Sidewalk is a Vale package containing LibreOffice's American English dictionary, and nothing more.
Sidewalk is named after the American English synonym for "pavement" in British English.
Original implementation by Ben Cromwell for British English.
The package uses LibreOffice's open source Hunspell compatible dictionaries.
To get started, add the package to your configuration file (as shown below) and then run vale sync.
StylesPath = styles
MinAlertLevel = suggestion
Packages = https://github.com/adamsharifc/sidewalk/releases/latest/download/sidewalk.zip
[*]
BasedOnStyles = Vale, Sidewalk