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core/scripts/js/rename-js-files-to-es6.sh

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+#!/bin/bash
+
+# Rename *.js files in *.es6.js. Only need to be run once.
+# Should be removed after *.es6.js files are committed to core.
+#
+# @internal This file is part of the core javascript build process and is only
+# meant to be used in that context.
+
+for js in `find ./{misc,modules,themes} -name '*.js'`;
+do
+   mv ${js} ${js%???}.es6.js;
+done