RocketChat/Rocket.Chat

export const readFileAsDataURL = (file: File) =>
    new Promise<string>((resolve, reject) => {
        const reader = new FileReader();
        reader.onloadend = (event) => {
            const result = event.target?.result;
            if (typeof result === 'string') {
                resolve(result);
                return;
            }
            reject(new Error('Failed to read file'));
        };
        reader.onerror = (event) => {
            reject(new Error(`Failed to read file: ${event}`));
        };
        reader.readAsDataURL(file);
    });