type {import('language').TextPreprocessorFunction<[collapseEmphatic: boolean, collapseEmphaticFull: boolean]>} */
     process: (str, setting, sourceMap) => {
         const [collapseEmphatic, collapseEmphaticFull] = setting;
         if (collapseEmphatic) {