Function emitError

host/dom/src/index.js:17–25

(where, e)

    let errorMsg = null;
    // Surfaces async errors (listener throws, observer callbacks, swallowed promise rejections) to Python. Falls back to console.error if no consumer bound via bind_global_error.
    const emitError = (where, e) => {
        if (errorMsg) ctx.pushEvent(JSON.stringify({
            msg: errorMsg,
            where,
            error: (e && e.message) ? e.message : String(e),
            stack: (e && e.stack) ? e.stack : undefined,
        }));
        else console.error(`[dom:${where}]`, e);
    };
    const ctxPlus = { ...ctx, emitError };
    return Object.assign(
        {},