In American Distl. Co. v. City Council, Sausalito, (1950) 34 Cal.2d 660, a peremptory writ was granted plaintiffs before the completion of an annexation project. The California Supreme Court affirmed the issuance of the writ, noting that the writ procedure was proper since the remedy of quo warranto (then the exclusive method for challenging a completed annexation) had not yet matured. ( Id., at pp. 666-667.)