unpkg/modules/utils/getNpmPackageInfo.js

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const cache = require('./cache');
const fetchNpmPackageInfo = require('./fetchNpmPackageInfo');
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const notFound = '';
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function cleanPackageInfo(packageInfo) {
return {
versions: Object.keys(packageInfo.versions).reduce((memo, key) => {
memo[key] = packageInfo.versions[key];
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return memo;
}, {}),
'dist-tags': packageInfo['dist-tags']
};
}
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function getNpmPackageInfo(packageName) {
return new Promise((resolve, reject) => {
const key = `npmPackageInfo-${packageName}`;
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const value = cache.get(key);
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if (value != null) {
resolve(value === notFound ? null : JSON.parse(value));
} else {
fetchNpmPackageInfo(packageName).then(value => {
if (value == null) {
// Cache 404s for 5 minutes. This prevents us from making
// unnecessary requests to the registry for bad package names.
// In the worst case, a brand new package's info will be
// available within 5 minutes.
cache.setex(key, 300, notFound);
resolve(null);
} else {
value = cleanPackageInfo(value);
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// Cache valid package info for 1 minute. In the worst case,
// new versions won't be available for 1 minute.
cache.setex(key, 60, JSON.stringify(value));
resolve(value);
}
}, reject);
}
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});
}
module.exports = getNpmPackageInfo;