refactor: script wrapper

rollup.config.js

@@ -15,8 +15,9 @@ const getBannerText = () => {
     return bannerText
 }
 
-const getIntro = () => {
-    return fs.readFileSync("./src/intro.js", "utf-8")
+const getWrapper = (startL, endL) => {
+    const js = fs.readFileSync("./src/wrapper.js", "utf-8")
+    return js.split(/\n/g).slice(startL, endL).join("\n")
 }
 
 const basePlugins = [
@@ -87,8 +88,8 @@ export default [
             format: "iife",
             sourcemap: false,
             banner: getBannerText,
-            intro: getIntro,
-            outro: "}.toString() + ')()');document.body.prepend(d)})"
+            intro: () => getWrapper(0, -1),
+            outro: () => getWrapper(-1)
         },
         plugins,
     },

src/wrapper.js

@@ -1,3 +1,4 @@
+/* eslint-disable */
 const w = typeof unsafeWindow == 'object' ? unsafeWindow : window;
 
 // GM APIs glue
@@ -38,3 +39,6 @@ new Promise(resolve => {
   d.src = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
   d.once = false;
   d.setAttribute('onload', `if(this.once)return;this.once=true;this.remove();const GM=window['${gmId}'];delete window['${gmId}'];(` + function a () {
+  /** script code here */
+
+}.toString() + ')()');document.body.prepend(d)})