stronger typing

lib/compression.luau

@@ -30,8 +30,8 @@ local compressionModule = {} :: CompressionModule
     @param opts Options table of type `types.opts`
     @return The decompressed data as a string, or false if decompression fails.
 ]]--
-function compressionModule.zlibDecompress(contents: string,  opts: types.opts): string | boolean
-    assert(typeof(contents) == "string", "Expected contents to be of type 'string'")
+function compressionModule.zlibDecompress(contents: string | buffer,  opts: types.opts): string | boolean
+    assert(typeof(contents) == "string" or typeof(contents) == "buffer", "Expected contents to be of type 'string' or 'buffer'")
     assert(typeof(opts) == "table", "Expected opts to be of type 'table'")
     local success, decompressed: string = pcall(function() return serde.decompress("zlib", contents) end)
     if not success then

tests/tests.luau

@@ -11,7 +11,7 @@ function testFolder(callback: types.callbackFunction, opts: types.opts, folderPa
     for _, file in pairs(folder) do
         local filePath = `./{folderPath}/{file}`
         local fileContents = fs.readFile(filePath)
-        local result = callback(fileContents, opts)
+        local result = callback(fileContents, opts) :: boolean
         results[file] = result
     end
     return results