[Home](./index.md) > [ember-asset-size-report](./ember-asset-size-report.md) > [GenerateReportOptions](./ember-asset-size-report.generatereportoptions.md) > [appendData](./ember-asset-size-report.generatereportoptions.appenddata.md) ## GenerateReportOptions.appendData property > This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment. > if csv file is found to already exist, should we amend data to it or replace it? Signature: ```typescript appendData: boolean; ```