This module allows you to easily extend the built-in Error type for typed error checking
For typescript:
import { TypedError } from 'typed-error'
class MyError extends TypedError {}
try {
throw new MyError()
} catch(e) {
console.log(e instanceof MyError) // true
console.log(e.name) // 'MyError'
console.log(e.constructor.name) // 'MyError'
console.log(e.stack) // <stack trace>
if(e instanceof MyError) {
console.log('Do custom handling')
} else {
console.log('Another type of error')
}
// Or
switch(e.name) {
case 'MyError':
console.log('Do custom handling')
break;
default:
console.log('Another type of error')
}
// Or
switch(e.constructor.name) {
case 'MyError':
console.log('Do custom handling')
break;
default:
console.log('Another type of error')
}
}And with bluebird:
import { TypedError } from 'typed-error'
import * as Promise from 'bluebird'
class MyError extends TypedError {}
Promise.try(() => {
throw new MyError()
})
.catch(MyError, (e) => {
console.log('Do custom handling')
})
.catch(() => {
console.log('Another type of error')
})
// Or
const MyErrorName = (e: Error) => e.name === 'MyError'
Promise.try(() => {
throw new MyError()
})
.catch(MyErrorName, (e) => {
console.log('Do custom handling')
})
.catch(() => {
console.log('Another type of error')
})
// Or
const MyErrorConstructorName = (e: Error) => e.constructor.name === 'MyError'
Promise.try(() => {
throw new MyError()
})
.catch(MyErrorConstructorName, (e) => {
console.log('Do custom handling')
})
.catch(() => {
console.log('Another type of error')
})For coffeescript:
{ TypedError } = require 'typed-error'
class MyError extends TypedError
try
throw new MyError()
catch e
console.log(e instanceof MyError) # true
console.log(e.name) # 'MyError'
console.log(e.constructor.name) # 'MyError'
console.log(e.stack) # <stack trace>
if e instanceof MyError
console.log('Do custom handling')
else
console.log('Another type of error')
# Or
switch e.name
when 'MyError'
console.log('Do custom handling')
else
console.log('Another type of error')
# Or
switch e.constructor.name
when 'MyError'
console.log('Do custom handling')
else
console.log('Another type of error')And with bluebird:
Promise = require 'bluebird'
{ TypedError } = require 'typed-error'
class MyError extends TypedError
Promise.try ->
throw new MyError()
.catch MyError, (e) ->
console.log('Do custom handling')
.catch ->
console.log('Another type of error')
# Or
MyErrorName = (e) -> e.name is 'MyError'
Promise.try ->
throw new MyError()
.catch MyErrorName, (e) ->
console.log('Do custom handling')
.catch ->
console.log('Another type of error')
# Or
MyErrorConstructorName = (e) -> e.constructor.name is 'MyError'
Promise.try ->
throw new MyError()
.catch MyErrorConstructorName, (e) ->
console.log('Do custom handling')
.catch ->
console.log('Another type of error')