TypeError: Cannot read properties of undefined (reading 'FS')

[joisun]

define function:

export const execute = async (file: string, commandParts: CommandPartsType) => {
    // const blob = await readFile(file);
    // if (!blob) return;

    const ffmpeg = new FFmpeg();

    // write to file system
    await ffmpeg.writeFile(commandParts.input, file);

    // convert mp4 to avi
    await ffmpeg.exec(commandParts.executeParts);

    // read from file system
    const result: Uint8Array = ffmpeg.readFile(commandParts.output);

    downloadData(result, commandParts.output)

    // free memory
    ffmpeg.deleteFile(commandParts.input);
    ffmpeg.deleteFile(commandParts.output);
    // const result: Uint8Array = ffmpeg.exec(commandParts).export()

    //   const result: Uint8Array | undefined = await ffmpeg
    //     .input({ source: blob })
    //     .ouput({ format: 'avi' })
    //     .export()
}

usage:

// export type CommandPartsType = {
//  input: string
//  output: string
//  executeParts: string[]
// }

// files[0]: URL.createObjectURL(file)

    await execute(files[0], commandParts)

error:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'FS')
    at O.writeFile (@diffusion-studio_ffmpeg-js.js?v=77f8ebdb:217:52)
    at async execute (ffmpeg-js.ts?t=1721995298380:24:3)
    at async onSubmit (VideoToX.tsx?t=1721995362784:98:5)
    at async chunk-Q3LFL7AZ.js?v=77f8ebdb:1637:9