client-filter-expressions.jsm

// Execute this in a chrome-context Scratchpad or browser console
Cu.import('resource://shield-recipe-client/lib/ClientEnvironment.jsm');
Cu.import('resource://shield-recipe-client/lib/FilterExpressions.jsm');

async function main() {
  const context = ClientEnvironment.getEnvironment();
  const filterExpression = 'normandy.country == "US" && normandy.isDefaultBrowser';
  const result = await FilterExpressions.eval(filterExpression, context);
  console.log(result);
}

main()