flow like the river

VISUALIZACION/node_modules/postcss/gulpfile.js

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+'use strict';
+
+const gulp = require('gulp');
+
+gulp.task('clean', () => {
+    let del = require('del');
+    return del(['lib/*.js', 'postcss.js', 'build/', 'api/']);
+});
+
+// Build
+
+gulp.task('compile', () => {
+    let sourcemaps = require('gulp-sourcemaps');
+    let changed    = require('gulp-changed');
+    let babel      = require('gulp-babel');
+    return gulp.src('lib/*.es6')
+        .pipe(changed('lib', { extension: '.js' }))
+        .pipe(sourcemaps.init())
+        .pipe(babel({
+            presets: [
+                [
+                    'env',
+                    {
+                        targets: {
+                            browsers: 'last 2 version',
+                            node: 4
+                        },
+                        loose: true
+                    }
+                ]
+            ],
+            plugins: ['add-module-exports', 'precompile-charcodes']
+        }))
+        .pipe(sourcemaps.write())
+        .pipe(gulp.dest('lib'));
+});
+
+gulp.task('build:lib', ['compile'], () => {
+    return gulp.src(['lib/*.js', 'lib/*.d.ts']).pipe(gulp.dest('build/lib'));
+});
+
+gulp.task('build:package', () => {
+    const editor = require('gulp-json-editor');
+    return gulp.src('./package.json')
+        .pipe(editor((json) => {
+            delete json.babel;
+            delete json.scripts;
+            delete json.jest;
+            delete json.eslintConfig;
+            delete json['size-limit'];
+            delete json['pre-commit'];
+            delete json['lint-staged'];
+            delete json.devDependencies;
+            return json;
+        }))
+        .pipe(gulp.dest('build'));
+});
+
+gulp.task('build:docs', () => {
+    let ignore = require('fs').readFileSync('.npmignore').toString()
+        .trim().split(/\n+/)
+        .concat([
+            'package.json', '.npmignore', 'lib/*', 'test/*',
+            'node_modules/**/*', 'docs/api.md', 'docs/plugins.md',
+            'docs/writing-a-plugin.md'
+        ]).map( i => '!' + i );
+    return gulp.src(['**/*'].concat(ignore))
+        .pipe(gulp.dest('build'));
+});
+
+gulp.task('build', done => {
+    let runSequence = require('run-sequence');
+    runSequence('clean', ['build:lib', 'build:docs', 'build:package'], done);
+});
+
+// Tests
+
+gulp.task('integration', ['build'], done => {
+    let postcss = require('./build');
+    let real    = require('postcss-parser-tests/real');
+    real(done, css => {
+        return postcss.parse(css).toResult({ map: { annotation: false } });
+    });
+});
+
+gulp.task('version', ['build:lib'], () => {
+    let Processor = require('./lib/processor');
+    let instance  = new Processor();
+    let pkg       = require('./package');
+    if ( pkg.version !== instance.version ) {
+        throw new Error('Version in Processor is not equal to package.json');
+    }
+});
+
+// Common
+
+gulp.task('default', ['version', 'integration']);