magento2.2 – The main file js of Magento 2 does not work

I want to replace a main js file, but everything I tried failed, including the copy of the method used by another crushed primary file that works. Here's what i have in my requirejs.config.js right now:

var config = {
map: {
"*": {
& # 39; Magento_Checkout / js / view / minicart: js / view / minicart, // This one is replaced correctly
& # 39; Magento_Checkout / js / action / place-order: js / action / place-order & # 39; // This one will not replace
}
}
};

Here are the paths to the two files that will not be replaced:

basic file: provider / magento / module-checkout / view / frontend / web / js / action / place-order.js

replace the file: app / design / frontend / MyNamespace / mymodule / Magento_Checkout / web / js / action / place-order.js

And for reference, here are the paths of the one who is crushed:

basic file: provider / magento / module-checkout / view / frontend / web / js / view / minicart.js

replace the file:

app / design / frontend / MyNamespace / mymodule / Magento_Checkout / web / js / view / minicart.js

I am also using Magento 2.2.6.

I've flushed the cache multiple times and, as I'm in a development environment, I do not need to deploy static content, but I still tried it, it still did not work not. I can not understand why one would replace the other.

Any help is appreciated.