Prune NPM metadata fields from packages before re-publishing

scripts/release/prepare-stable-commands/prune-package-registry-metadata.js

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {logPromise} = require('../utils');
+const {readJson, writeJson} = require('fs-extra');
+const {join} = require('path');
+
+const run = async ({cwd, packages}) => {
+  const nodeModulesPath = join(cwd, 'build/node_modules');
+
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packageJSONPath = join(nodeModulesPath, packageName, 'package.json');
+    const packageJSON = await readJson(packageJSONPath);
+
+    // NPM adds a lot of metadata fields on checkout.
+    // It's nice to strip these before re-publishing the package.
+    for (let key in packageJSON) {
+      if (key.startsWith('_')) {
+        delete packageJSON[key];
+      }
+    }
+
+    await writeJson(packageJSONPath, packageJSON, {spaces: 2});
+  }
+};
+
+module.exports = async params => {
+  return logPromise(run(params), 'Pruning package registry metadata');
+};

scripts/release/prepare-stable.js

@@ -10,6 +10,7 @@ const confirmStableVersionNumbers = require('./prepare-stable-commands/confirm-s
 const guessStableVersionNumbers = require('./prepare-stable-commands/guess-stable-version-numbers');
 const parseParams = require('./prepare-stable-commands/parse-params');
 const printPrereleaseSummary = require('./shared-commands/print-prerelease-summary');
+const prunePackageRegistryMetadata = require('./prepare-stable-commands/prune-package-registry-metadata');
 const testPackagingFixture = require('./shared-commands/test-packaging-fixture');
 const testTracingFixture = require('./shared-commands/test-tracing-fixture');
 const updateStableVersionNumbers = require('./prepare-stable-commands/update-stable-version-numbers');
@@ -28,6 +29,7 @@ const run = async () => {
     await checkOutPackages(params);
     await guessStableVersionNumbers(params, versionsMap);
     await confirmStableVersionNumbers(params, versionsMap);
+    await prunePackageRegistryMetadata(params);
     await updateStableVersionNumbers(params, versionsMap);
 
     if (!params.skipTests) {