gulp-errorable

A module providing a custom registry which decorates gulp tasks, to provide the ability to execute error logging functionality in the event that an error occurs. I made this because I wanted to have my verification script, which is basically a local version of my CI script, send me slack messages. However, the time involved in sending the slack message, over the network, meant that gulp terminated the slack messaging function before it could send.

This decorator-based approach allows gulp to wait until a long-running function is finished executing before it terminates. In essence, it allows me to send my slack messages. However, it can really do anything that is needed if an error is found.

Usage Instructions

Import the library and tell gulp to use its registry.

The function to be executed if an error is found, will be awaited, thus it should return a Promise.

import { ErrorableRegistry } from 'gulp-errorable';

const myErrorLoggingFunction = () =>
  new Promise((resolve, _reject) => {
    console.warn('we found an error!');
    resolve();
  });

gulp.registry(new ErrorableRegistry(myErrorLoggingFunction));

Task example:

const lint = seriesPromise({
  name: 'lint',
  tasks: [_lintTs, _checkTypes],
});

const verify = seriesPromise({
  name: 'verify',
  tasks: [
    _registerSlackNotify,
    _gitStatusHumanReview,
    lint,
    test,
    _slackNotify,
  ],
});

export { lint, test };

This is essentially the same way that gulp is normally used.

API

ErrorableRegistry(errorHandlingFunction)

• ErrorableRegistry(errorHandlingFunction: ErrorHandlingFunction)
  
  // where the type of ErrorHandlingFunction is:
  type ErrorHandlingFunction = () => Promise<any>;

  This is the main custom gulp registry which allows you to provide a function to decorate your tasks, in other words it allows you to do something specific if an error is found in a task. Essentially, you can use this function to do something like make a network request or write to a log file or whatever.

seriesPromise(options)

• seriesPromise(options:{
    name?: string;
    tasks: Task[];
  })

  Will create a task that wraps series it is essentially equivalent to something like:

  const exampleTask = series(task1, task1);

  The name is optional, but if it is not provided it will be <anonymous>, see Caveats.

seriesPromise(options)

• parallelPromise(options:{
    name?: string;
    tasks: Task[];
  })

  Will create a task that wraps parallel it is essentially equivalent to something like:

  const exampleTask = parallel(task1, task1);

  The name is optional, but if it is not provided it will be <anonymous>, see Caveats.

Caveats

All tasks must use the gulp Promise-based completion method. This is just a simplifying assumption made, due to the limited amount of safe information given to the module by gulp. To help facilitate this the gulp-errorable provides several wrappers around series and parallel. These essentially "promisify" each of these functions respectively.

Due to this, the names of the tasks using these will not be very friendly, specifically: they will be <anonymous>. However, a name can be provided which fixes this problem, this is optional, and the <anonymous> name can be used if desired, for some reason.

License

MIT Copyright (c) David Piper