Use babylon and babel-traverse directly to find strings to translate

lib/server/translate-plugin.js

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+/* replaces translate tags with calls to translate function */
+
+module.exports = function translatePlugin(babel) {
+  const { types: t } = babel;
+
+  return {
+    visitor: {
+      JSXElement(path) {
+        if (path.node.openingElement.name.name !== "translate") {
+          return;
+        }
+        /* assume translate element only has one child which is the text */
+        const text = path.node.children[0].value.trim();
+        let description;
+        const attributes = path.node.openingElement.attributes;
+        for (let i = 0; i < attributes.length; i++) {
+          if (attributes[i].name.name === "desc") {
+            description = attributes[i].value.value;
+          }
+        }
+        /* use an expression container if inside a jsxelement */
+        if (path.findParent(path => true).node.type === "JSXElement") {
+          path.replaceWith(
+            t.jSXExpressionContainer(
+              t.callExpression(t.identifier("translate"), [
+                t.stringLiteral(text + "|" + description)
+              ])
+            )
+          );
+        } else {
+          path.replaceWith(
+            t.callExpression(t.identifier("translate"), [
+              t.stringLiteral(text + "|" + description)
+            ])
+          );
+        }
+      }
+    }
+  };
+};