feat: add file matcher

packages/game/src/condition/FileMatcher.ts

@@ -0,0 +1,15 @@
+import { FileInput, IFileExistenceChecker } from '../types'
+
+interface FileExistenceInput extends FileInput {
+  exists: boolean
+}
+
+export async function checkFiles(
+  checker: IFileExistenceChecker,
+  files: FileExistenceInput[]
+) {
+  const existences = await Promise.all(
+    files.map((file) => checker.exists(file))
+  )
+  return existences.every((exists, index) => exists === files[index].exists)
+}

packages/game/src/types.ts

@@ -13,3 +13,17 @@ export interface ICondition {
   or?: ICondition[]
   not?: ICondition
 }
+
+export enum FileType {
+  FILE = 'file',
+  FOLDER = 'folder',
+}
+
+export interface FileInput {
+  path: string
+  type: FileType
+}
+
+export interface IFileExistenceChecker {
+  exists(file: FileInput): Promise<boolean>
+}