deepseek-ai/deepseek-harness · error · Error

typert: lookup "${key}" is already registered

Error message

typert: lookup "${key}" is already registered

What it means

Error "typert: lookup "${key}" is already registered" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/typert/registry/src/service.ts:296

    return ctx.effect(function* () {
      resolvers.set(key, entry)
      changes.emit({ kind: 'lookup', key })
      yield () => {
        /* v8 ignore next -- duplicate configuration is rejected, so this effect remains the key's unique owner. */
        if (resolvers.get(key) !== entry) return
        resolvers.delete(key)
        changes.emit({ kind: 'lookup', key })
      }
    }, `typert.lookups.configure(${JSON.stringify(key)})`)
  }

  private register<Host, Wire>(ctx: Context, key: string, provider: TypertLookupProvider<Host, Wire>): TypertDisposer {
    validateSegment('lookup key', key)
    validateSegment('lookup parameter', provider.parameter)
    validateWireName('lookup wire field', provider.wire)
    validateNonempty('lookup Host type symbol', provider.hostTypeSymbol)
    validateNonempty('lookup wire type symbol', provider.wireTypeSymbol)
    if (this.providers.has(key)) throw new Error(`typert: lookup "${key}" is already registered`)
    const definition: TypertLookupDefinition = {
      key,
      parameter: provider.parameter,
      wire: provider.wire,
      hostTypeSymbol: provider.hostTypeSymbol,
      wireTypeSymbol: provider.wireTypeSymbol,
    }
    const known = this.definitions.get(key)
    if (known !== undefined && !lookupDefinitionEquals(known, definition)) {
      throw new Error(`typert: lookup "${key}" changed its wire declaration during this registry lifetime`)
    }
    const owner = {}
    const entry: ProviderEntry<TypertLookupProvider> = { provider, owner }
    const { definitions, providers, changes } = this
    return ctx.effect(function* () {
      definitions.set(key, definition)
      providers.set(key, entry)
      changes.emit({ kind: 'lookup', key })

View on GitHub (pinned to b150a551b8)

Solutions

1. Register the lookup once per key; dispose the existing registration before replacing it.

When it happens

Trigger: Thrown at packages/typert/registry/src/service.ts:296 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/397b3fe8296938c9. Report an issue: GitHub.