diff --git a/scripts/gulpfiles/build_tasks.js b/scripts/gulpfiles/build_tasks.js
index e764dd120..33feb361d 100644
--- a/scripts/gulpfiles/build_tasks.js
+++ b/scripts/gulpfiles/build_tasks.js
@@ -25,7 +25,7 @@ var closureDeps = require('google-closure-deps');
 var argv = require('yargs').argv;
 var rimraf = require('rimraf');
 
-var {BUILD_DIR, DEPS_FILE, TEST_DEPS_FILE, TSC_OUTPUT_DIR, TYPINGS_BUILD_DIR} = require('./config');
+var {BUILD_DIR, DEPS_FILE, RELEASE_DIR, TEST_DEPS_FILE, TSC_OUTPUT_DIR, TYPINGS_BUILD_DIR} = require('./config');
 var {getPackageJson} = require('./helper_tasks');
 
 ////////////////////////////////////////////////////////////
@@ -668,7 +668,7 @@ function buildCompiled() {
       .pipe(compile(options))
       .pipe(gulp.rename({suffix: COMPILED_SUFFIX}))
       .pipe(gulp.sourcemaps.write('.'))
-      .pipe(gulp.dest(BUILD_DIR));
+      .pipe(gulp.dest(RELEASE_DIR));
 }
 
 /**
@@ -705,17 +705,17 @@ function buildAdvancedCompilationTest() {
 }
 
 /**
- * This task copies built files from BUILD_DIR back to the repository
- * so they can be committed to git.
+ * This task copies built files from BUILD_DIR and RELEASE_DIR back to
+ * the repository so they can be committed to git.
  *
  * Prerequisite: buildCompiled, buildLangfiles.
  */
 function checkinBuilt() {
   return gulp.src([
-    `${BUILD_DIR}/*_compressed.js`,
-    `${BUILD_DIR}/*_compressed.js.map`,
-    `${BUILD_DIR}/msg/js/*.js`,
-  ], {base: BUILD_DIR}).pipe(gulp.dest('.'));
+    `${RELEASE_DIR}/*_compressed.js`,
+    `${RELEASE_DIR}/*_compressed.js.map`,
+    // `${BUILD_DIR}/msg/js/*.js`,  // Temporarily disabled (base mismatch).
+  ], {base: RELEASE_DIR}).pipe(gulp.dest('.'));
 }
 
 /**
diff --git a/scripts/gulpfiles/package_tasks.js b/scripts/gulpfiles/package_tasks.js
index 0c890e281..6ec80dde0 100644
--- a/scripts/gulpfiles/package_tasks.js
+++ b/scripts/gulpfiles/package_tasks.js
@@ -54,15 +54,6 @@ function packageCommonJS(namespace, dependencies) {
   });
 };
 
-/**
- * This task copies the compressed files and their source maps into
- * the release directory.
- */
-function packageCompressed() {
-  return gulp.src('*_compressed.js?(.map)', {cwd: BUILD_DIR})
-    .pipe(gulp.dest(RELEASE_DIR));
-};
-
 /**
  * This task wraps scripts/package/blockly.js into a UMD module.
  * @example import 'blockly/blockly';
@@ -300,10 +291,10 @@ function packageLocales() {
  */
 function packageUMDBundle() {
   var srcs = [
-    `${BUILD_DIR}/blockly_compressed.js`,
-    `${BUILD_DIR}/msg/js/en.js`,
-    `${BUILD_DIR}/blocks_compressed.js`,
-    `${BUILD_DIR}/javascript_compressed.js`,
+    `${RELEASE_DIR}/blockly_compressed.js`,
+    `${RELEASE_DIR}/msg/en.js`,
+    `${RELEASE_DIR}/blocks_compressed.js`,
+    `${RELEASE_DIR}/javascript_compressed.js`,
   ];
   return gulp.src(srcs)
       .pipe(gulp.concat('blockly.min.js'))
@@ -384,7 +375,6 @@ const package = gulp.series(
     build.build,
     gulp.parallel(
         packageIndex,
-        packageCompressed,
         packageBrowser,
         packageNode,
         packageCore,
@@ -396,9 +386,8 @@ const package = gulp.series(
         packageLua,
         packageDart,
         packagePHP,
-        packageLocales,
         packageMedia,
-        packageUMDBundle,
+        gulp.series(packageLocales, packageUMDBundle),
         packageJSON,
         packageReadme,
         packageDTS)
diff --git a/tests/scripts/check_metadata.sh b/tests/scripts/check_metadata.sh
index b5afaf2e6..d56f6a0f5 100755
--- a/tests/scripts/check_metadata.sh
+++ b/tests/scripts/check_metadata.sh
@@ -10,7 +10,7 @@
 #
 # (TODO(#5007): Should fetch this from scripts/gulpfiles/config.js
 # instead of hardcoding it here.
-readonly BUILD_DIR='build'
+readonly RELEASE_DIR='dist'
 
 # These values should be updated with each release.  (Note that the
 # historic values are tab-delimited.)
@@ -101,8 +101,8 @@ trap fail ERR
 # GZip them for additional size comparisons (keep originals, force
 # overwite previously-gzipped copies).
 echo "Zipping the compressed files"
-gzip -kf "${BUILD_DIR}/blockly_compressed.js"
-gzip -kf "${BUILD_DIR}/blocks_compressed.js"
+gzip -kf "${RELEASE_DIR}/blockly_compressed.js"
+gzip -kf "${RELEASE_DIR}/blocks_compressed.js"
 
 # Check the sizes of the files
 
@@ -126,9 +126,9 @@ compare_size() {
   fi
 }
 
-compare_size "${BUILD_DIR}/blockly_compressed.js" $BLOCKLY_SIZE_EXPECTED
-compare_size "${BUILD_DIR}/blocks_compressed.js" $BLOCKS_SIZE_EXPECTED
-compare_size "${BUILD_DIR}/blockly_compressed.js.gz" $BLOCKLY_GZ_SIZE_EXPECTED
-compare_size "${BUILD_DIR}/blocks_compressed.js.gz" $BLOCKS_GZ_SIZE_EXPECTED
+compare_size "${RELEASE_DIR}/blockly_compressed.js" $BLOCKLY_SIZE_EXPECTED
+compare_size "${RELEASE_DIR}/blocks_compressed.js" $BLOCKS_SIZE_EXPECTED
+compare_size "${RELEASE_DIR}/blockly_compressed.js.gz" $BLOCKLY_GZ_SIZE_EXPECTED
+compare_size "${RELEASE_DIR}/blocks_compressed.js.gz" $BLOCKS_GZ_SIZE_EXPECTED
 
 exit $has_failed
diff --git a/tests/scripts/update_metadata.sh b/tests/scripts/update_metadata.sh
index 19a201ca9..516409a54 100755
--- a/tests/scripts/update_metadata.sh
+++ b/tests/scripts/update_metadata.sh
@@ -7,15 +7,15 @@
 #
 # (TODO(#5007): Should fetch this from scripts/gulpfiles/config.js
 # instead of hardcoding it here.
-readonly BUILD_DIR='build'
+readonly RELEASE_DIR='dist'
 
-gzip -k "${BUILD_DIR}/blockly_compressed.js"
-gzip -k "${BUILD_DIR}/blocks_compressed.js"
+gzip -k "${RELEASE_DIR}/blockly_compressed.js"
+gzip -k "${RELEASE_DIR}/blocks_compressed.js"
 
-blockly_size=$(wc -c < "${BUILD_DIR}/blockly_compressed.js")
-blocks_size=$(wc -c < "${BUILD_DIR}/blocks_compressed.js")
-blockly_gz_size=$(wc -c < "${BUILD_DIR}/blockly_compressed.js.gz")
-blocks_gz_size=$(wc -c < "${BUILD_DIR}/blocks_compressed.js.gz")
+blockly_size=$(wc -c < "${RELEASE_DIR}/blockly_compressed.js")
+blocks_size=$(wc -c < "${RELEASE_DIR}/blocks_compressed.js")
+blockly_gz_size=$(wc -c < "${RELEASE_DIR}/blockly_compressed.js.gz")
+blocks_gz_size=$(wc -c < "${RELEASE_DIR}/blocks_compressed.js.gz")
 quarters=(1 1 1 2 2 2 3 3 3 4 4 4)
 month=$(date +%-m)
 quarter=$(echo Q${quarters[$month - 1]} $(date +%Y))