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Last active Nov 12, 2017

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OpenLayers, Rollup, and Closure Compiler
/node_modules/
bundle.js

OpenLayers, Rollup, and Closure Compiler

This example demonstrates how the ol@beta package can be used with Rollup and the Closure Compiler in advanced mode.

Note that the Compiler takes a while to run.

Clone the project.

git clone git@gist.github.com:32a5692bedac5254da24fa3b12072f35.git ol-rollup-closure

Install the project dependencies.

cd ol-rollup-closure
npm install

Create a bundle for the browser.

npm run build

Open index.html to see the result.

open index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Using OpenLayers with Rollup and the Closure Compiler</title>
<link rel="stylesheet" href="https://openlayers.org/en/latest/css/ol.css" type="text/css">
<style>
html, body {
margin: 0;
height: 100%;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script src="./bundle.js"></script>
</body>
</html>
import Map from 'ol/map';
import View from 'ol/view';
import TileLayer from 'ol/layer/tile';
import XYZ from 'ol/source/xyz';
new Map({
target: 'map',
layers: [
new TileLayer({
source: new XYZ({
url: 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png'
})
})
],
view: new View({
center: [0, 0],
zoom: 2
})
});
{
"name": "ol-rollup-closure",
"version": "1.0.0",
"description": "Example using OpenLayers with Rollup and Closure Compiler",
"scripts": {
"build": "rollup --config rollup.config.js"
},
"devDependencies": {
"rollup": "^0.51.3",
"rollup-plugin-closure-compiler-js": "^1.0.5",
"rollup-plugin-commonjs": "^8.2.6",
"rollup-plugin-node-resolve": "^3.0.0"
},
"dependencies": {
"ol": "^4.1.0"
}
}
import closure from 'rollup-plugin-closure-compiler-js';
import common from 'rollup-plugin-commonjs';
import node from 'rollup-plugin-node-resolve';
module.exports = {
input: 'main.js',
output: [
{file: 'bundle.js', format: 'es'}
],
plugins: [
node(),
common(),
closure({
compilationLevel: 'ADVANCED',
warningLevel: 'QUIET'
})
]
};
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