gulp-function/README.md

gulp-function

accepts a function call as parameter to execute in gulp pipeline

Availabililty

Status for master

Usage

import gulp = require('gulp');
import gulpFunction from 'gulp-function'; // default ES6 export
// import {forFirst, forEach, atEnd} from 'gulp-function'

let myAsyncFunction = async (file, enc) => {
  // await some async stuff
};

gulp.task('gulpTest', function() {
  let stream = gulp
    .src('./mydir/*.something')
    .pipe(gulpFunction(myAsyncFunction, 'forEach')) //read the notes below
    // .pipe(forEach(myAsyncFunction)) // if imported as >> import { forEach } from 'gulp-function' <<
    .pipe(gulp.dest('./build/'));
  return stream; // by returning the stream gulp knows when our task has finished.
});

Notes

• The first argument of gulpFunction can also be an array of multiple functionnames. Each function can return a promise. The pipe stop will finish when every promise is fullfilled. When providing an array of functions be careful with modifying the file object -> race condition
• The second argument can be empty, it defaults to "forEach"
• The following options are available:
  • "forFirst" - executes when first chunk/vinylfile of the stream reaches the pipestop. file is pushed further down the line when function's returned promise is fullfilled.
  • "forEach" - executes like "forFirst" but with every chunk/vinylfile in the stream;
  • "atEnd" - executes after all chunks have passed and are processed in full. That means the stream's "finish" event fires before "atLast" is executed!!!

For further information read the linked docs at the top of this README.

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