deepseek-ai/deepseek-harness · error · TypeError

settings ${verb} for "${ns}" must contain only JSON-compatib

Error message

settings ${verb} for "${ns}" must contain only JSON-compatible data (found a non-finite number at ${path})

What it means

Error "settings ${verb} for "${ns}" must contain only JSON-compatible data (found a non-finite number at ${path})" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/settings/settings/src/index.ts:261

 * only JSON data (plain objects, arrays, strings, finite numbers,
 * booleans, `null`) may reach a provider document. `structuredClone` alone
 * would admit Dates, Maps, BigInts, and cycles that YAML/JSON storage then
 * silently distorts on the reload round-trip. `undefined` entries in objects
 * are skipped — the same sparse-patch semantics as {@link mergeLayers} — while
 * an `undefined` array entry is rejected rather than coerced.
 * @param root - plain-object write input (caller-checked).
 * @param reject - builds the validation error from a value label and its `$`-rooted path.
 * @returns the detached JSON-compatible clone.
 */
function cloneJsonShaped(
  root: Record<string, unknown>,
  reject: (label: string, path: string) => TypeError,
): Record<string, unknown> {
  const visiting = new WeakSet<object>()
  const clone = (value: unknown, path: string): unknown => {
    if (value === null || typeof value === 'string' || typeof value === 'boolean') return value
    if (typeof value === 'number') {
      if (!Number.isFinite(value)) throw reject('a non-finite number', path)
      return value
    }
    if (Array.isArray(value)) {
      if (visiting.has(value)) throw reject('a circular reference', path)
      visiting.add(value)
      const entries = value.map((entry, index) => clone(entry, `${path}[${index}]`))
      // Un-mark on exit so one object referenced twice without a cycle passes.
      visiting.delete(value)
      return entries
    }
    if (isPlainObject(value)) {
      if (visiting.has(value)) throw reject('a circular reference', path)
      visiting.add(value)
      // TODO(settings-json-properties): Use property-safe construction here and
      // in mergeLayers so valid JSON keys such as "__proto__" remain own data.
      const out: Record<string, unknown> = {}
      for (const [key, entry] of Object.entries(value)) {
        if (entry === undefined) continue

View on GitHub (pinned to b150a551b8)

Solutions

1. Replace NaN or Infinity with finite numbers or null before writing settings.

When it happens

Trigger: Thrown at packages/settings/settings/src/index.ts:261 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/8f479235534534d4. Report an issue: GitHub.