gulp-polymer-build

gulp-polymer-build
=========================

Use this gulp plugin to easily extend the polymer-cli build command.
This will still use your build configs from your polymer.json, so setup
is quick and easy.

The createBuildStreams function returns a promise that resolves to a
javascript object for each build, with the key being the build name and
the value a vinyl stream that can be piped using gulp.

You can override the source stream by supplying source in the
opts argument. By default, polymerProject.sources() is used.

Basic Example

``javascript
'use strict';

const del = require('del');
const path = require('path');
const gulp = require('gulp');
const polymerBuild = require('polymer-build');
const configBuild = require('gulp-polymer-build');
const buildDirectory = 'build';

// promise that waits for stream to end
function waitFor(stream) {
return new Promise((resolve, reject) => {
stream.on('end', resolve);
stream.on('error', reject);
});
}

// get a PolymerProject object based on your polymer.json
const polymerProject = new polymerBuild.PolymerProject(require('./polymer.json'));

gulp.task('build', () => {
console.log(Deleting ${buildDirectory} directory...);
del.sync([buildDirectory]);
return configBuild.createBuildStreams(polymerProject).then(builds => {
let promises = [];

for (let name in builds) {
let dir = path.join(buildDirectory, name);
builds[name].pipe(gulp.dest(dir));
// more post-processing pipes can be added here

promises.push(waitFor(builds[name]));
}

// ensure gulp waits for all streams to end
return Promise.all(promises);
});
});
`

Overriding the sources stream


`javascript
const opts = {};
opts.sources = polymerProject.sources()
.pipe(myCustomPipe);
const builds = configBuild.createBuildStreams(polymerProject, opts);
``