Safari Web Extensions and WebAssembly

We started using the new Safari Web Extension APIs and are extremely impressed so far. One thing I noticed right away after migrating our Web Extension to Safari is that it appears Safari 14 doesn’t allow us to instantiate WebAssembly without allowing unsafe-eval in our script-src CSP.

Google Chrome currently supports a wasm-eval CSP directive where Firefox doesn’t require any CSP change to use WebAssembly. Are there any plans for Safari to have a special directive, or do you have any pointers on using WebAssembly without also allowing unsafe-eval?

Thank you so much for adding the Web Extension APIs to Safari. This is extremely exciting for us at 1Password!

Accepted Answer

That is the current state of things with WASM. Currently wasm-eval is not standard, and only supported by Chrome. A WebKit bug report or feedback via Feedback Assistant is welcome. Using unsafe-eval is you best bet right now.

Thanks for the feedback and for trying out web extensions!

Answers

That is the current state of things with WASM. Currently wasm-eval is not standard, and only supported by Chrome. A WebKit bug report or feedback via Feedback Assistant is welcome. Using unsafe-eval is you best bet right now.

Thanks for the feedback and for trying out web extensions!