Provide esbuild-wasm build that does not require workers or dynamic code instantiation

[lucacasonato]

Currently when using esbuild-wasm you have two options:

• either you enable worker: true in the setup options, which means your environment requires support for web workers,
• or you don't enable workers, in which case the esbuild code will call new Function(...) with the code originally destined for the web worker

The latter case does not work on platforms like Deno Deploy or Cloudflare Workers, which limit dynamic JS evaluation for security/introspectability.

It would be great if the second option (not using a worker), did not require the use of dynamic code evaluation. Could the source code always be a "real" function in source, and then .toString()'d for the worker?

[lucacasonato]

Thanks a lot @evanw!