Why does headless need to be false for Puppeteer to work?

The reason it might work in UI mode but not headless is that sites who aggressively fight scraping will detect that you are running in a headless browser. Some possible workarounds: Use puppeteer-extra Found here: https://github.com/berstend/puppeteer-extra Check out their docs for how to use it. It has a couple plugins that might help in getting … Read more

You’re importing a component that needs useState. It only works in a Client Component, but none of its parents are marked with “use client”

In the app directory, by default, Next.js uses Server Components, where the JSX gets compiled to “pure HTML” and sent to the browser. Like any traditional Backend with a templating engine, such as Express with EJS, and Laravel with Blade. This is for better performance, as you can read on the doc: Server Components allow … Read more

How to do a wildcard element name match with “querySelector()” or “querySelectorAll()” in JavaScript?

[id^=’someId’] will match all ids starting with someId. [id$=’someId’] will match all ids ending with someId. [id*=’someId’] will match all ids containing someId. If you’re looking for the name attribute just substitute id with name. If you’re talking about the tag name of the element I don’t believe there is a way using querySelector

Promise.all is returning an array of undefined and resolves before being done

Promise.all accepts an Array of Promise objects. You’re getting an Array of undefined because you’re not returning any Promise in your map callback: function addText(queries) { return Promise.all(queries.map(function(query) { // Add `return` here or the `map` returns an Array of `undefined`. return models.queries .findById(query.queryId, { raw: true, attributes: [ “query” ] }) .then(function(queryFetched) { query.text … Read more

What are some use cases for SpreadsheetApp.flush()?

A programmer will use flush() when they want to ensure that the previous code’s output and/or effects are written to the spreadsheet before continuing. If you do not flush(), then the code may be automatically “optimized” by using some built-in caching and bundling of operations. In general, you do not need to use flush() until … Read more

Browser: Uncaught ReferenceError: require is not defined

This is because require() does not exist in the browser/client-side JavaScript. Now you’re going to have to make some choices about your client-side JavaScript script management. You have three options: Use the <script> tag. Use a CommonJS implementation. It has synchronous dependencies like Node.js Use an asynchronous module definition (AMD) implementation. CommonJS client side-implementations include … Read more

Why can’t I use a Javascript function before its definition inside a try block?

Firefox interprets function statements differently and apparently they broke declaration hoisting for the function declaration. ( A good read about named functions / declaration vs expression ) Why does Firefox interpret statements differently is because of the following code: if ( true ) { function test(){alert(“YAY”);} } else { function test(){alert(“FAIL”);} } test(); // should … Read more