refactor: SImplify rollup plugin

Author: CGNonofr

rollup/rollup-plugin-remove-vscode-declare-module.ts

@@ -9,20 +9,15 @@ const plugin: PluginImpl<{}> = () => {
       if (id.endsWith('@types/vscode/index.d.ts')) {
         const lines = code.split('\n')
         let index = lines.indexOf('declare module \'vscode\' {')
+        if (index < 0) throw new Error('Module declaration not found')
+
         lines.splice(index, 1)
-        if (index >= 0) {
-          let end = false
-          while (!end) {
-            if (lines[index] === '}') {
-              lines.splice(index, 1)
-              end = true
-            } else {
-              // unindent
-              lines[index] = lines[index].slice(4)
-            }
-            index++
-          }
+        for (; lines[index] !== '}'; index++) {
+          // unindent
+          lines[index] = lines[index].slice(4)
         }
+        lines.splice(index, 1)
+
         return lines.join('\n')
       }
       return code