const MirrorsUsed({symbols, targets, metaTargets, override })

See the documentation for MirrorsUsed.symbols, MirrorsUsed.targets, MirrorsUsed.metaTargets and MirrorsUsed.override for documentation of the parameters.

Source 

const MirrorsUsed(
    {this.symbols, this.targets, this.metaTargets, this.override});