How to use the json-schema/lib/validate.mustBeValid function in json-schema

if(facetPrototype.save){
									facetPrototype.save.call(this, directives);
								}
								var validation = validate(this, facetSchema);
								var instance = this;
								for(i in this){
									if(this.hasOwnProperty(i)){
										transfer(this[i]);
									}
								}
								for (i in source){
									if(source.hasOwnProperty(i) && !this.hasOwnProperty(i)){
										transfer(undefined);
									}
								}
								mustBeValid(validation);
								var isNew = partial === NEW;
								if(isNew && (typeof facetSchema.add === "function")){ //  || )
									partial = undefined;
									id = facetSchema.add(source, directives);
								}
								else if(typeof facetSchema.put === "function"){
									if(isNew){
										directives.overwrite = false;
									}
									id = facetSchema.put(source, directives);
								}
								else if(permissive && isNew && typeof sourceClass.add === "function"){
									id = sourceClass.add(source, directives);
								}
								else if(permissive && typeof sourceClass.put === "function"){
									if(isNew){