Function visitPackage

cli/lib/commands/download.js:53–127

(opts, spec, now, range, seenFiles, fetching)

}

async function visitPackage(opts, spec, now, range, seenFiles, fetching) {
  const { canonical: name } = spec;

  const data = await fetchPackage(opts, name, now);
  if (!semver.validRange(range)) {
    const version = data.tags[range];
    if (!version) {
      opts.log.error(`Failed to fetch resolve range for ${spec}: ${range}`);
      throw new Error();
    }
    range = version; // peg it to a version
  }

  const checks = [];
  for (const [version, integrity] of Object.entries(data.versions)) {
    if (!semver.satisfies(version, range)) {
      continue;
    }

    const check = cacache.get
      .byDigest(opts.cache, integrity)
      .catch(() => null)
      .then(content => {
        return content
          ? content
          : fetchPackageVersion(opts, name, version, integrity);
      })
      .then(content => [version, content]);

    checks.push(check);
  }

  if (!checks.length) {
    opts.log.error(
      `Failed to fetch resolve range for ${name}: ${range} matched no versions!`
    );
    throw new Error();
  }

  const resolvedVersions = await Promise.all(checks);
  const deps = new Set();
  for (const [version, content] of resolvedVersions) {
    const versiondata = JSON.parse(String(content));
    for (const filename in versiondata.files) {
      if (seenFiles.has(versiondata.files[filename])) {
        continue;
      }

      seenFiles.add(versiondata.files[filename]);

      const loading = fetchObject(opts, versiondata.files[filename]);

      loading.catch(() => {});
      fetching.push(loading);
    }

    for (const dep in versiondata.dependencies) {
      deps.add(`${dep}@${versiondata.dependencies[dep]}`);