deepseek-ai/deepseek-harness · error · TypeGraphRenderError

unsupported model variant ${JSON.stringify(value)}

Error message

unsupported model variant ${JSON.stringify(value)}

What it means

Error "unsupported model variant ${JSON.stringify(value)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/typert/generator/src/renderer.ts:364

  return node.kind === 'union' || node.kind === 'intersection' || node.kind === 'function' || node.kind === 'constructor' || node.kind === 'conditional'
}

function renderPropertyName(name: string): string {
  if (name.startsWith('[') && name.endsWith(']')) return name
  if (/^(?:[$A-Z_a-z][$\w]*|\d+)$/u.test(name)) return name
  return quote(name)
}

function quote(value: string): string {
  return `'${value.replaceAll('\\', '\\\\').replaceAll("'", "\\'").replaceAll('\n', '\\n')}'`
}

function escapeTemplate(value: string): string {
  return value.replaceAll('\\', '\\\\').replaceAll('`', '\\`').replaceAll('${', '\\${')
}

function assertNever(value: never): never {
  throw new TypeGraphRenderError(`unsupported model variant ${JSON.stringify(value)}`)
}

View on GitHub (pinned to b150a551b8)

Solutions

1. Pass a supported model variant; check the value against the documented union.

When it happens

Trigger: Thrown at packages/typert/generator/src/renderer.ts:364 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/96efee58b4244892. Report an issue: GitHub.