HckApm/node_modules/get-nonce

get-nonce

just returns a nonce (number used once). No batteries included in those 46 bytes of this library.

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• ✅ build in webpack support via __webpack_nonce__

API

• getNonce(): string|undefined - returns the current nonce
• setNonce(newValue) - set's nonce value

Why?

Why we need a library to access __webpack_nonce__? Abstractions!

"I", as a library author, don't want to "predict" the platform "you" going to use. "I", as well, want an easier way to test and control nonce value.

Like - nonce is supported out of the box only by webpack, what you are going to do?

This is why this "man-in-the-middle" was created. Yep, think about left-pad :)

Webpack

https://webpack.js.org/guides/csp/

To activate the feature set a webpack_nonce variable needs to be included in your entry script.

__webpack_nonce__ = uuid(); // for example

Without webpack __webpack_nonce__ is actually just a global variable, which makes it actually bundler independent, however "other bundlers" are able to replicate it only setting it as a global variable (as here in tests) which violates a "secure" nature of nonce.

get-nonce is not global.

Used in

• react-style-singleton <- react-remove-scroll <- react-focus-on

Inspiration

• this issue
• styled-components

Licence

MIT