wip: replace packages with pure files

packages/game/condition/CommandMatcher.ts

@@ -0,0 +1,13 @@
+import { ICommand } from '../schema'
+import { Matcher } from './Matcher.js'
+
+export class CommandMatcher implements Matcher {
+  private matcher: RegExp
+  constructor(command: string, flags?: string) {
+    this.matcher = new RegExp(command, flags)
+  }
+
+  match(command: ICommand): boolean {
+    return !!command.command && this.matcher.test(command.command)
+  }
+}