Add minimumBytes property to file-type

types/file-type/file-type-tests.ts

@@ -2,3 +2,5 @@ import fileType = require("file-type");
 
 fileType(new Buffer([0xFF, 0xD8, 0xFF]));
 fileType(new Uint8Array([0xFF, 0xD8, 0xFF]));
+
+const minimumBytes: number = fileType.minimumBytes;

types/file-type/index.d.ts

@@ -15,4 +15,6 @@ declare namespace FileType {
         ext: string;
         mime: string;
     }
+
+    const minimumBytes: number;
 }