TextEncode t is undefined

[bogocodes]

When I try to send a message it says t is undefined code looks like this:
if (this.upload.segment === 'file') { content = addPrefix(await fileToArrayBuffer(this.upload.file), this.upload.file.name) contentType = this.upload.file.type } else { const t = new TextEncoder() content = addPrefix(t.encode(this.upload.message), '') contentType = 'text/plain' }