deepseek-ai/deepseek-harness · error · Error

subprocess-e2b: invalid base64 output transport

Error message

subprocess-e2b: invalid base64 output transport

What it means

Error "subprocess-e2b: invalid base64 output transport" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/e2b/subprocess-e2b/src/output.ts:37

   * @returns the complete raw bytes made available by this callback.
   */
  push(text: string): Buffer {
    if (text.length === 0) return Buffer.alloc(0)
    this.pending += text
    const decoded: Buffer[] = []
    for (;;) {
      const boundary = this.pending.indexOf('\n')
      if (boundary < 0) break
      const frame = this.pending.slice(0, boundary)
      this.pending = this.pending.slice(boundary + 1)
      if (frame === E2B_OUTPUT_COMPLETE_FRAME) {
        if (this.complete) throw new Error('subprocess-e2b: duplicate output transport completion')
        this.complete = true
        continue
      }
      if (this.complete) throw new Error('subprocess-e2b: output transport continued after completion')
      if (!BASE64_TEXT.test(frame)) {
        throw new Error('subprocess-e2b: invalid base64 output transport')
      }
      const bytes = Buffer.from(frame, 'base64')
      if (bytes.toString('base64') !== frame) {
        throw new Error('subprocess-e2b: invalid base64 output transport')
      }
      decoded.push(bytes)
    }
    return Buffer.concat(decoded)
  }

  /**
   * Validate clean encoder completion, or discard an interrupted trailing frame after requested termination.
   * @param requireComplete - Whether natural completion requires the reserved EOF frame.
   */
  finish(requireComplete = true): void {
    if (!requireComplete) {
      this.pending = ''
      return

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/e2b/subprocess-e2b/src/output.ts:37 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/8c59a07439cbfd7e. Report an issue: GitHub.