Tips for effectively identifying and eliminating excessive and redundant javascript code within a chunk

https://i.sstatic.net/z7jQv.png

In my nextjs project, the main page is loading and I noticed that 98% of unused bytes are in one specific chunk of code.

As I delved into the code, I came across a red line highlighting this snippet:

"use strict";
eval(...)

I'm unsure about its significance. Could it be indicating that the unused code was imported and utilized somewhere?

I could really use your expertise and a keyword to help me unravel this mystery.

Answer №1

Running tests in a development environment may result in shipping unused JS code. To solve this issue, simply execute next build to create an optimized bundle.

If you're in production and want to determine why a package was imported, I recommend utilizing the bundle-analyzer.

Here are explanations for two common functions:

  • The eval() function evaluates JavaScript code from a string. source
  • "use strict"; specifies that JavaScript code should be executed in "strict mode." source

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