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react-webpack-debug

Repo to debug different behaviours between Webpack 4 & Webpack 5

Using the same react component we get different experiences when building with Webpack 4 & Webpack 5 on iOS

Steps to reproduce

  1. Install the desired Webpack version using the commands below
  2. Run npm run start
  3. Using Xcode Simulator open an iPhone (I've been testing with iPhone 15 running iOS 17.0) or open on real iPhone device or using Safari on Desktop
  4. Navigate to http://localhost:8080
  5. Click on the button

To test with Webpack 4

cat webpack4-package.json > package.json && npm install

To test with Webpack 5

cat webpack5-package.json > package.json && npm install

Expectation

Clicking the button would open a new tab when building with Webpack 4 & Webpack 5 on iOS.

Reality

Clicking the button would open a new tab when building with Webpack 4 only. When building with Webpack 5 the new tab does not open. The popup gets blocked.

Note: Running the same code on Chrome/Firefox Desktop works as expected on both Webpack 4 & Webpack 5.

Running with Webpack 4

webpack4.mov

Running with Webpack 5

webpack5.mov