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Commite11f87d

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Add isHttpError export to determine if value is an HTTP error
closes#56
1 parentd32bcc4 commite11f87d

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4 files changed

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4 files changed

+87
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‎HISTORY.md‎

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@@ -1,6 +1,7 @@
11
unreleased
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==========
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* Add`isHttpError` export to determine if value is an HTTP error
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* deps: setprototypeof@1.2.0
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67
2019-06-24 / 1.7.3

‎README.md‎

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@@ -88,6 +88,14 @@ fs.readFile('foo.txt', function (err, buf) {
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-`error` - the error object to extend
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-`properties` - custom properties to attach to the object
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###createError.isHttpError(val)
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Determine if the provided`val` is an`HttpError`. This will return`true`
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if the error inherits from the`HttpError` constructor of this module or
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matches the "duck type" for an error this module creates. All outputs from
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the`createError` factory will return`true` for this function, including
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if an non-`HttpError` was passed into the factory.
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###new createError\[code || name\](\[msg]\))
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Create a new error object with the given message`msg`.

‎index.js‎

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@@ -25,6 +25,7 @@ var toIdentifier = require('toidentifier')
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module.exports=createError
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module.exports.HttpError=createHttpErrorConstructor()
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module.exports.isHttpError=createIsHttpErrorFunction(module.exports.HttpError)
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// Populate exports for all constructors
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populateConstructorExports(module.exports,statuses.codes,module.exports.HttpError)
@@ -172,6 +173,27 @@ function createClientErrorConstructor (HttpError, name, code) {
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returnClientError
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}
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/**
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* Create function to test is a value is a HttpError.
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*@private
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*/
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functioncreateIsHttpErrorFunction(HttpError){
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returnfunctionisHttpError(val){
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if(!val||typeofval!=='object'){
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returnfalse
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}
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if(valinstanceofHttpError){
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returntrue
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}
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returnvalinstanceofError&&
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typeofval.expose==='boolean'&&
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typeofval.statusCode==='number'&&val.status===val.statusCode
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}
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}
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/**
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* Create a constructor for a server error.
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*@private

‎test/test.js‎

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@@ -122,6 +122,62 @@ describe('createError(status, message)', function () {
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})
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})
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describe('createError.isHttpError(val)',function(){
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describe('when val is undefined',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError(undefined),false)
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})
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})
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describe('when val is null',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError(null),false)
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})
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})
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describe('when val is a number',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError(42),false)
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})
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})
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describe('when val is a string',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError('foobar'),false)
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})
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})
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describe('when val is an empty object',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError({}),false)
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})
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})
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describe('when val is a plain Error',function(){
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it('should return false',function(){
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assert.strictEqual(createError.isHttpError(newError()),false)
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})
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})
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describe('when val is an instance of HttpError',function(){
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it('should return true',function(){
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varerr=createError(500)
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assert.ok(errinstanceofcreateError.HttpError)
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assert.strictEqual(createError.isHttpError(err),true)
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})
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})
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describe('when val is an Error passed to createError',function(){
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it('should return true',function(){
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varerr=createError(500,newError())
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assert.ok(!(errinstanceofcreateError.HttpError))
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assert.strictEqual(createError.isHttpError(err),true)
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})
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})
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})
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describe('HTTP Errors',function(){
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it('createError(status, props)',function(){
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varerr=createError(404,{

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