pattern-rule

function visit(pattern, filename, code) {
  const variable = pattern.variables.get("BAR");
  
  // If the name of the variable passed is foo, raise an error
  if (variable.value === "foo") {
    // build the error being reported
    const error = buildError(pattern.start.line, pattern.start.col, pattern.end.line, pattern.end.col, "Do not use foo as a variable", "INFO", "BEST_PRACTICES");
    
    // Make an edit to replace where the variable is by "bar"
    const edit = buildEdit(variable.start.line, variable.start.col, variable.end.line, variable.end.col, "update", "bar");
    
    // Make a fix with the edit we previously built
    const fix = buildFix("use bar instead", [edit]);
    
    // add the error to the list of reported errors
    addError(error.addFix(fix));
  }
}