Fix release process

The documented release process is to do npm run recompile, merge the
resulting branch to develop, and then do npm run relase, which does
not do another build.

This process should probably be changed, but for the moment ensure
that npm run recompile (as well as npm run package:beta) runs
buildTasks.checkinBuilt after each .build to preserve the old procedure.

scripts/gulpfiles/git_tasks.js

@@ -103,7 +103,9 @@ const updateGithubPages = gulp.series(
     execSync('git reset --hard upstream/develop', { stdio: 'inherit' });
     done();
   },
+  buildTasks.cleanBuildDir,
   buildTasks.build,
+  buildTasks.checkinBuilt,
   function(done) {
     execSync('git commit -am "Rebuild"', { stdio: 'inherit' });
     execSync('git push ' + upstream_url + ' gh-pages --force', { stdio: 'inherit' });

scripts/gulpfiles/package_tasks.js

@@ -17,12 +17,20 @@ gulp.umd = require('gulp-umd');
 
 var path = require('path');
 var fs = require('fs');
+var rimraf = require('rimraf');
 var {getPackageJson} = require('./helper_tasks');
-var {BUILD_DIR, RELEASE_DIR} = require('./config');
+var {RELEASE_DIR} = require('./config');
 
 // Path to template files for gulp-umd.
 const TEMPLATE_DIR = 'scripts/package/templates';
 
+// Path from which to pull files to package.
+//
+// TODO(cpcallen): Use BUILD_DIR from config.js once release_tasks are
+// updated to do build-package-release all in one go, instead of doing
+// build-checkin and then package-release as separate steps.
+var BUILD_DIR = '.';
+
 /**
  * A helper method for wrapping a file into a Universal Module Definition.
  * @param {string} namespace The export namespace.

scripts/gulpfiles/release_tasks.js

@@ -160,7 +160,9 @@ const publish = gulp.series(
 // Publish a beta version of Blockly.
 const publishBeta = gulp.series(
   updateBetaVersion,
+  buildTasks.cleanBuildDir,
   buildTasks.build,
+  buildTasks.checkinBuilt,
   packageTasks.package,
   checkBranch,
   checkReleaseDir,
@@ -172,7 +174,9 @@ const recompile = gulp.series(
   gitTasks.syncDevelop(),
   gitTasks.createRebuildBranch,
   updateVersionPrompt,
+  buildTasks.cleanBuildDir,
   buildTasks.build,
+  buildTasks.checkinBuilt,
   typings.typings,
   gitTasks.pushRebuildBranch
   );