type FileWalker interface {
	// Walk invokes fn for each file.
	Walk(fn func(filename string, r io.Reader) error) error
}

type Stats struct {
	// FileName is the name of the file.
	FileName string
	// Version is the version of the migration.
	Version int64
	// Tx is true if the .sql migration file has a +goose NO TRANSACTION annotation
	// or the .go migration file calls AddMigrationNoTx.
	Tx bool
	// UpCount is the number of statements in the Up migration.
	UpCount int
	// DownCount is the number of statements in the Down migration.
	DownCount int
}