code: function(requisition) {
    if (instanceIndex(requisition.conversionContext) !== -1) {
      throw new Error('Remote existing mapping before adding a new one');
    }
  
    instances.push({
      conversionContext: requisition.conversionContext,
      executionContext: requisition.executionContext,
      mapping: { requisition: requisition }
    });
  }
docs: Add a requisition context->terminal mapping