How to use the knex.Client function in knex

export function install () {
  Object.defineProperty(knex.Client.prototype, 'tenantId', {
    get: function() {
      return this.config.tenantId;
    },
  });

  override(QueryBuilder.prototype, 'toSQL', after(function(sql) {
    debug('knex.Client.prototype.QueryBuilder.prototype.toSQL', arguments);
    sql.sql = applyTenant(sql.sql, this.client.tenantId);
    return sql;
  }));

  override(Raw.prototype, 'set', before(function(sql, bindings) {
    debug('knex.Client.prototype.Raw.prototype.set', arguments);
    const tenantSQL = applyTenant(sql, this.client.tenantId);
    return [tenantSQL, bindings];
  }));