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serviceWorker.js
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serviceWorker.js
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const workboxBuild = require("workbox-build");
const uglifyJS = require("uglify-js");
const logger = require("parcel-bundler/src/Logger");
const { readFile, writeFileSync } = require("fs");
const {
workboxTask,
useMinifyDefault,
defaultEncoding,
chars
} = require("./constants");
const formatBytes = require("./formatBytes.js");
const getWorker = (options, minify = useMinifyDefault) => {
const task = workboxTask(options);
let swData = {
count: 0,
size: 0,
warnings: []
};
return workboxBuild[task](options)
.then(data => {
if (typeof data === "object") {
swData = data;
return data;
}
})
.then(src => {
return typeof src !== "object" && typeof src !== "undefined"
? `${src}`
: Promise.resolve(
new Promise((resolve, reject) =>
readFile(
options.swDest,
defaultEncoding,
(err, data) => (err ? reject(err) : resolve(data))
)
)
);
})
.then(swString => {
logger.status(chars.success, "Service worker generated");
return swString;
})
.then(swString => {
let minified = swString;
if (minify) {
minified = uglifyJS.minify(minified).code;
logger.status(chars.success, "Service worker minified");
}
return minified;
})
.then(swString => {
writeFileSync(options.swDest, swString);
logger.status(chars.success, `Workbox finished : ${options.swDest}`);
})
.then(() => {
let { size } = swData;
size = formatBytes(size);
logger.status(
chars.link,
`${swData.count} files will be precached, totalling ${size}.`
);
})
.catch(err => {
logger.status(chars.error, `Workbox failed : ${err}`);
});
};
module.exports = getWorker;