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define-error
Advanced tools
Define errors without frills, but with stack traces and instanceof support.
Define errors without frills, but with stack traces and instanceof support.
First, create and expose a singleton that defines your errors such as errors.js
:
var defineError = require('define-error')
module.exports.DatabaseError = defineError('DatabaseError')
module.exports.HttpResponseError = defineError('HttpResponseError', function (message, code) {
this.code = code
})
Then use them:
var assert = require('assert'),
DatabaseError = require('./errors').DatabaseError,
HttpResponseError = require('./errors').HttpResponseError
function query () {
throw new DatabaseError('No database to query silly')
}
function request () {
throw new HttpResponseError('Nobody out there', 404)
}
try {
query()
}
catch (err) {
assert(err instanceof DatabaseError)
assert(err instanceof Error)
console.error(err)
}
try {
request()
}
catch (err) {
assert(err instanceof HttpResponseError)
assert(!(err instanceof DatabaseError))
assert(err instanceof Error)
assert(err.code)
console.error(err)
}
var defineError = require('define-error')
Create an error constructor, CustomError(message)
. Error
will be in the prototype chain. If an initFunc
function is provided, it will be called in the context of the error being created with all arguments that were passed to the error constructor. This will happen after the message
and stack
properties are set on the error object.
With npm do:
npm install --save define-error
npm test
Or to run tests in phantom: npm run phantom
npm run view-cover
This will output a textual coverage report.
npm run open-cover
This will open an HTML coverage report in the default browser.
FAQs
Define errors without frills, but with stack traces and instanceof support.
The npm package define-error receives a total of 2,092 weekly downloads. As such, define-error popularity was classified as popular.
We found that define-error demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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