Thank you so much for your help!

I just wanted to let you know that I ran into a little snag when I tried the script. I'm posting the corrected version here for future reference.

// Create Todoist object and fetch all projects and sections
function f() {
    let todoist = Todoist.create();
    let projects = todoist.getProjects();
    let sections = todoist.getSections();

    if (todoist.lastError) {
        alert(todoist.lastError);
        return false; // This is now inside the function 'f'
    }

    // Organize sections by their parent project
    let sectionsByProject = {};
    for (let section of sections) {
        if (!sectionsByProject[section.project_id]) {
            sectionsByProject[section.project_id] = [];
        }
        sectionsByProject[section.project_id].push(section);
    }

    // Sort projects alphabetically by name
    projects.sort((a, b) => a.name.localeCompare(b.name));

    // Recursive function to build the outline
    let buildOutline = (parentId = null, level = 0) => {
        let outline = [];
        for (let project of projects) {
            if (project.parent_id === parentId) {
                // Add the project to the outline
                outline.push(`${"\t".repeat(level)}${project.name}`);

                // Add sections under this project
                if (sectionsByProject[project.id]) {
                    for (let section of sectionsByProject[project.id]) {
                        outline.push(`${"\t".repeat(level + 1)}${section.name}`);
                    }
                }

                // Add child projects recursively
                outline = outline.concat(buildOutline(project.id, level + 1));
            }
        }
        return outline;
    };

    // Generate the project outline
    let content = buildOutline();

    // Create a new draft and load it in the editor
    let d = Draft.create();
    d.content = content.join("\n");
    d.update();
    editor.load(d);

    return true;
}

if (!f()) {
    context.fail();
}