Added build file

Author: fengyuanchen

build/index.js

@@ -0,0 +1,53 @@
+const fs = require('fs');
+const path = require('path');
+const pkg = require('../package');
+
+const dist = path.join(__dirname, '../dist/');
+const docs = path.join(__dirname, '../docs/');
+const now = new Date();
+const banner = `/*!
+ * Viewer.js v${pkg.version}
+ * https://github.com/${pkg.repository}
+ *
+ * Copyright (c) ${now.getFullYear()} ${pkg.author.name}
+ * Released under the ${pkg.license} license
+ *
+ * Date: ${now.toISOString()}
+ */
+
+`;
+
+fs.readdirSync(dist).forEach((file) => {
+  if (!/\.(js|css)$/.test(file)) {
+    return;
+  }
+
+  const filePath = path.join(dist, file);
+  const fileData = banner + fs.readFileSync(filePath, 'utf8').toString();
+
+  fs.writeFile(filePath, fileData, (err) => {
+    if (err) {
+      throw err;
+    }
+
+    console.log(`Added banner to ${file}.`);
+
+    if (file === 'viewer.js') {
+      fs.writeFile(path.join(docs, 'js/', file), fileData, (e) => {
+        if (e) {
+          throw e;
+        }
+
+        console.log(`Copied ${file} to docs/js.`);
+      });
+    } else if (file === 'viewer.css') {
+      fs.writeFile(path.join(docs, 'css/', file), fileData, (e) => {
+        if (e) {
+          throw e;
+        }
+
+        console.log(`Copied ${file} to docs/css.`);
+      });
+    }
+  });
+});