Function resolveExact

test/model-resolve.test.ts:93–102

(index: Map<string, Val>, modelId: string, providers: Set<string>)

  // Faithful replication of RouterCore.resolveModel (exact path) + the new
  // resolvePreferringDefaultProvider tie-break.
  const resolveExact = (index: Map<string, Val>, modelId: string, providers: Set<string>) => {
    const direct = index.get(modelId);
    if (!direct) return null;
    let resolvedId = modelId;
    if (modelId.includes('/')) {
      const [first, ...rest] = modelId.split('/');
      if (first && providers.has(first)) resolvedId = rest.join('/');
    }
    return { provider: direct.provider, resolvedId };
  };
  const resolvePreferringDefault = (index: Map<string, Val>, modelId: string, defProvider: string, providers: Set<string>) => {
    if (!modelId.includes('/')) {
      const q = resolveExact(index, `${defProvider}/${modelId}`, providers);