It's an interactive tool for cloning Looker Studio (previously known as Data Studio) dashboards.
The tool asks a series of question and generates a Linking API link, once opened it copies a dashboard with all its datasources.
npm i -g lsd-cloner
Once installed globally (with -g option) it provides lsd-cloner CLI tool. Run it and follow instructions.
Run with pre-polulated answers:
lsd-cloner --answers=answers.json
save answers into a file:
lsd-cloner --save=answers.json
You can run it in a non-interactive environment (SSH), just open a generated link manually.
The tool creates a link for cloning a dashboard with data sources backed by BigQuery tables (or views). When you're cloning a dashboard you need to clone its data sources and retarget them to your own tables in a different project/dataset comparing to where they are for templated dashboard. So you'll be asked to specify a GCP project id and dataset id (where resulting tables located). Then for each data sources that the dashboard uses you'll need to supply its alias (go to Edit/ Manage added Data Sources - rightmost column in datasource list displays alias) and a table name with new data.
This is not an officially supported Google product.