wip: replace packages with pure files

packages/game/condition/ErrorMatcher.ts

@@ -0,0 +1,18 @@
+import { Matcher } from './Matcher.js'
+import { ICommand } from '../schema'
+
+export class ErrorMatcher implements Matcher {
+  private matcher?: RegExp
+  constructor(errorPattern?: string) {
+    if (errorPattern) {
+      this.matcher = new RegExp(errorPattern)
+    }
+  }
+
+  match(command: ICommand): boolean {
+    if (!this.matcher) {
+      return !command.error
+    }
+    return this.matcher.test(command.error || '')
+  }
+}