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Grunt supports executing tasks when files/directories change using the grunt-contrib-watch plugin. https://github.com/gruntjs/grunt-contrib-watch

That isnt what the post you are replying to is saying

make etc will realise a build target doesnt need recompiled because nothing has changed, this lets you recompile fairly large projects where only a single file has changed reasonably quickly

Yes this is not the same thing. Grunt rebuilds everything for tasks, and does not selectively build only targets that have had dependencies change. Make doesn't require any kind of running process for this.

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