Build standalone on prepublish

Makefile

@@ -28,6 +28,12 @@ build-standalone:
 build-preset-env-standalone:
 	./node_modules/.bin/gulp build-babel-preset-env-standalone
 
+prepublish-build-standalone:
+	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-standalone
+
+prepublish-build-preset-env-standalone:
+	BABEL_ENV=production IS_PUBLISH=true ./node_modules/.bin/gulp build-babel-preset-env-standalone
+
 build-dist: build
 	cd packages/babel-polyfill; \
 	scripts/build-dist.sh
@@ -115,7 +121,7 @@ prepublish-build:
 	rm -rf packages/babel-runtime/helpers
 	rm -rf packages/babel-runtime-corejs2/helpers
 	rm -rf packages/babel-runtime-corejs2/core-js
-	BABEL_ENV=production IS_PUBLISH=true make build-dist
+	BABEL_ENV=production make build-dist
 	make clone-license
 
 prepublish:

packages/babel-preset-env-standalone/scripts/prepublish.js

@@ -0,0 +1,11 @@
+// This file is executed by lerna before publishing,
+// @babel/preset-env-standalone so that it has the
+// new version and not the old one.
+
+require("child_process").execSync(
+  "make prepublish-build-preset-env-standalone",
+  {
+    cwd: require("path").resolve(__dirname, "../../.."),
+    stdio: "inherit",
+  }
+);

packages/babel-standalone/scripts/prepublish.js

@@ -0,0 +1,7 @@
+// This file is executed by lerna before publishing @babel/standalone,
+// so that it has the new version and not the old one.
+
+require("child_process").execSync("make prepublish-build-standalone", {
+  cwd: require("path").resolve(__dirname, "../../.."),
+  stdio: "inherit",
+});