async arrayBuffer() {
        const data = await fs.promises.readFile(this.filePath);
        return /** @type {ArrayBuffer} */ (data.buffer);
    }
Reads the contents of the file specified by the filePath property and returns a Promise that
resolves with an ArrayBuffer containing the file's contents.
@returns {Promise<ArrayBuffer>} A Promise that resolves with an ArrayBuffer containing the file's contents.
@throws {Error} If the file cannot be read.