I don't understand the structure of most boilerplates out there. I always see 2 files named "index" (one js file and an other html file). I want to understand how the main entry point works. I often see web pack for this job but my main concern is, why do am I using an index.html file when I can (I guess) do all my work in js file?
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Well I structure my React apps like this:
index.js - calls ReactDOM.render() on app.jsx, which is the root React component.
bundle.js - This file is where index.js and all the JSX components are merged after being compiled into regular JavaScript using Webpack (hence bundle).
index.html - bundle.js is imported into the body of this html file through script tag, this is the entry point.

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okay, thanks! I got you – popo63301 May 29 '17 at 12:05
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Thank you! I've misunderstood some parts because I skipped the setup part of the tutorial. I had a tool generate the project for me without an index.js so there lies my problem – Bowiemtl Nov 02 '22 at 07:56