erbac in the form of a class

rbac-class.js

class RBAC {
    constructor(roles) {
        if(typeof roles !== 'object') {
            throw new TypeError('Expected an object as input');
        }
        this.roles = roles;
    }
  
    can(role, operation) {
        return this.roles[role] && this.roles[role].can.indexOf(operation) !== -1;
    }
}

module.exports = RBAC;