toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (file != null) 'file': file!,
if (freq != null) 'freq': freq!,
if (mntops != null) 'mntops': mntops!,
if (passno != null) 'passno': passno!,
if (spec != null) 'spec': spec!,
if (vfstype != null) 'vfstype': vfstype!,
};