deepseek-ai/deepseek-harness · error

typert: ${subject} strict codec has no parse() method

Error message

typert: ${subject} strict codec has no parse() method

What it means

Error "typert: ${subject} strict codec has no parse() method" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/typert/registry/src/service.ts:701

        `typert: invocation "${descriptor.id}" scope wire "${descriptor.scope.wire}" must select its only lookup parameter`,
      )
    }
  }
  if (descriptor.invocation.kind === 'context') {
    validateSegment('Context key', descriptor.invocation.context)
    validateWireName('Context wire field', descriptor.invocation.wire)
    if (wires.has(descriptor.invocation.wire)) {
      throw new Error(`typert: invocation "${descriptor.id}" repeats wire field "${descriptor.invocation.wire}"`)
    }
    validateCodec(descriptor.invocation.codec, `${descriptor.id} Context`)
  }
}

function validateCodec(codec: InvocationDescriptor['result'], subject: string): void {
  if (codec.mode === 'src-json') return
  validateNonempty(`${subject} type symbol`, codec.typeSymbol)
  if (typeof codec.schema.parse !== 'function') {
    throw new Error(`typert: ${subject} strict codec has no parse() method`)
  }
}

function validateWireName(subject: string, value: string): void {
  if (value === '.' || value === '..' || !/^[A-Za-z0-9_$.-]+$/.test(value)) {
    throw new Error(`typert: invalid ${subject} "${value}" — must contain only RPC endpoint segment characters`)
  }
}

function validateSegment(subject: string, value: string): void {
  if (value.length === 0 || value.includes('#')) {
    throw new Error(`typert: invalid ${subject} "${value}" — must be nonempty and must not contain "#"`)
  }
}

function validateNonempty(subject: string, value: string): void {
  if (value.length === 0) throw new Error(`typert: invalid ${subject} — must be nonempty`)
}

View on GitHub (pinned to b150a551b8)

Solutions

1. Provide a strict codec with a parse() method for the named subject.

When it happens

Trigger: Thrown at packages/typert/registry/src/service.ts:701 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/4a268661a44fe3d3. Report an issue: GitHub.