3 files changed, 54 insertions, 2 deletions
diff --git a/packages/gitbook-core/src/models/File.js b/packages/gitbook-core/src/models/File.js
index 74db11e..c5ac654 100644
--- a/packages/gitbook-core/src/models/File.js
+++ b/packages/gitbook-core/src/models/File.js
@@ -35,7 +35,7 @@ class File extends Record(DEFAULTS) {
     /**
      * Return true if file is an instance of File
      * @param {Mixed} file
-     * @return {Boolean}
+     * @return {Boolean} isFile
      */
     static is(file) {
         return (file instanceof File);
@@ -44,7 +44,7 @@ class File extends Record(DEFAULTS) {
     /**
      * Create a file instance
      * @param {Mixed|File} file
-     * @return {File}
+     * @return {File} file
      */
     static create(file) {
         return File.is(file) ?
diff --git a/packages/gitbook-core/src/models/Language.js b/packages/gitbook-core/src/models/Language.js
new file mode 100644
index 0000000..20fc237
--- /dev/null
+++ b/packages/gitbook-core/src/models/Language.js
@@ -0,0 +1,12 @@
+const { Record } = require('immutable');
+
+const DEFAULTS = {
+    id:    null,
+    title: null
+};
+
+class Language extends Record(DEFAULTS) {
+
+}
+
+module.exports = Language;
diff --git a/packages/gitbook-core/src/models/Languages.js b/packages/gitbook-core/src/models/Languages.js
new file mode 100644
index 0000000..b698d14
--- /dev/null
+++ b/packages/gitbook-core/src/models/Languages.js
@@ -0,0 +1,40 @@
+const { Record, List } = require('immutable');
+const Language = require('./Language');
+const File = require('./File');
+
+const DEFAULTS = {
+    current: String(),
+    file:    new File(),
+    list:    List()
+};
+
+class Languages extends Record(DEFAULTS) {
+    constructor(spec = {}) {
+        super({
+            ...spec,
+            file: File.create(spec.file),
+            list: List(spec.list).map(lang => new Language(lang))
+        });
+    }
+
+    /**
+     * Return true if file is an instance of Languages
+     * @param {Mixed} langs
+     * @return {Boolean}
+     */
+    static is(langs) {
+        return (langs instanceof Languages);
+    }
+
+    /**
+     * Create a Languages instance
+     * @param {Mixed|Languages} langs
+     * @return {Languages}
+     */
+    static create(langs) {
+        return Languages.is(langs) ?
+            langs : new Languages(langs);
+    }
+}
+
+module.exports = Languages;