An error has been encountered in Angular where a source map issue is causing a TypeError due to the

Whenever I work on an Angular project, the browser console usually remains error-free. However, when I opt to include 

projects > project-name > architect > build > options > "optimization": false
in the angular.json file to deactivate JavaScript minification, two errors pop up:

(1) Upon loading the app:

Source map error: Error: request failed with status 404
Resource URL: http://localhost:4200/main.js
Source Map URL: ngx-echarts.mjs.map

(2) When trying out the app's functionalities:

ERROR TypeError: ctx.formData is undefined
...
globalZoneAwareCallback http://localhost:4200/polyfills.js:12156

The problematic code appears to be:

var globalZoneAwareCallback = function (event) {
  return globalCallback(this, event, false);
}; // global shared zoneAwareCallback to handle all event callback with capture = true

...

In relation to error (1), even after ensuring that the source maps are enabled in my browser (Firefox) as suggested by one response, the issue persists. Despite having what seems like source maps activated, I am still encountering this error. How can I access the original non-minified version of the script?

Regarding error (2), the reason behind this specific error occurrence upon deactivating JavaScript minification eludes me. Why does this only happen in such a scenario?

javascriptangulartypescriptbundling-and-minificationpolyfills

Answer №1

  1. Code minification involves renaming variables and combining scripts to reduce file size. For example, consider the following code snippet:

    let a = 1
    b = a + 1

When this code is minified, all spaces and line breaks are removed, resulting in:

let a=1b=a+1

This can cause issues as it may not be valid JavaScript anymore, leading to errors that only occur with minified code.

  1. A source map helps link minified code back to its original source code, making debugging easier during development or when working with production code containing only minified files. While a source map won't fix errors, it facilitates reading the code for better understanding.

To identify and solve problems in your code, you'll need to utilize debugging techniques like setting breakpoints, tracing code execution, or using features like "pause on exception." If you're unfamiliar with these tools, learning how to debug JavaScript effectively is essential for troubleshooting your application.

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