Grunt watch
We studied Grunt in Chapter 3, Improving PHP 7 Application Performance. We only used it to merge CSS and JavaScript files and minify them. However, Grunt is not used only for this purpose. It is a JavaScript task runner, which can run tasks either by watching specific files for changes or by manually running tasks. We studied how we can run tasks manually, so now we will study how to use grunt watch to run specific tasks when some changes are made.
Grunt watch is useful and saves a lot of time because it runs the specific tasks automatically instead of running the tasks manually every time we change something.
Let's recall our examples from Chapter 3, Improving PHP 7 Application Performance. We used Grunt to combine and compress CSS ...
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