Implement minimal file collection + diff apply helpers (#7)

* create helpers
* export helpers
* update deps

Author: isabellahoch

package.json

@@ -26,11 +26,11 @@
     "lint": "./scripts/lint",
     "fix": "./scripts/format"
   },
-  "dependencies": {},
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.17.0",
     "@swc/core": "^1.3.102",
     "@swc/jest": "^0.2.29",
+    "@types/glob": "^8.1.0",
     "@types/jest": "^29.4.0",
     "@types/node": "^20.17.6",
     "@typescript-eslint/eslint-plugin": "8.31.1",

src/index.ts

@@ -20,3 +20,5 @@ export {
   PermissionDeniedError,
   UnprocessableEntityError,
 } from './core/error';
+
+export { collectFiles, applyChanges, type FileData } from './lib/helpers';

src/lib/helpers.ts

@@ -0,0 +1,85 @@
+import fs from 'fs';
+import path from 'path';
+import { glob } from 'glob';
+
+export interface FileData {
+  path: string;
+  contents: string;
+}
+
+const DEFAULT_PATTERNS = [
+  '**/*.ts', '**/*.tsx', '**/*.js', '**/*.jsx',
+  '**/package.json', '**/tsconfig*.json', '**/*.config.*'
+];
+
+const DEFAULT_IGNORE = [
+  'node_modules/**',
+  '.claude/**',
+  '.git/**',
+  'dist/**',
+  'build/**',
+  '.next/**',
+  'coverage/**',
+  '**/.env*'
+];
+
+export async function collectFiles(
+  basePath: string = process.cwd(),
+  patterns: string[] = DEFAULT_PATTERNS,
+  ignore: string[] = DEFAULT_IGNORE
+): Promise<FileData[]> {
+  const originalCwd = process.cwd();
+  
+  try {
+    process.chdir(basePath);
+    
+    const allFilePaths: string[] = [];
+    for (const pattern of patterns) {
+      const filePaths = await glob(pattern, {
+        ignore,
+        nodir: true,
+        absolute: false
+      });
+      allFilePaths.push(...filePaths);
+    }
+    
+    const filePaths = [...new Set(allFilePaths)];
+
+    const files: FileData[] = [];
+
+    for (const filePath of filePaths) {
+      try {
+        const content = fs.readFileSync(path.resolve(basePath, filePath), 'utf8');
+        if (content.trim()) {
+          files.push({ 
+            path: filePath, 
+            content 
+          });
+        }
+      } catch {
+        continue;
+      }
+    }
+
+    return files;
+  } finally {
+    process.chdir(originalCwd);
+  }
+}
+
+export function applyChanges(
+  changedFiles: FileData[],
+  basePath: string = process.cwd()
+): void {
+  for (const file of changedFiles) {
+    try {
+      const fullPath = path.resolve(basePath, file.path);
+      const dirPath = path.dirname(fullPath);
+      
+      fs.mkdirSync(dirPath, { recursive: true });
+      fs.writeFileSync(fullPath, file.contents, 'utf8');
+    } catch {
+      continue;
+    }
+  }
+}

yarn.lock

@@ -891,6 +891,14 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.6.tgz#628effeeae2064a1b4e79f78e81d87b7e5fc7b50"
   integrity sha512-AYnb1nQyY49te+VRAVgmzfcgjYS91mY5P0TKUDCLEM+gNnA+3T6rWITXRLYCpahpqSQbN5cE+gHpnPyXjHWxcw==
 
+"@types/glob@^8.1.0":
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/@types/glob/-/glob-8.1.0.tgz#b63e70155391b0584dce44e7ea25190bbc38f2fc"
+  integrity sha512-IO+MJPVhoqz+28h1qLAcBEH2+xHMK6MTyHJc7MTnnYb6wsoLR29POVGJ7LycmVXIqyy/4/2ShP5sUwTXuOwb/w==
+  dependencies:
+    "@types/minimatch" "^5.1.2"
+    "@types/node" "*"
+
 "@types/graceful-fs@^4.1.3":
   version "4.1.9"
   resolved "https://registry.yarnpkg.com/@types/graceful-fs/-/graceful-fs-4.1.9.tgz#2a06bc0f68a20ab37b3e36aa238be6abdf49e8b4"
@@ -930,6 +938,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
   integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
 
+"@types/minimatch@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-5.1.2.tgz#07508b45797cb81ec3f273011b054cd0755eddca"
+  integrity sha512-K0VQKziLUWkVKiRVrx4a40iPaxTUefQmjtkQofBkYRcoaaL/8rhwDWww9qWbrgicNOgnpIsMxyNIUM4+n6dUIA==
+
 "@types/node@*":
   version "20.10.5"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-20.10.5.tgz#47ad460b514096b7ed63a1dae26fad0914ed3ab2"