TS2345: Argument of type 'IFile' is not assignable to parameter of type 'string | Blob'.

[joegasewicz]

Error:

TS2345: Argument of type 'IFile' is not assignable to parameter of type 'string | Blob'.

Recreate error:

const teacher_img = getFileFromRef(teacherImgRef);
formData.append("teacher_img", teacher_img); // Error thrown here -> TS2345: Argument of type 'IFile' is not assignable to parameter of type 'string | Blob'.

Quick fix:

formData.append("teacher_img", teacher_img as any);