export function getGitHubRuntime(environment = process.env) {

const token = environment.GH_TOKEN;

const repository = environment.REPOSITORY;

const pullRequestNumber = Number(environment.PR_NUMBER);

if (!token) {

throw new Error('GH_TOKEN is required');

}

if (!/^[^/]+\/[^/]+$/.test(repository ?? '')) {

throw new Error('REPOSITORY must use the owner/name format');

}

if (!Number.isInteger(pullRequestNumber) || pullRequestNumber <= 0) {

throw new Error('PR_NUMBER must be a positive integer');

}

return {

token,

repository,

pullRequestNumber,

apiBase: environment.GITHUB_API_URL || 'https://api.github.com',

};

}

export function createGitHubClient({token, apiBase, fetchImplementation = fetch}) {

async function request(path, options = {}) {

const response = await fetchImplementation(`${apiBase}${path}`, {

...options,

headers: {

Accept: 'application/vnd.github+json',

Authorization: `Bearer ${token}`,

'X-GitHub-Api-Version': '2022-11-28',

...options.headers,

},

});

const text = await response.text();

const data = text ? JSON.parse(text) : null;

if (!response.ok) {

const details = data?.errors ? ` ${JSON.stringify(data.errors)}` : '';

const error = new Error(

`GitHub API ${response.status}: ${data?.message ?? text}${details}`

);

error.status = response.status;

throw error;

}

return data;

}

async function paginate(path) {

const items = [];

for (let page = 1; ; page += 1) {

const separator = path.includes('?') ? '&' : '?';

const result = await request(`${path}${separator}per_page=100&page=${page}`);

items.push(...result);

if (result.length < 100) {

return items;

}

}

}

return {request, paginate};

}