coffeelint-callback-handle-error

CoffeeLint rule that finds instances of error objects passed through a callback function without being handled.

Ex: Any of these code blocks do not handle their error variable:

fs.stat '/invalid/path/to/file', (err, stats)->
  console.log stats
  return

fs.stat '/invalid/path/to/file', (err, stats)->
  # this err is not handled and is instead overwritten by the next stat 
 
  fs.stat '/some/other/invalid/file', (err, stats2)->
    if err
      console.log err
    return
  return

These examples will pass, since their error variables are handled:

fs.stat '/invalid/path/to/file', (err, stats)->
  if err
    console.log err
  return

doStuff 123, (callback)->
  fs.stat '/invalid/path/to/file', (err, stats)->
    callback err
    return
  return

Installation

npm install coffeelint-callback-handle-error

Usage

To get started, insert this configuration somewhere in your coffeelint.json file:

"callback_handle_error": {
  "module": "coffeelint-callback-handle-error"
}

Configuration

This plugin has one custom configurable option.

patterns: ["^err(or)?", "[Ee]rr(or)?$"]

A list of regular expressions used to match parameter names for detecting error objects in function parameters.

The default setting looks for any variable which starts with "err"/"error" or ends with "err"/"Err" or "error"/"Error".