mastodon/app/javascript/packs/public-path.js

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// Dynamically set webpack's loading path depending on a meta header, in order
// to share the same assets regardless of instance configuration.
// See https://webpack.js.org/guides/public-path/#on-the-fly
function removeOuterSlashes(string) {
return string.replace(/^\/*/, '').replace(/\/*$/, '');
}
function formatPublicPath(host = '', path = '') {
let formattedHost = removeOuterSlashes(host);
if (formattedHost && !/^http/i.test(formattedHost)) {
formattedHost = `//${formattedHost}`;
}
const formattedPath = removeOuterSlashes(path);
return `${formattedHost}/${formattedPath}/`;
}
const cdnHost = document.querySelector('meta[name=cdn-host]');
// eslint-disable-next-line no-undef
__webpack_public_path__ = formatPublicPath(cdnHost ? cdnHost.content : '', process.env.PUBLIC_OUTPUT_PATH);