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scripts/checkLicense.mjs

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+import fs from 'fs';
+import path from 'path';
+import util from 'util';
+
+import licenseChecker from 'license-checker';
+
+const acceptableLicenses = [
+  'MIT',
+  'ISC',
+  'Apache-2.0',
+  'BSD-3-Clause',
+  'CC-BY-4.0',
+];
+
+const asyncLicenseChecker = (options) => {
+  return new Promise((resolve, reject) => {
+    licenseChecker.init(options, (err, data) => {
+      if (err != null) reject(err);
+      else resolve(data)
+    });
+  });
+};
+
+export default async function() {
+  const packageInfo = await util.promisify(fs.readFile)('package.json', { encoding: 'utf8' })
+    .then((data) => JSON.parse(data));
+  const packages = await asyncLicenseChecker({ start: path.resolve(), production: true });
+
+  let ok = true;
+
+  const ignorePackageName = packageInfo.name;
+
+  for (const [name, info] of Object.entries(packages)) {
+    const acceptable = acceptableLicenses.includes(info.licenses);
+    if (acceptable) continue;
+    if (name.startsWith(`${ignorePackageName}@`)) continue;
+
+    console.error(name);
+    ok = false;
+  }
+
+  if (!ok) {
+    process.exit(1);
+  }
+}