@benev/slate/x/base/addons/attributes.js

frontend web stuff

export function attributes(element, spec) {
    Attributes.on_change(element, () => element.requestUpdate());
    return Attributes.proxy(element, spec);
}
export var Attributes;
(function (Attributes) {
    Attributes.proxy = (element, spec) => new Proxy(spec, {
        get: (_target, name) => {
            const type = spec[name];
            const raw = element.getAttribute(name);
            switch (type) {
                case String:
                    return raw ?? undefined;
                case Number:
                    return raw !== null
                        ? Number(raw)
                        : undefined;
                case Boolean:
                    return raw !== null;
                default:
                    throw new Error(`invalid attribute type for "${name}"`);
            }
        },
        set: (_target, name, value) => {
            const type = spec[name];
            switch (type) {
                case String: {
                    element.setAttribute(name, value);
                    return true;
                }
                case Number: {
                    element.setAttribute(name, value.toString());
                    return true;
                }
                case Boolean: {
                    if (value)
                        element.setAttribute(name, "");
                    else
                        element.removeAttribute(name);
                    return true;
                }
                default:
                    throw new Error(`invalid attribute type for "${name}"`);
            }
        },
    });
    function on_change(element, handle_change) {
        const observer = new MutationObserver(handle_change);
        observer.observe(element, { attributes: true });
        return () => observer.disconnect();
    }
    Attributes.on_change = on_change;
})(Attributes || (Attributes = {}));
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