Build compiler Esbuild support

[edgehero]

Investigative information

• azure/functions Version: 4.4.0

Currently this libary got a problem, and that is that it can not be compiled with builders like esbuild/babel/webkit.

Example:
`
$ esbuild ./src/functions/example/index.js --bundle --platform=node --target=node20.12.2 --outfile=.build/index.js

X [ERROR] Could not resolve "@azure/functions-core"

../../node_modules/@azure/functions/dist/azure-functions.js:2544:25:
  2544 │ module.exports = require("@azure/functions-core");
       ╵                          ~~~~~~~~~~~~~~~~~~~~~~~

You can mark the path "@azure/functions-core" as external to exclude it from the bundle, which
will remove this error and leave the unresolved path in the bundle. You can also surround this
"require" call with a try/catch block to handle this failure at run-time instead of bundle-time.
`
Why do we even need a compiler?

Monorepo's got alot of libaries ( Terrabytes ), 99,99% of those have noting to do with the function.
A compiler is normally a way to solve this problem.
So running a compiler like esbuild on the js with the function, results in a js file, with the libaries that it needs in the Javascript file, and only those it needs to run in the function. it will result in a js file that is just a few Kb's.

Known workarounds

There is a workaround for the compiler to add "@azure/functions-core" as external libary.
It will compile without the "@azure/functions-core" libary then.
This will result in a successful compile.

but when deploying it to azure it will not show the functions.
So the "@azure/functions-core" is a important script that needs to be included if you want the script to work on azure functions.

[ejizba]

but when deploying it to azure it will not show the functions.

Can you expand on this? For example, you could provide a sample app that hits this problem, or follow these instructions to share your app name and time of issue.

So the "@azure/functions-core" is a important script that needs to be included if you want the script to work on azure functions.

This is not true, I believe you're running into some other problem that we need to figure out. You should be listing "@azure/functions-core" as an external library

[microsoft-github-policy-service]

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