hydrogen-web/scripts/build-plugins/manifest.js

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const fs = require('fs/promises');
const path = require('path');
module.exports = function injectWebManifest(manifestFile) {
let root;
let base;
let manifestHref;
return {
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name: "hydrogen:injectWebManifest",
apply: "build",
configResolved: config => {
root = config.root;
base = config.base;
},
transformIndexHtml: {
transform(html) {
return [{
tag: "link",
attrs: {rel: "manifest", href: manifestHref},
injectTo: "head"
}];
},
},
generateBundle: async function() {
const absoluteManifestFile = path.resolve(root, manifestFile);
const manifestDir = path.dirname(absoluteManifestFile);
const json = await fs.readFile(absoluteManifestFile, {encoding: "utf8"});
const manifest = JSON.parse(json);
for (const icon of manifest.icons) {
const iconFileName = path.resolve(manifestDir, icon.src);
const imgData = await fs.readFile(iconFileName);
const ref = this.emitFile({
type: "asset",
name: path.basename(iconFileName),
source: imgData
});
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// we take the basename as getFileName gives the filename
// relative to the output dir, but the manifest is an asset
// just like they icon, so we assume they end up in the same dir
icon.src = path.basename(this.getFileName(ref));
}
const outputName = path.basename(absoluteManifestFile);
const manifestRef = this.emitFile({
type: "asset",
name: outputName,
source: JSON.stringify(manifest)
});
manifestHref = base + this.getFileName(manifestRef);
}
};
}