I am using the optional chaining operator in my application, for instance: (checks if optionalField exists, then do something with it) The above code works perfectly on my machine but it gives me an error when I try to build this code on Heroku. Here is what the logs say: Does anyone know why is that? I suspe…
Tag: node.js
Javascript function and expression function
This tiny Javascript program returns the sha256 hash of its text. Executed with Nodejs Erbium, it works as expected. However, after writing it I thought that the function expression was not needed and so I changed the data line with the following: stream.on(‘data’, shasum.update); And it crashes w…
Client.roles.cache.size => undefined | Discord.js v12 [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question client.roles.cache.size doesn’t seem to work for me in v12, just says that cache is un…
webpack is not running after starting separate expressJS service
For some reason I do not see webpack being kicked off. My script stops right after yarn start and never runs webpack-dev-server –watch –env=dev –open part of it in my dev script. I suppose that’s because the node service doesn’t exit and continues to run so I never get a completi…
Express POST API Route not receiving a Supertest request
I am trying to test an Express API POST Route that uses Express Validator for check: This API route expects to receive a request consisting of a body that contains the fields, name, email, and password: In order to test this route, I have a test file using supertest and jest: When I execute this test, each ch…
Drawing a line that’s always as wide as its parent BoxElement?
I’m using a BoxElement from blessed to display a chat history. Sentences are added using pushLine. For clarity, days are divided by lines (another string added using pushLine). Each line is as wide as the parent BoxElement. If the TUI is resized however, the line no longer fits. I have 2 questions: How …
API called twice while useEffect triggered once. ReactJS/Javascript
i am building a project, in which when user click the buyNow button in Basket (child 2) it will pass the props back to parent where it further pass it to another child in Signin(child 3) where we call an API call(inside useEffect) to update the mysql database but it seems that the API call is called twice as …
Evaluate Value at Each Step of a Chained Promise and Break Out of Promise
I have the following chained promise. At each step, I need to evaluate if the returned value is not null. I can add an if else condition at each step, but I was wondering if there is a more concise way of doing this. Also, how can I break out of the chain if the value is null at any
how do you install and run puppeteer for firefox
Hi I am doing some web automation. I am trying to open a url and I am getting a data URL error in chrome console so I am moving to firefox console to get around the no data urls opening in the chrome console issue. The problem is “npm install puppeteer-firefox” is not working to install puppeteer …
UnhandledPromiseRejectionWarning : error handling in an async callback function
I have an async callback function, which throws an error if some condition isn’t met. but I get the below error (node:77284) UnhandledPromiseRejectionWarning: Error: Not Found UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async funct…