const modify = (buffer, props) => { // copy-webpack-plugin passes a buffer const manifest = JSON.parse(buffer.toString()); // make any modifications you like, such as Object.assign(manifest, props); // pretty print to JSON with two spaces return JSON.stringify(manifest, null, 2);};
...
{ from: path.resolve(__dirname, "src/manifest.json"), to: path.resolve(__dirname, "dist/manifest.json"), // eslint-disable-next-line no-shadow transform(content, path) { return modify(content, { name: config.title, // eslint-disable-next-line babel/camelcase short_name: config.shortName, orientation: config.orientation, version: config.version }); }