custom-verror
v0.1.1
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Simple class extending VError for easy custom error creation
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Custom VError
Simple class extending VError for easy custom error creation.
Usage
Here is the basic usage. For more use cases, see the tests.
1. Define your error
UserNotAllowedError.js
'use strict';
const CustomVError = require('custom-verror');
// Replace UserNotAllowedError with your custom error name
module.exports = class UserNotAllowedError extends CustomVError {
constructor(...args) {
super(...args);
// Provide a default message
this.message = this.message || 'User is not allowed to perform this action';
}
};
2. Throw your error
const UserNotAllowedError = require('./UserNotAllowedError');
function performAction() {
if (!isAllowed) {
throw new UserNotAllowedError({
// You can provide some error metadata. This will be appended to the message
info: {
user_id: user._id
}
})
}
}
3. Catch your error
try {
performAction();
} catch (ex) {
if (ex instanceof UserNotAllowedError) {
numberOfTimesUsersTriedToDoSomethingTheyWerentSupposedTo++;
// This will log the default message and the metadata in following format:
// "User is not allowed to perform this action user_id=FOO"
console.log(ex);
}
}