Function inject

extensions/firefox/background.js:24–59

(id, files, type, callback)

let storage = chrome.storage.sync || chrome.storage.local;

function inject(id, files, type, callback) {
    let injector = INJECTORS[type];
    if (!injector) {
        return;
    }

    // inject code
    if (typeof files === 'string') {
        injector(id, {
            code: files
        }, callback);
        return;
    }

    // inject files
    let index = 0;
    let remaining = files.length;

    function injectNext() {
        if (remaining > 0) {
            injector(id, {
                file: files[index]
            }, () => {
                console.log('"' + files[index] + '" is injected.');
                index++;
                remaining--;
                injectNext();
            });
        } else {
            if (typeof callback === 'function') {
                callback();
            }
        }
    }
    injectNext();
}

function injectJS(id, content, callback) {
    inject(id, content, 'js', callback);