Call external Javascript function from react components

In index.html

<script type="text/javascript">
  function test(){
    alert('Function from index.html');
  }
</script>

In your component

componentWillMount() {
  window.test();
}

Try this solution to call global functions from React with TypeScript enabled:

Either in index.html or some_site.js

function pass_function(){
  alert('42');
}

Then, from your react component:

window["pass_function"]();

And, of course, you can pass a parameter:

//react
window["passp"]("react ts");

//js
function passp(someval) {
  alert(`passes parameter: ${someval}`);
}

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