What is the process for removing asserts in a release build?

Using a combination of babelify, watchify, envify, and uglify, I have set the node_env with the following command:

watchify ... -g [envify --NODE_ENV development]

This led me to consider creating an assert function like this:

import assert from 'assert';

function debug_assert(actual, expected, message = 'AssertionError'){
    if(process.env.NODE_ENV !== 'production'){
        assert.equal(actual, expected, message);
    }
}

It's interesting how uglify is able to remove the body of debug_assert but not calls to debug_assert in the code.

Is there a way to properly eliminate assert calls from the release build without adding too much extra code?

Answer №1

One possible solution is to utilize a tool like jsfmt and take advantage of its code rewriting functionality:

jsfmt --rewrite "assert.equal(a, b, c) -> ''" file.js

I have not personally verified it, but there is a chance that it will perform as expected. This command effectively replaces all instances of assert.equal with an empty string.

Answer №2

To effectively optimize your code, it is recommended to utilize a combination of different tools. As previously mentioned, the use of envify will alter

if(process.env.NODE_ENV !== 'production'){

to

if('production' !== 'production'){

This essentially means that the body of the if statement will never be executed.

In addition, incorporating uglifyify can further enhance optimization by performing dead code elimination and eliminating the if statement altogether.

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