chore: support GM method

src/monkey/polyfill/GM.ts

@@ -0,0 +1,8 @@
+const thisGlobal = window
+
+if (typeof thisGlobal.GM === 'undefined') {
+  thisGlobal.GM = {} as any
+}
+
+export function getGMWindow () { return thisGlobal }
+

src/monkey/polyfill/GM_addStyle.ts

@@ -1,13 +1,21 @@
-if (typeof (window as any).GM_addStyle == 'undefined') {
-  (window as any).GM_addStyle = (cssContent: string) => {
-    let head = document.getElementsByTagName('head')[0]
+import { getGMWindow } from "./GM"
+
+const w = getGMWindow()
+
+if (typeof w.GM_addStyle === 'undefined') {
+  w.GM_addStyle = function GM_addStyle(cssContent: string) {
+    const head = document.getElementsByTagName('head')[0]
     if (head) {
-      let style = document.createElement('style')
-      style.setAttribute('type', 'text/css')
-      style.textContent = cssContent
-      head.appendChild(style)
-      return style
+      const styleElement = document.createElement('style')
+      styleElement.setAttribute('type', 'text/css')
+      styleElement.textContent = cssContent
+      head.appendChild(styleElement)
+      return styleElement
     }
     return null
   }
 }
+
+if (typeof w.GM.addStyle === 'undefined') {
+  w.GM.addStyle = GM_addStyle
+}

types/monkey.d.ts

@@ -1,3 +1,12 @@
-declare function GM_addStyle(content: string): undefined;
+declare function GM_addStyle(content: string): any;
 declare function GM_setValue(key: string, value: T): undefined;
 declare function GM_getValue<T>(key: string, defaultValue: T): T
+
+declare interface Window {
+  GM: {
+    addStyle: GM_addStyle,
+  },
+  GM_addStyle: GM_addStyle,
+  GM_setValue: GM_setValue,
+  GM_getValue: GM_getValue,
+}