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diff --git a/ext/js/language/multi-language-transformer.js b/ext/js/language/multi-language-transformer.js
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+++ b/ext/js/language/multi-language-transformer.js
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+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {LanguageTransformer} from './language-transformer.js';
+
+export class MultiLanguageTransformer {
+    constructor() {
+        /** @type {Map<string, LanguageTransformer>} */
+        this._languageTransformers = new Map();
+    }
+
+    /**
+     * @param {import('language-transformer').LanguageTransformDescriptor[]} languageTransformDescriptors
+     */
+    prepare(languageTransformDescriptors) {
+        for (const descriptor of languageTransformDescriptors) {
+            const languageTransformer = new LanguageTransformer();
+            languageTransformer.addDescriptor(descriptor);
+            this._languageTransformers.set(descriptor.language, languageTransformer);
+        }
+    }
+
+    /**
+     * @param {string} language
+     * @param {string[]} partsOfSpeech
+     * @returns {number}
+     */
+    getConditionFlagsFromPartsOfSpeech(language, partsOfSpeech) {
+        const languageTransformer = this._languageTransformers.get(language);
+        return typeof languageTransformer !== 'undefined' ? languageTransformer.getConditionFlagsFromPartsOfSpeech(partsOfSpeech) : 0;
+    }
+
+    /**
+     * @param {string} language
+     * @param {string[]} conditionTypes
+     * @returns {number}
+     */
+    getConditionFlagsFromConditionTypes(language, conditionTypes) {
+        const languageTransformer = this._languageTransformers.get(language);
+        return typeof languageTransformer !== 'undefined' ? languageTransformer.getConditionFlagsFromConditionTypes(conditionTypes) : 0;
+    }
+
+    /**
+     * @param {string} language
+     * @param {string} conditionType
+     * @returns {number}
+     */
+    getConditionFlagsFromConditionType(language, conditionType) {
+        const languageTransformer = this._languageTransformers.get(language);
+        return typeof languageTransformer !== 'undefined' ? languageTransformer.getConditionFlagsFromConditionType(conditionType) : 0;
+    }
+
+    /**
+     * @param {string} language
+     * @param {string} sourceText
+     * @returns {import('language-transformer-internal').TransformedText[]}
+     */
+    transform(language, sourceText) {
+        const languageTransformer = this._languageTransformers.get(language);
+        if (typeof languageTransformer === 'undefined') { return [LanguageTransformer.createTransformedText(sourceText, 0, [])]; }
+        return languageTransformer.transform(sourceText);
+    }
+}