Первая версия

src/core/TextFilePolicy.js

@@ -0,0 +1,20 @@
+export class TextFilePolicy {
+  constructor() {
+    this.maxSizeBytes = 5 * 1024 * 1024;
+    this.allowedExtensions = new Set([
+      ".txt", ".md", ".json", ".xml", ".yaml", ".yml", ".js", ".jsx", ".ts", ".tsx",
+      ".css", ".html", ".py", ".java", ".go", ".rs", ".sql", ".sh", ".env", ".ini", ".toml"
+    ]);
+  }
+
+  isTextPath(path) {
+    const idx = path.lastIndexOf(".");
+    if (idx === -1) return true;
+    const ext = path.slice(idx).toLowerCase();
+    return this.allowedExtensions.has(ext);
+  }
+
+  isSupportedFile(path, size) {
+    return this.isTextPath(path) && size <= this.maxSizeBytes;
+  }
+}