closure-compiler | A JavaScript checker and optimizer

shadow-cljs does not support CLJSJS packages. Instead you install the original npm packages those CLJSJS packages represent and use that directly.

So instead of

The React Native script bundler, Metro, first transpiles your code using Babel. In production build mode, it then runs your code through UglifyJS.

The default configuration doesn't do any advanced optimizations such as tree-shaking or deduping.

If you want to apply more advanced optimizations, you can try to see if they can be achieved during the transpilation step using Babel plugins. If not, it may be easiest to use Haul, a webpack-based alternative bundler for React Native.

However, as always, before optimizing prematurely, think about what metrics you are trying to improve and measure whether your optimizations actually achieve your goals.

According to the documentation for this service the file is retained for 1 hour:

For your convenience, the Closure Compiler service hosts the output file default.js on its servers for one hour. You can access the URL of the output file by copying the location of the link that's provided above the output pane, where it says The code may also be accessed at {filename}. If you make any changes to the original JavaScript code and re-optimize it during that hour, Closure Compiler service overwrites the output file with the new results as long as you leave the @output_file_name parameter unchanged at the top of the input field. You can use this feature as a quick way to test your compiled code by linking directly to the file from your test application. Do not link to it from production servers.

have u done npm install first?

maybe if u have installed all the necessary component i think u have to run with: npm run serve.dev or npm run test

You need to tell leiningen what namespace has your main function. In project.clj:

I got this answered via another question. But this turns out to be the reason why:

The cause is probably that the compiler doesn't see the function being called. Part of the advanced compilation is removing unused code and renaming the methods/variables.

Within your js or html it is never called because the function call is only defined in a string value here :

After going through the docs and carefully considering my setup, I have found the errors of my ways, and a satisfactory explanation for the results.

Since everything within the compiled code, including my @typedef, is subject to rewriting, what I actually needed was an extern to describe the shape of this externally provided object.

externs.js

Building from what you had, I've changed just a few things:

1) The src attribute is not a path it is the file: read the file in this case with fs.readFileSync.

2) The output is returned in the callback: you'll need to write it to the disk.

Files:

index.js