gulp-until

This package evaluates a function until it returns true to go to the next pipe.

A true-ish return value like 1 or {} would not trigger the next pipe.
The function has to explicitly return true or false.

Installation

$ npm install gulp-until --save-dev

$ yarn add gulp-until --dev

Example Usage

Either pass a function directly:

  import until from 'gulp-until';
 
  return gulp.src(config.src)
    .pipe(until(() => {
      // Once this function returns true for the first time,
      // the next pipe is executed.
    }))
    .pipe(gulp.dest(config.dest));

The example above uses the ES6 syntax.

Or additionally give gulp-util a custom time to wait between checks.
Default: 100

  var until = require('gulp-until');
 
  return gulp.src(config.src)
    .pipe(until({
      wait: 800, // ms to wait between checks.
      check: function() {
        // Again the evaluation function.
      }
    }))
    .pipe(gulp.dest(config.dest));