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package io.konform.validation

import com.quickbirdstudios.nonEmptyCollection.list.NonEmptyList
import com.quickbirdstudios.nonEmptyCollection.unsafe.toNonEmptyList
import kotlin.reflect.KProperty1

class Validation<T, E>(private val block: ValidationBuilder<T, E>.(T) -> Unit) : Validator<T, E> {
    override operator fun invoke(
        value: T,
        builder: ValidationBuilder<T, E>

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#Error management in gulp

Sucking at something is the first step to becoming sorta good at something

No one can assure you, that plugins will run smooth in any circumstances (except for tests - they could), so neither should you convince anyone, that your plugin will never break. Only thing, that you could possibly do (if something gone wrong) - is gracefully inform your plugin user, that something went wrong and die.

We are will use this plugin from beginning to demonstrate error management. Suppose you have a task in gulpfile.js that contains this code (we modified it a little bit to be closer to real-usage):

var coffee = require('gulp-coffee');

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// npm i gulp event-stream

var gulp = require('gulp');
var es = require('event-stream');

gulp.task('test', function(cb) {
    return es.concat(
        gulp.src('bootstrap/js/*.js')
            .pipe(gulp.dest('public/bootstrap')),
        gulp.src('jquery.cookie/jquery.cookie.js')

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// npm i gulp gulp-watch gulp-mocha gulp-batch

var gulp = require('gulp');
var mocha = require('gulp-mocha');
var batch = require('gulp-batch');

gulp.watch(['test/**', 'lib/**'], batch(function (events, cb) {
    return gulp.src(['test/*.js'])
        .pipe(mocha({ reporter: 'list' }))
        .on('error', function (err) {

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In file included from /Users/floatdrop/xtensor-benchmark/src/main.cpp:13:
/Users/floatdrop/xtensor-benchmark/src/benchmark_1D.hpp:61:46: error: no member named 'raw_data' in 'xt::xtensor_container<xt::uvector<double,
      xsimd::aligned_allocator<double, 32> >, 1, xt::layout_type::row_major, xt::xtensor_expression_tag>'
                benchmark::DoNotOptimize(res.raw_data());
                                         ~~~ ^
In file included from /Users/floatdrop/xtensor-benchmark/src/main.cpp:14:
/Users/floatdrop/xtensor-benchmark/src/benchmark_2D.hpp:56:42: error: no member named 'raw_data' in 'xt::xtensor_container<xt::uvector<double,
      xsimd::aligned_allocator<double, 32> >, 2, xt::layout_type::row_major, xt::xtensor_expression_tag>'
            benchmark::DoNotOptimize(res.raw_data());
                                     ~~~ ^

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var onError = function (err) {  
  gutil.beep();
  console.log(err);
};

gulp.task('styles', function () {  
  gulp.src('scss/style.scss')
    .pipe(plumber(onError)
    .pipe(rubysass())
    .pipe(gulp.dest('dist/'));

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var gulp = require('gulp');
var browserify = require('gulp-browserify');
var less = require('gulp-less');
var concat = require('gulp-concat');
var jshint = require('gulp-jshint');
var watch = require('gulp-watch');

var outDir = './temp';

var isWatch = false;

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'use strict';

var gulp = require('gulp'),
    gutil = require('gulp-util'),
    tslint = require('gulp-tslint'),
    typescript = require('gulp-tsc'),
    watch = require('gulp-watch'),
    plumber = require('gulp-plumber'),
    //livereloadEmbed = require('gulp-embedlr'),

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gulp.src('...')
    .pipe(_if(expression, damn().many().piped().actions().to().do().and().there().is().more().to().come().after().you().gone().a().sleep(), true)

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var watch = require('../gulp-watch');
var gulp = require('gulp');
var debug = require('gulp-debug');
var eslint = require('gulp-eslint');
var esformatter = require('gulp-esformatter');
var eslintStylish = require('eslint-stylish');

gulp.task('default', function() {
  gulp.src('./src/**/*.js')
    .pipe(watch(function(files) {