The error message "Property 'matches' does not exist on type 'EventTarget'." is displayed on the output of angular-cli

Despite no errors showing up in the Chrome console, the code is functioning properly.

 constructor() {
    window.onclick = (event: MouseEvent) => {
      if (!event.target.matches('.dropbtn')) {
        const dropdowns = document.getElementsByClassName('dropdown-content');
        let i;
        for (i = 0; i < dropdowns.length; i++) {
          const openDropdown = dropdowns[i];
          if (openDropdown.classList.contains('show')) {
            openDropdown.classList.remove('show');
          }
        }
      }
    };
  }

It seems to be related to TypeScript. Has anyone encountered this issue before?

angulartypescripteventsangular-cli

Answer №1

To quickly resolve the issue, simply modify the event type:

window.onclick = (event: any) => {

Alternatively, you can utilize type assertions to explicitly inform the compiler that it is acceptable:

window.onclick = (event: MouseEvent) => {
  const event_cast_type = event as any;
  if (!event_cast_type.target.matches('.dropbtn')) {

It's important to note that type assertions can be risky, similar to using 'any', as you are essentially overriding the compiler's knowledge of types. However, in this situation, a type assertion may be necessary to effectively address the problem at its source, which is the compiler.

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