I'm using the following code that works perfectly on es6fiddle:
const o1 = { aa: 11, bb: 22, cc: 33 };
let { aa, ...o2 } = o1;
console.log(o1.aa);
console.log(o2.cc);
(purpose of the code above is to remove aa element from o1, store the rest in o2, without mutating o1).
It works on web, but when I try to execute this code from my console it doesn't work. I tried with latest node (6.9.1 and 7.1.0), and it doesn't work. When I look at specs for these versions, seems like it should work.
Here is error message I got in my console:
$ node src/lru-cache.js
/home/admin/experiments/ct/src/lru-cache.js:2
let { aa, ...o2 } = o1;
^^^
SyntaxError: Unexpected token ...
at Object.exports.runInThisContext (vm.js:76:16)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
at startup (bootstrap_node.js:149:9)
at bootstrap_node.js:509:3
$ node -v
v6.9.1
What's wrong with my configuration and how can I make it work? Thanks!
The syntax you're using is called object rest properties. It isn't supported by Node.js yet; in fact, the only platform that currently supports it is Babel (see ES Next compatibility table).
Related
Using this with some Kubernetes PODS and one of the pods out of the blue gives me this error. It seems to come from the call on line 6. Have not changed anything was just doing a deployment on gitlab and noticed this POD said CrashLoopBackOff.
/app/config/auth.js line 6
var dateFormat = require('dateformat');
My nodemodules folder has the latest dateFormat.js from package.json
So not sure what the problem is. Does someone know how to fix it?
var token=/d{1,4}|D{3,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|W{1,2}|[LlopSZN]|"[^"]*"|'[^']*'/g;var timezone=/\b(?:[A-Z]{1,3}[A-Z][TC])(?:[-+]\d{4})?|((?:Australian )?(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time)\b/g;var timezoneClip=/[^-+\dA-Z]/g;export default function dateFormat(date,mask,utc,gmt){if(arguments.length===1&&typeof date==="string"&&!/\d/.test(date)){mask=date;date=undefined}date=date||date===0?date:new Date;if(!(date instanceof Date)){date=new Date(date)}if(isNaN(date)){throw TypeError("Invalid date")}mask=String(masks[mask]||mask||masks["default"]);var maskSlice=mask.slice(0,4);if(maskSlice==="UTC:"||maskSlice==="GMT:"){mask=mask.slice(4);utc=true;if(maskSlice==="GMT:"){gmt=true}}var _=function _(){return utc?"getUTC":"get"};var _d=function d(){return date[_()+"Date"]()};var D=function D(){return date[_()+"Day"]()};var _m=function m(){return date[_()+"Month"]()};var y=function y(){return date[_()+"FullYear"]
SyntaxError: Unexpected token export
at Module._compile (internal/modules/cjs/loader.js:760:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:827:10)
at Module.load (internal/modules/cjs/loader.js:685:32)
at Function.Module._load (internal/modules/cjs/loader.js:620:12)
at Module.require (internal/modules/cjs/loader.js:723:19)
at require (internal/modules/cjs/helpers.js:14:16)
at Object.<anonymous> (/app/config/auth.js:6:18)
at Module._compile (internal/modules/cjs/loader.js:816:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:827:10)
at Module.load (internal/modules/cjs/loader.js:685:32)
at Function.Module._load (internal/modules/cjs/loader.js:620:12)
at Module.require (internal/modules/cjs/loader.js:723:19)
at require (internal/modules/cjs/helpers.js:14:16)
at Object.<anonymous> (/app/config/passport.js:8:18)
at Module._compile (internal/modules/cjs/loader.js:816:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:827:10)```
Was able to fix it by downloading an older version of dateformat. Nothing wrong with my code on the question its a simple problem with the library not the code come on.
Here I could make it work by using another version of this package,was working in the version 4.6.3, so I did:
npm i dateformat#4.6.3
I habe the following line of code in my js file:
const { connectDb } = require("./db");
When I run nodejs locally everthing is fine and I dont get an error.
Im using v10.16.0 locally. When I put that on a server, I got the follwoing error:
2019-07-23 15:49:36.925754500 const { connectDb } = require("./db");
2019-07-23 15:49:36.925779500 ^
2019-07-23 15:49:36.930604500 SyntaxError: Unexpected token {
2019-07-23 15:49:36.930606500 at Module._compile (module.js:439:25)
2019-07-23 15:49:36.930607500 at Object.Module._extensions..js (module.js:474:10)
2019-07-23 15:49:36.930608500 at Module.load (module.js:356:32)
2019-07-23 15:49:36.930609500 at Function.Module._load (module.js:312:12)
2019-07-23 15:49:36.930610500 at Function.Module.runMain (module.js:497:10)
2019-07-23 15:49:36.930611500 at startup (node.js:119:16)
2019-07-23 15:49:36.930612500 at node.js:945:3
I'm running Version v0.10.43 on that server. What am I doing wrong?
I'm running Version v0.10.43 on that server. What am I doing wrong?
You're running v0.10.43.
Is it too old to support destructuring (which was added in 6.0.0 … which is also past end of life!).
You could replace it with:
const connectDb = require("./db").connectDb
… but are likely to run into other problems down the line.
v0.10.43 is from 2013. It is over half a decade old. It is past the end of life. It is not supported. It does not get security releases. Don't use it.
Use a supported version instead.
I was taking a Udemy course, here is my code for an exercise that I was doing.
Faker is a package downloaded from the NPM library
var faker = require("faker");
console.log("+++++++++++++++++++");
console.log("Welcome to my shop!");
console.log("+++++++++++++++++++");
var data = faker.commerce.productName();
data.forEach(function(print){
console.log(data);
});
I was expecting the code to iterate over every item in the variable "data" and print the result, however this is the result I get
+++++++++++++++++++
Welcome to my shop!
+++++++++++++++++++
/home/ubuntu/workspace/node_practice/demo_app/app.js:8
data.forEach(function(print){
^
TypeError: data.forEach is not a function
at Object.<anonymous> (/home/ubuntu/workspace/node_practice/demo_app/app.js:8:6)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:389:7)
at startup (bootstrap_node.js:149:9)
at bootstrap_node.js:504:3
I am using Cloud9 ide, why am I getting this error?
You should read the faker documentation.
https://cdn.rawgit.com/Marak/faker.js/master/examples/browser/index.html#commerce
faker.commerce.productName() is a string. Those don't have a prototype.forEach()
If you'd like to generate a set of names you can use Array.from() with faker like so:
let products = Array
.from({length: 100})
.map(faker.commerce.productName)
You now have an Array of 100 product name
I am trying to run one of the sample projects using appjs which is present over here https://github.com/appjs/appjs/tree/master/examples. I am using the latest version of node.js (v4.1.0
) on Windows (64 bit machine)
When I try and run the example using the below command on Command Prompt
node --harmony index.js
I get an error as follows,
Error: AppJS requires Node is run with the --harmony command line flag
at Object.<anonymous> (F:\programs\appjs_examples\node_modules\appjs\lib\ind
ex.js:2:9)
at Module._compile (module.js:434:26)
at Object.Module._extensions..js (module.js:452:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (F:\programs\appjs_examples\octosocial\index.js:1:73)
at Module._compile (module.js:434:26)
at Object.Module._extensions..js (module.js:452:10)
I tried searching for this issue but I couldn't find a solution. Can anyone tell me how to use node.js with the harmony flag?
UPDATE
My index.js looks like this
var app = require('appjs'),
github = new (require('github'))({ version: '3.0.0' }),
KEY_F12 = process.platform === 'darwin' ? 63247 : 123;
app.serveFilesFrom(__dirname + '/assets');
var window = app.createWindow({
width: 460,
height: 640,
resizable: false,
disableSecurity: true,
icons: __dirname + '/assets/icons'
});
window.on('create', function(){
window.frame.show();
window.frame.center();
});
window.on('ready', function(){
var $ = window.$,
$username = $('input[name=username]'),
$password = $('input[name=password]'),
$info = $('#info-login'),
$label = $info.find('span'),
$buttons = $('input, button');
$(window).on('keydown', function(e){
if (e.keyCode === KEY_F12) {
window.frame.openDevTools();
}
});
$username.focus();
$('#login-form').submit(function(e){
e.preventDefault();
$info.removeClass('error').addClass('success');
$label.text('Logging in...');
$buttons.attr('disabled', true);
github.authenticate({
type: 'basic',
username: $username.val(),
password: $password.val()
});
github.user.get({}, function(err, result) {
if (err) {
$info.removeClass('success').addClass('error');
$label.text('Login Failed. Try Again.');
$buttons.removeAttr('disabled');
} else {
loggedIn(result);
}
});
});
function loggedIn(result){
$label.text('Logged in!');
$('#user-avatar').append('<img src="'+result.avatar_url+'" width="64" height="64">');
$('#user-name').text(result.name);
$('#login-section').hide();
$('#profile-section').show();
['Followers', 'Following'].forEach(function(type){
github.user['get'+type]({ user: result.login }, populate.bind(null, type.toLowerCase()));
});
}
Now with v0.12 of Node.js I get below error
F:\softwares\Node.js_v0.12\node_modules\appjs\lib\index.js:2
throw new Error ('AppJS requires Node is run with the --harmony command line
Error: AppJS requires Node is run with the --harmony command line flag
at Object.<anonymous> (F:\softwares\Node.js_v0.12\node_modules\appjs\lib\ind
ex.js:2:9)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (F:\softwares\Node.js_v0.12\index.js:1:73)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
Just tested your code out locally with node v0.12.7 and v4.0.0. Looks like the node_modules/appjs/lib/index.js check makes sure that proxy is enabled no matter what.
By default the --harmony flag does not enable proxies. However you can use --harmony_proxies.
To help you understand what is happening:
Open node in your terminal, Then type Proxy. You will get 'Proxy is not defined'.
Now, open node --harmony in your terminal and do the same. You will get the same output.
Now, with node --harmony-proxies. Bam, you get an empty object.
You should be able to run this with v4.x.x however, you will still need the proxies flag for harmony.
When the merge happened with node.js and io.js for v4 they released a page of ES6 features that are shipped if you are using 4.x.x. https://nodejs.org/en/docs/es6/
https://github.com/appjs/appjs is deprecated btw, but once you pass the module's test of features, it will require 32bit ;)
Edit:
To properly run your app use the following:
node --harmony-proxies index.js
Here is a screenshot to show the expected output from step 3 above.
I am working through Brad Dayley's Node.js, MongoDB and Angularjs book and I'm stuck on one of his exercises (Listing 4.4). I have a simple script emitterListener.js that is as follows the script is designed to makes checks on an account.
var events = require('events');
function Account() {
this.balance = 0;
events.EventEmitter.call(this);
this.deposit = function(amount) {
this.balance += amount;
this.emit('balanceChanged');
};
this.withdraw = function(amount) {
this.balance -= amount;
this.emit('balanceChanged');
};
}
Account.prototype._proto_ = events.EventEmitter.prototype;
function displayBalance() {
console.log("Account balance: $%d", this.balance);
}
function checkOverdraw() {
if (this.balance < 0) {
console.log("Account Overdrawn!!!!!");
}
}
function checkGoal(acc, goal) {
if (acc.balance > goal) {
console.log("Goal Achieved!!!!!");
}
}
var account = new Account();
account.on("balanceChanged", displayBalance);
account.on("balanceChanged", checkOverdraw);
account.on("balanceChanged", function() {
checkGoal(this, 1000);
});
account.deposit(220);
account.deposit(320);
account.deposit(600);
account.withdraw(1200);
When I run this I get the error.
TypeError: Object #<Account> has no method 'on'
at Object.<anonymous> (/Users/506132/web/emitterListener.js:35:9)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
From my limited understanding after researching I think this means that the "on" module is not being loaded. I found a solution that suggested something similar to adding this to line 1
var events = require('events').on;
which then results in the error.
TypeError: Cannot read property 'EventEmitter' of undefined
at Object.<anonymous> (/Users/506132/web/emitterListener.js:16:35)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
Following the logic from the first fix I tried implementing the same fix but with EventEmitter
var events = require('events').EventEmitter;
Hooray it looks like it worked.... or not......and now I get this error
TypeError: Cannot read property 'prototype' of undefined
at Object.<anonymous> (/Users/506132/web/emitterListener.js:17:48)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
I tried adding the below code thinking why not?
var events = require('events').prototype;
and it just brings me back to the same error from before
TypeError: Cannot read property 'EventEmitter' of undefined
at Object.<anonymous> (/Users/506132/web/emitterListener.js:16:35)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
What am I doing wrong here? How should I go about debugging this and where should I look? Thanks in advance for helping a newbie out.
Cheers.
process.EventEmitter is deprecated, use require('events') instead.
Search through all your reference files (should be in multiple files) for:
var EventEmitter = process.EventEmitter
An where ever it exists, change that line to this:
var EventEmitter = require('events')
I'll post it as an answer so this question won't get marked as unanswered.
You should change:
Account.prototype.__proto__ = events.EventEmitter.prototype;
to:
Account.prototype = Object.create(events.EventEmitter.prototype);
var EventEmitter = process.EventEmitter
is deprecated in high version of node, use var EventEmitter = require('events') instead
This compilation error because of versions conflicts of npm and node. I had the same issue in my project. I resolved after install the same compatible versions of npm and node as on another machine.
Check:
nmp -v
and
node -v.
All the confusion with the actual example is the first line of code.
var events = require('events');
After Node v6.1.0 this line of code will store EventEmmiter object inside events variable, so there is no need to access it explicitly later.
Solution is very simple, just change
events.EventEmitter.call(this);
to:
events.call(this)
And change
Account.prototype._proto_ = events.EventEmitter.prototype;
to:
Account.prototype._proto_ = events.prototype;
I had the same problem a few minutes ago, I decided to downgrade node to version 6.x, then it worked