use strict

[jcbhmr]

Description

adds this to the top of each js file template:

"use strict";

Context

commonjs modules are NOT in strict mode by default. they need a "use strict" directive just like <script> non-type=module tags do.

it would be a good idea to add "use strict" to this code to catch assigning undeclared globals, catch writing to non-writable properties, etc.
more info https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode

Checklist

• Is this a user-facing change? If so, update CHANGELOG.md
• Does this include an architectural decision? If so, add a quick Architectural Decision Record
  ☝ i dont know if i need to do these? idk. 🆘