When code is transpiled and minified, it's possible to make changes to source code that have no effect on the bundled output. For example, if the minifier is removing comments, changing comments in the source code will have no effect on the output.
Conversely, there are cases where the source is unmodified, but the bundled output changes. For example, the transpiler or minifier may be updated to improve the output.
/* This code is copyright 2020 */ console.log('Yay');
Since minification removes comments, changing the comment to
2021 does not change the bundled output and should produce the same hashed URL.