Update to handle patterns in 'files' field, terminate the build if en…

…try point not whitelisted, terminate the build if 'files' field is missing from package.json

scripts/rollup/packaging.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const basename = require('path').basename;
+const dirname = require('path').dirname;
 const fs = require('fs');
 const join = require('path').join;
 const resolve = require('path').resolve;
@@ -157,7 +158,7 @@ function copyBundleIntoNodePackage(packageName, filename, bundleType) {
 function copyNodePackageTemplate(packageName) {
   const from = resolve(`./packages/${packageName}`);
   const to = resolve(`./build/packages/${packageName}`);
-  const npmFrom = resolve(`${from}/npm`);
+  const npmFrom = `${from}/npm`;
   if (!fs.existsSync(npmFrom)) {
     // The package is not meant for npm consumption.
     return Promise.resolve();
@@ -166,53 +167,81 @@ function copyNodePackageTemplate(packageName) {
     // We already created this package (e.g. due to another entry point).
     return Promise.resolve();
   }
-  fs.mkdirSync(to);
-  const packageJson = resolve(`${from}/package.json`);
-  const whitelistedFiles = (fs.existsSync(packageJson) &&
-    require(packageJson).files) || [];
-  const npmRootFiles = fs.readdirSync(npmFrom);
   // Get all entry points in the package root
   // Exceptions: *.fb.js
-  const packageRootEntries = glob.sync('!(*.fb).js', {
+  const packageEntries = glob.sync('!(*.fb).js', {
     cwd: from,
   });
-  packageRootEntries.forEach(entry => {
-    // Terminate the build if any entry point in the package root
-    // does not have an equivalent in ./npm.
-    if (!npmRootFiles.includes(entry)) {
+  const npmFiles = fs.readdirSync(npmFrom);
+  packageEntries.forEach(entry => {
+    if (!npmFiles.includes(entry)) {
+      // Terminate the build if any entry point(Exception: *.fb.js)
+      // does not have an equivalent in ./npm.
       console.error(
         `Entry point ${entry} in package ${packageName} does not have an equivalent in ./npm`
       );
       process.exit(1);
     }
   });
-  if (whitelistedFiles.length > 0) {
-    // Looping through files and folders in ./npm root,
-    // if whitelisted in package.json, copy to build package root,
-    // return an array of the promises generated by async copy.
-    const promisesForForwardingModules = npmRootFiles.reduce(
-      (promises, file) => {
-        if (
-          whitelistedFiles.includes(file) ||
-          whitelistedFiles.includes(`${file}/`)
-        ) {
-          promises.push(
-            asyncCopyTo(resolve(`${npmFrom}/${file}`), `${to}/${file}`)
-          );
-        }
-        return promises;
-      },
-      []
+  const packageJson = `${from}/package.json`;
+  const whitelist = fs.existsSync(packageJson) && require(packageJson).files;
+  let promisesForForwardingModules = [];
+  if (!whitelist) {
+    // Terminate the build if 'files' field is missing from package.json.
+    console.error(
+      `'files' field is missing from package.json in package ${packageName}`
     );
-    return Promise.all([
-      ...promisesForForwardingModules,
-      asyncCopyTo(resolve(`${from}/package.json`), `${to}/package.json`),
-      asyncCopyTo(resolve(`${from}/README.md`), `${to}/README.md`),
-      asyncCopyTo(resolve('./LICENSE'), `${to}/LICENSE`),
-    ]);
+    process.exit(1);
   } else {
-    return Promise.resolve();
+    // 'files' field exists in package.json,
+    fs.mkdirSync(to);
+    let existingDirCache = {};
+    // looping through entries(single file / directory / pattern) in `files`
+    const whitelistedFiles = whitelist.reduce((list, pattern) => {
+      const matchedFiles = glob.sync(pattern, {
+        cwd: npmFrom,
+      });
+      // copy matching files/directories from './npm' to build package.
+      matchedFiles.forEach(file => {
+        if (fs.lstatSync(`${npmFrom}/${file}`).isFile()) {
+          // copy source is a file, create all nesting directories ahead
+          // to avoid 'No such file or directory' error
+          const fileDirnameSegments = dirname(file).split('/');
+          fileDirnameSegments.reduce((prevPath, currentPath) => {
+            const fullPath = `${prevPath}/${currentPath}`;
+            if (!existingDirCache[fullPath] && !fs.existsSync(fullPath)) {
+              existingDirCache[fullPath] = true;
+              fs.mkdirSync(`${to}/${fullPath}`);
+            }
+            return fullPath;
+          }, '');
+        }
+        promisesForForwardingModules.push(
+          asyncCopyTo(`${npmFrom}/${file}`, `${to}/${file}`)
+        );
+      });
+      // return an array of whitelisted files
+      // for entry point check next.
+      // All patterns have been parsed to file/directory
+      return list.concat(matchedFiles);
+    }, []);
+    // terminate the build if any entry point(Exception: *.fb.js)
+    // is not whitelisted in the 'files' field in package.json.
+    packageEntries.forEach(entry => {
+      if (!whitelistedFiles.includes(entry)) {
+        console.error(
+          `Entry point ${entry} in package ${packageName} is not listed in the 'files' field in package.json`
+        );
+        process.exit(1);
+      }
+    });
   }
+  return Promise.all([
+    ...promisesForForwardingModules,
+    asyncCopyTo(resolve(`${from}/package.json`), `${to}/package.json`),
+    asyncCopyTo(resolve(`${from}/README.md`), `${to}/README.md`),
+    asyncCopyTo(resolve('./LICENSE'), `${to}/LICENSE`),
+  ]);
 }
 
 function createNodePackage(bundleType, packageName, filename) {