Create custom errors that inherit Error
npm install custom-errorCreate custom errors that inherit Error.
Extending Error is a real pain, so this library deals with the quirks, providing a clean API to extend Error that works across JS environments, including Node and browsers.
Calling customError(errorTitle[, ParentError]) creates a new error class that can be called the
same way that Error is called. The new error constructor will inherit from Error, or fromParentError if you provide it.
`` js
var customError = require('custom-error');
var ApocalypseError = customError('ApocalypseError');
ApocalypseError() instanceof Error // true
ApocalypseError() instanceof ApocalypseError // true
var UnixApocalypseError = customError('UnixApocalypseError', ApocalypseError)
UnixApocalypseError() instanceof Error // true
UnixApocalypseError() instanceof ApocalypseError // true
UnixApocalypseError() instanceof UnixApocalypseError // true
if (new Date().getFullYear() === 2038) {
throw UnixApocalypseError('OH NOES')
}
`
` js
UnixApocalypseError.prototype.year = 2038
try {
throw UnixApocalypseError()
}
catch (err) {
console.log(err.year) // 2038
}
`
` bash``
npm install custom-error
MIT