What are the most common cause of memory leaks in Vue.js apps, and how can they be solved?

In Vue.js applications, memory leaks often come from using third-party libraries that create their own instances and/or manipulate the DOM. The v-if directive and the Vue Router destroy Vue component instances. To overcome this issue, do a cleanup action before the component gets destroyed. It should be done manually in the beforeDestroy() lifecycle hook.

For example, suppose we have a fictional library named PowerGraph.js, inside our component. It creates a graph instance that displays some data on the page:

mounted() {
this.chart = new PowerGraph();
}
Here, we have to call the graph instance’s destroy() method or implement our own cleanup method:

beforeDestroy() {
this.chart.destroy();
}
If we don’t do cleanup action before our component gets destroyed, then that memory will never be released, and this will be a memory leak.