@kronodeus/nwz/dist/api.js

Browse the top stories from Hacker News right in your terminal.

export async function fetchTopTenStories() {
    const storyIds = await fetch('https://hacker-news.firebaseio.com/v0/topstories.json').then((response) => response.json());
    if (!Array.isArray(storyIds)) {
        throw new Error(`Unexpected response from news source. Expected array, but received: ${display(storyIds)}`);
    }
    const stories = [];
    for (const storyId of storyIds.slice(0, 10)) {
        if (typeof storyId !== 'number') {
            throw new Error(`Invalid story ID from news source. Expected number, but received: ${display(storyId)}`);
        }
        const story = await fetch(`https://hacker-news.firebaseio.com/v0/item/${storyId}.json`).then((response) => response.json());
        stories.push(validateStory(story));
    }
    return stories;
}
function validateStory(story) {
    if (!story || typeof story !== 'object' || Array.isArray(story)) {
        throw new Error(`Invalid story from news source. Expected object, but received: ${display(story)}`);
    }
    const url = story['url'] ?? buildFallbackUrl(story['id']);
    if (typeof url !== 'string') {
        throw new Error(`Invalid story URL from news source. Expected string, but received: ${display(url)}`);
    }
    const title = story['title'];
    if (typeof title !== 'string') {
        throw new Error(`Invalid story title from news source. Expected string, but received: ${display(title)}`);
    }
    const score = story['score'];
    if (typeof score !== 'number') {
        throw new Error(`Invalid story score from news source. Expected number, but received: ${display(score)}`);
    }
    return { url, title, score };
}
function display(value) {
    return `${value} (${typeof value})`;
}
/**
 * Some stories, like the "Ask HN" ones, are just discussions and therefore do not have any
 * external URL. In these cases, we can just build a link to the story on HN using the ID.
 */
function buildFallbackUrl(storyId) {
    if (typeof storyId !== 'number') {
        throw new Error(`Failed to build URL. Invalid story ID from news source. Expected number, but received: ${display(storyId)}`);
    }
    return `https://news.ycombinator.com/item?id=${storyId}`;
}
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