deepseek-ai/deepseek-harness · error · Error

fs-local: diffBasisMaxBytes must be a positive safe integer

Error message

fs-local: diffBasisMaxBytes must be a positive safe integer no greater than ${MAX_DIFF_BASIS_BYTES}

What it means

Error "fs-local: diffBasisMaxBytes must be a positive safe integer no greater than ${MAX_DIFF_BASIS_BYTES}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/fs/fs-local/src/index.ts:85

    diffBasisMaxBytes: z.number().default(DEFAULT_DIFF_BASIS_MAX_BYTES),
  })

  /** Validated config (schemastery applied the defaults before construction). */
  readonly config: ResolvedConfig
  /** Test hook forwarded to fsio for atomic-publication boundaries. */
  internals: FsIoInternals = {}
  /** Per-targetKey tail promise: serializes mutating ops so the read→guard→write
   * window can't interleave, making concurrent writes/edits deterministically
   * ordered (one wins, the rest see the new version and reject as stale). */
  private locks = new Map<string, Promise<unknown>>()

  constructor(ctx: Context, config: Config) {
    super(ctx)
    const resolved = config as ResolvedConfig
    if (!Number.isSafeInteger(resolved.diffBasisMaxBytes)
      || resolved.diffBasisMaxBytes <= 0
      || resolved.diffBasisMaxBytes > MAX_DIFF_BASIS_BYTES) {
      throw new Error(`fs-local: diffBasisMaxBytes must be a positive safe integer no greater than ${MAX_DIFF_BASIS_BYTES}`)
    }
    this.config = resolved
  }

  /** Run `op` with exclusive access to `targetKey` (FIFO per key). */
  private async withLock<T>(targetKey: string, op: () => Promise<T>): Promise<T> {
    const prior = this.locks.get(targetKey) ?? Promise.resolve()
    const run = prior.then(op, op)
    // Keep the chain alive but swallow this op's result/throw for the *next* waiter.
    const tail = run.then(() => undefined, () => undefined)
    this.locks.set(targetKey, tail)
    try {
      return await run
    } finally {
      if (this.locks.get(targetKey) === tail) {
        this.locks.delete(targetKey)
      }
    }

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/fs/fs-local/src/index.ts:85 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/407f0824ac298fe3. Report an issue: GitHub.