+* **build:** cjs build failing due to `__VUE_PROD_DEVTOOLS__` defined ([#1991](https://github.com/vuejs/vuex/issues/1991)) ([#1992](https://github.com/vuejs/vuex/issues/1992)) ([7151622](https://github.com/vuejs/vuex/commit/7151622d646968686546f1c4c80f7575c9b99176))
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