diff --git a/gulpfile.js b/gulpfile.js
index 887e18855..e1fd6f369 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -32,6 +32,7 @@ module.exports = {
   buildCompressed: buildTasks.compressed,
   buildGenerators: buildTasks.generators,
   buildAdvancedCompilationTest: buildTasks.advancedCompilationTest,
+  checkinBuilt: buildTasks.checkinBuilt,
   gitSyncDevelop: gitTasks.syncDevelop,
   gitSyncMaster: gitTasks.syncMaster,
   gitCreateRC: gitTasks.createRC,
diff --git a/package.json b/package.json
index 341b118ce..ad0401410 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "build:langfiles": "gulp buildLangfiles",
     "build:uncompressed": "gulp buildUncompressed",
     "bump": "npm --no-git-tag-version version 4.$(date +'%Y%m%d').0",
+    "checkin": "gulp checkinBuilt",
     "deployDemos": "gulp deployDemos",
     "format": "git-clang-format",
     "format:sortrequires": "gulp sortRequires",
diff --git a/scripts/gulpfiles/build_tasks.js b/scripts/gulpfiles/build_tasks.js
index 69fda0a23..41b41a962 100644
--- a/scripts/gulpfiles/build_tasks.js
+++ b/scripts/gulpfiles/build_tasks.js
@@ -538,6 +538,17 @@ const build = gulp.parallel(
   buildLangfiles
 );
 
+/**
+ * This task copies built files from BUILD_DIR back to the repository
+ * so they can be committed to git.
+ */
+function checkinBuilt() {
+  return gulp.src([
+    `${BUILD_DIR}/**.js`,
+    `${BUILD_DIR}/**/**.js`,
+  ]).pipe(gulp.dest('.'));
+};
+
 module.exports = {
   build: build,
   core: buildCore,
@@ -547,5 +558,6 @@ module.exports = {
   uncompressed: buildUncompressed,
   compressed: buildCompressed,
   generators: buildGenerators,
+  checkinBuilt: checkinBuilt,
   advancedCompilationTest: buildAdvancedCompilationTest,
 }