errorist

If you don't have an Error, errorist gives you one

Install

$ npm install errorist

Usage

var errorist = require('errorist');

function asyncFunc(callback) {
  process.nextTick(function() {
    callback('this is not an Error; it is a string');
  });
}

asyncFunc(function(err) {
  if (err) {
    // you would never do a thing like throw a string, right?
    throw errorist(err);
  }
});

// or with promises
require('bluebird').promisify(asyncFunc)()
  .catch(err) {
    // stack trace FTW
    throw errorist(err);
  });

Notes

errorist's flow is a bit like this:

• If the value is an Error
  • return it.
• If the value is a non-null object or function
  • and its message property is a string
    • return a new Error with the message.
  • otherwise
    • stringify the object into JSON
    • upon success
      • return the stringified object as the Error's message.
    • otherwise
      • return an empty Error instance.
• Otherwise
  • return an Error instance with the primitive, null, or undefined value as its message.

License

© 2015 Christopher Hiller. Licensed MIT.