feat(build): Make package tasks invoke their prerequisites

Have the package task invoke the cleanBuildDir (as well as
cleanPackageDir) and build tasks.  Remove the checkBuildDir
task as it is now redundant since a fresh build is done every
time.

gulpfile.js

@@ -26,11 +26,15 @@ module.exports = {
 
   // Main sequence targets.  They already invoke prerequisites.
   cleanBuildDir: buildTasks.cleanBuildDir,
+  cleanReleaseDir: packageTasks.cleanReleaseDir,
   messages: buildTasks.messages,
   tsc: buildTasks.tsc,
   deps: buildTasks.deps,
   minify: buildTasks.minify,
   build: buildTasks.build,
+  package: packageTasks.package,
+  publish: releaseTasks.publish,
+  publishBeta: releaseTasks.publishBeta,
 
   // Manually-invokable targets that invoke prerequisites.
   prepare: buildTasks.prepare,
@@ -44,20 +48,16 @@ module.exports = {
 
   // Legacy target, to be deleted.
   checkin: buildTasks.checkin,
+  recompile: releaseTasks.recompile,
 
   // TBD.
   deployDemos: appengineTasks.deployDemos,
   deployDemosBeta: appengineTasks.deployDemosBeta,
-  cleanReleaseDir: packageTasks.cleanReleaseDir,
   gitSyncDevelop: gitTasks.syncDevelop,
   gitSyncMaster: gitTasks.syncMaster,
   gitCreateRC: gitTasks.createRC,
   gitUpdateGithubPages: gitTasks.updateGithubPages,
-  package: packageTasks.package,
   checkLicenses: licenseTasks.checkLicenses,
-  recompile: releaseTasks.recompile,
   prepareDemos: appengineTasks.prepareDemos,
-  publish: releaseTasks.publish,
-  publishBeta: releaseTasks.publishBeta,
   sortRequires: cleanupTasks.sortRequires,
 };

scripts/gulpfiles/package_tasks.js

@@ -19,6 +19,7 @@ gulp.replace = require('gulp-replace');
 var path = require('path');
 var fs = require('fs');
 var rimraf = require('rimraf');
+var build = require('./build_tasks');
 var {getPackageJson} = require('./helper_tasks');
 var {BUILD_DIR, RELEASE_DIR, TYPINGS_BUILD_DIR} = require('./config');
 
@@ -53,32 +54,6 @@ function packageCommonJS(namespace, dependencies) {
   });
 };
 
-// Sanity check that the BUILD_DIR directory exists, and that certain
-// files are in it.
-function checkBuildDir(done) {
-  // Check that directory exists.
-  if (!fs.existsSync(BUILD_DIR)) {
-    done(new Error(`The ${BUILD_DIR} directory does not exist.  ` +
-        'Has packageTasks.build been run?'));
-    return;
-  }
-  // Check files built by buildTasks.build exist in BUILD_DIR.
-  for (const fileName of [
-    'blockly_compressed.js',  // buildTasks.buildCompressed
-    'blocks_compressed.js',  // buildTasks.buildBlocks
-    'javascript_compressed.js',  // buildTasks.buildGenerators
-    'msg/js/en.js',  // buildTaks.buildLangfiles
-  ]) {
-    if (!fs.existsSync(`${BUILD_DIR}/${fileName}`)) {
-      done(new Error(
-          `Your ${BUILD_DIR} directory does not contain ${fileName}.  ` +
-          'Has packageTasks.build been run?  Try "npm run build".'));
-      return;
-    }
-  }
-  done();
-}
-
 /**
  * This task copies the compressed files and their source maps into
  * the release directory.
@@ -399,10 +374,14 @@ function cleanReleaseDir(done) {
 /**
  * This task prepares the files to be included in the NPM by copying
  * them into the release directory.
+ *
+ * Prerequisite: build.
  */
 const package = gulp.series(
-    checkBuildDir,
-    cleanReleaseDir,
+    gulp.parallel(
+        build.cleanBuildDir,
+        cleanReleaseDir),
+    build.build,
     gulp.parallel(
         packageIndex,
         packageCompressed,
@@ -426,6 +405,7 @@ const package = gulp.series(
     );
 
 module.exports = {
+  // Main sequence targets.  Each should invoke any immediate prerequisite(s).
   cleanReleaseDir: cleanReleaseDir,
   package: package,
 };

scripts/gulpfiles/release_tasks.js

@@ -147,27 +147,18 @@ function updateBetaVersion(done) {
   done();
 }
 
-// Build Blockly and prepare to check in the resulting built files.
-const rebuildAll = gulp.series(
-  buildTasks.cleanBuildDir,
-  buildTasks.build,
-  buildTasks.checkin,
-  );
-
-// Package and publish to npm.
+// Rebuild, package and publish to npm.
 const publish = gulp.series(
-  rebuildAll,
-  packageTasks.package,
+  packageTasks.package,  // Does clean + build.
   checkBranch,
   checkReleaseDir,
   loginAndPublish
 );
 
-// Publish a beta version of Blockly.
+// Rebuild, package and publish a beta version of Blockly.
 const publishBeta = gulp.series(
   updateBetaVersion,
-  rebuildAll,
-  packageTasks.package,
+  packageTasks.package,  // Does clean + build.
   checkBranch,
   checkReleaseDir,
   loginAndPublishBeta
@@ -179,12 +170,16 @@ const recompileDevelop = gulp.series(
   gitTasks.syncDevelop(),
   gitTasks.createRebuildBranch,
   updateVersionPrompt,
-  rebuildAll,
+  packageTasks.package,  // Does clean + build.
+  buildTasks.checkin,
   gitTasks.pushRebuildBranch
   );
 
 module.exports = {
+  // Main sequence targets.  Each should invoke any immediate prerequisite(s).
+  publishBeta,
+  publish,
+
+  // Legacy target, to be deleted.
   recompile: recompileDevelop,
-  publishBeta: publishBeta,
-  publish: publish
-}
+};