js/i18n.js -> js/modules/i18n.js

js/modules/i18n.js

@@ -0,0 +1,36 @@
+/* eslint-env node */
+
+'use strict';
+
+exports.setup = (locale, messages) => {
+  if (!locale) {
+    throw new Error('i18n: locale parameter is required');
+  }
+  if (!messages) {
+    throw new Error('i18n: messages parameter is required');
+  }
+
+  function getMessage(key, substitutions) {
+    const entry = messages[key];
+    if (!entry) {
+      console.error(`i18n: Attempted to get translation for nonexistent key '${key}'`);
+      return '';
+    }
+
+    const { message } = entry;
+    if (Array.isArray(substitutions)) {
+      return substitutions.reduce(
+        (result, substitution) => result.replace(/\$.+?\$/, substitution),
+        message
+      );
+    } else if (substitutions) {
+      return message.replace(/\$.+?\$/, substitutions);
+    }
+
+    return message;
+  }
+
+  getMessage.getLocale = () => locale;
+
+  return getMessage;
+};