Unexpectedly, optimization causing issues on Angular site without explanation

Currently, I am utilizing Angular to construct a front-end website that searches for and showcases information obtained through API requests. Whenever I compile the project into a file bundle for static deployment using ng build, I notice that the resulting bundle functions correctly only if I use the --optimization false option during compilation. Enabling optimization leads to various runtime errors when attempting to access the site.

The runtime errors seem erratic - making slight changes in my code results in entirely different errors being displayed when visiting the site. It is challenging to pinpoint the cause of the errors due to the minified object/function names and the fact that every error points back to this specific line in main.js:

platformBrowserDynamic().bootstrapModule(AppModule).catch(err => console.error(err));

Here are some examples of errors I have encountered – however, these errors tend to change whenever modifications are made to the code:

  • TypeError: rt is not a function
  • Cannot read properties of undefined (reading '3')
  • Uncaught TypeError: Class constructor xe cannot be invoked without 'new'
  • Uncaught (in promise) TypeError: He is not a function

Disabling optimization during the bundling process resolves all these issues, and the site runs smoothly without any errors. Nevertheless, I would prefer not to keep my site unoptimized permanently as the unoptimized bundle significantly increases the file size, and optimization likely brings other enhancements as well.

If you have any insights on why optimization might be causing disruptions on the site and how to prevent it from happening in the future, your assistance would be greatly valued.

Answer №1

Dealing with the optimization of my Angular app's production build presented me with a unique challenge. It was an interesting issue related to how I handled the built files, and it seems like you are facing similar challenges.

I encountered error messages that were sometimes nonsensical and seemed to change randomly. Upon investigation, I discovered that these errors were caused by mangled names used during the minification process carried out by ebuild. When debugging, I noticed that a function in my main.js file had the same name as a variable declared in polyfills.js, resulting in the latter being overwritten by the former.

Based on the error messages you shared, it appears that you may be experiencing conflicts due to mangled names, leading to unexpected behavior such as variables not having the expected types ('x is not a function', 'reading '3''). This could indicate instances where variables are being overwritten by other files.

In my situation, the root cause was how the built scripts were integrated into the index.html file. Instead of using the built index.html, I opted to generate FreeMarker templates (ftl files). The mistake I made was importing the main and polyfills scripts in my handwritten index.ftl incorrectly, which led to the issues I faced.

<script src="${script}" type="text/javascript"></script>

After making the necessary adjustments, everything functioned correctly. According to the JavaScript module documentation, true modules keep variables scoped within the module unless explicitly attached to the global object. Utilizing 'type="module"' prevented scope collisions and variable overwrites.

You may want to investigate potential conflicts between your JS files by debugging any errors and examining variable names across different files. Understanding why scopes are getting mixed up can help resolve your issues, even if your production build setup differs from mine.

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