[ Documentation request ] Dev guide > TS > writing helper functions

[lorensr]

Brief description

There are various issues related to how to share functions between bundled workflow code and activity code.

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One example is how to log from such functions.

I have a number of modules that I want to use inside and outside a workflow. I would like these modules to use the logger sink when inside a workflow context, but use its current logger implementation when outside a workflow (without changing all these source files).

import myLogger from '~/myLogger';

// I wanna use this function in both contexts and have it "just work"
function thisIsPureExceptForTheLoggerStatement() {
  // ...
  myLogger.log(`Some debug information`);
  // ...
}

Answer: ignore the real logger module in the bundleOptions, something like this (untested):

// myLogger.js

import { inWorkflowContext } from '@temporalio/workflow';
import nonWorkflowLogger from './myRealLogger';

const logger = inWorkflowContext() ? proxySinks().logger : nonWorkflowLogger;
export default logger;

// worker.js

await Worker.create({
  bundlerOptions: { ignoreModules: ['./myRealLogger'] },
  ...
})

[flossypurse]

@lorensr since we have this sample https://github.com/temporalio/samples-typescript/pull/228 Can we close this issue?

[lorensr]

I think it would be helpful to have a dev guide section on it, as it's a common enough issue and many won't find it in the samples.