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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566// Jev via the AI Gateway evaluation protocol. Node 22+, no dependencies.// Protocol source: vercel/ai packages/gateway/src/gateway-evaluation-model.tsimport { pathToFileURL } from 'node:url';
export async function evaluate({ state, questions }, { apiKey = process.env.AI_GATEWAY_API_KEY, fetchImpl = globalThis.fetch, signal = AbortSignal.timeout(10_000),} = {}) { if (!apiKey) throw new Error('Set AI_GATEWAY_API_KEY to a Vercel AI Gateway key.'); if (!questions || !Object.keys(questions).length || state == null) throw new Error('Provide state and at least one typed question.'); const response = await fetchImpl('https://ai-gateway.vercel.sh/v4/ai/evaluation-model', { method: 'POST', signal, redirect: 'error', headers: { Authorization: `Bearer ${apiKey}`, 'Content-Type': 'application/json', 'ai-gateway-protocol-version': '0.0.1', 'ai-gateway-auth-method': 'api-key', 'ai-evaluation-model-specification-version': '4', 'ai-model-id': 'typesafe-ai/jev', }, body: JSON.stringify({ state, questions, providerOptions: { gateway: { zeroDataRetention: true } } }), }); // Do not echo upstream error bodies, which may contain submitted state. if (!response.ok) throw new Error(`Jev gateway returned HTTP ${response.status}.`); const result = await response.json(); return validateAnswers(result, questions);}
export function validateAnswers(result, questions) { for (const [id, question] of Object.entries(questions)) { const answer = result.answers?.[id]; if (!answer || answer.type !== question.type) throw new Error(`Missing or invalid answer: ${id}`); if (question.type === 'choice' && !Object.hasOwn(question.criteria, answer.choice)) throw new Error(`Unknown choice: ${id}`); if (question.type === 'boolean' && !probability(answer.probability)) throw new Error(`Invalid probability: ${id}`); if (question.type === 'score' && (!Number.isFinite(answer.score) || answer.score < 0 || answer.score > question.criteria.length - 1)) throw new Error(`Invalid score: ${id}`); if (answer.probabilities && Object.values(answer.probabilities).some(p => !probability(p))) throw new Error(`Invalid probabilities: ${id}`); } return result;}
const probability = p => Number.isFinite(p) && p >= 0 && p <= 1;
if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) { try { let input = ''; for await (const chunk of process.stdin) { input += chunk; if (input.length > 256_000) throw new Error('Input exceeds 256 KB.'); } console.log(JSON.stringify(await evaluate(JSON.parse(input)), null, 2)); } catch (error) { console.error(error.message); process.exitCode = 1; }}