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Showing content from https://github.com/MatthewMueller/combine-errors below:

matthewmueller/combine-errors: Simple way to combine multiple errors into one.

Simple way to combine multiple errors into one.

This is useful for handling multiple asynchronous errors, where you want to catch all the errors and combine them to return just a single error.

• error instanceof Error === true
• composable: error([error([err1, err2]), err3])
• stack and message are combined in a nice way
• array-like object, so you can access the original errors by looping over the error
• If you just have one error, it looks exactly like raw error meaning, error(err).message === err.message && error(err).stack === err.stack
• should work in the browser, though I haven't tested it yet

npm install combine-errors

var error = require('combine-errors')
var err = error([
  new Error('boom'),
  new Error('kablam')
])
throw err
/*
=>
Error: boom
    at repl:2:1
    at REPLServer.defaultEval (repl.js:262:27)
    at bound (domain.js:287:14)
    at REPLServer.runBound [as eval] (domain.js:300:12)
    at REPLServer.<anonymous> (repl.js:431:12)
    at emitOne (events.js:95:20)
    at REPLServer.emit (events.js:182:7)
    at REPLServer.Interface._onLine (readline.js:211:10)
    at REPLServer.Interface._line (readline.js:550:8)
    at REPLServer.Interface._ttyWrite (readline.js:827:14)

Error: kablam
    at repl:3:1
    at REPLServer.defaultEval (repl.js:262:27)
    at bound (domain.js:287:14)
    at REPLServer.runBound [as eval] (domain.js:300:12)
    at REPLServer.<anonymous> (repl.js:431:12)
    at emitOne (events.js:95:20)
    at REPLServer.emit (events.js:182:7)
    at REPLServer.Interface._onLine (readline.js:211:10)
    at REPLServer.Interface._line (readline.js:550:8)
    at REPLServer.Interface._ttyWrite (readline.js:827:14)
*/

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