package config

import (
	"bytes"

	"gopkg.in/yaml.v3"
)

// unmarshalStrict decodes YAML into v and rejects unknown fields, so a typo
// in warp.yaml fails the boot instead of being silently ignored.
func unmarshalStrict(data []byte, v any) error {
	dec := yaml.NewDecoder(bytes.NewReader(data))
	dec.KnownFields(true)
	if err := dec.Decode(v); err != nil {
		// An empty file decodes to io.EOF; treat it as "all defaults".
		if err.Error() == "EOF" {
			return nil
		}
		return err
	}
	return nil
}