create migration file for dark theme

src/migrations/20200514001356-update-theme-color-for-dark.js

@@ -0,0 +1,27 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:update-theme-color-for-dark');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+const { getModelSafely } = require('@commons/util/mongoose-utils');
+
+module.exports = {
+  async up(db, client) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const Config = getModelSafely('Config') || require('@server/models/config')();
+
+    await Promise.all([
+      await Config.findOneAndUpdate({ key: 'customize:theme', value: JSON.stringify('default-dark') }, { value: JSON.stringify('default') }), // update default-dark
+      await Config.findOneAndUpdate({ key: 'customize:theme', value: JSON.stringify('blue-night') }, { value: JSON.stringify('mono-blue') }), // update blue-night
+    ]);
+
+    logger.info('Migration has successfully applied');
+  },
+
+  async down(db, client) {
+    // do not rollback
+  },
+};