Adds deprecated.js to sideEffects
#7114
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The engine is marked as not having sideEffects, however deprecated.js contains numerous side effects.
This has important consequences, as most bundlers will tree-shake/remove
deprecated.jsin a production build, meaning code can behave differently in production. You can see a repro here https://stackblitz.com/edit/vitejs-vite-t6vvne?file=main.js,vite.config.js,index.htmlThis PR marks
deprecated.jsas a sideEffect which is a common indicator to most bundlers not to tree-shake that file.I confirm I have read the contributing guidelines and signed the Contributor License Agreement.