WeakMap polyfill causing Content Security Policy errors

[jvanoostveen]

As the WeakMap polyfill is imported, it will trigger a CSP error (see the following snippet) as it uses eval.

EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self'".

    at eval (<anonymous>)
    at Object../node_modules/weakmap/weakmap.js (weakmap.js:240)