chrome_extension_vue_auth_token.js

// Scott C. Krause 👁️ neodigm | 2021
// Wait for Vue.js to mount and make VUEX auth token available to the chrome extension.

var _d = document, eScr = _d.createElement("script");
eScr.innerHTML = `
    setInterval(() => {
        var _d = document;
        if( !_d.querySelector("[data-ext-auth]")){
            var eV = _d.querySelector( 'DIV#app' );
            if( eV?.__vue__?.$store?.state?.auth?.token ){
                    eV.dataset.extAuth = eV.__vue__.$store.state.auth.token;
            }
        }           
    }, 6000);
    `;// Content Script | Run at end of doc | once
_d.head.appendChild( eScr ); 

JavaScript Nullish coalescing operator Chaining

"content_scripts": [ { "matches": [ "https://*/*", "http://*/*" ], "js": ["chrome_extension_vue_auth_token.js"], "run_at": "document_end" } ]