useScript.ts

import {  onMounted, ref } from 'vue';

interface ScriptOptions { 
  src: string;
}

export function useScript(opts: ScriptOptions) { 
  const isLoading = ref(false);
  const error = ref(false);
  const success = ref(false);

  const promise = new Promise((resolve, reject) => { 
    onMounted(() => { 
      const script = document.createElement('script');
      script.type = 'text/javascript';
      script.onload = function () { 
        isLoading.value = false;
        success.value = true;
        error.value = false;
        resolve('');
      };

      script.onerror = function (err) { 
        isLoading.value = false;
        success.value = false;
        error.value = true;
        reject(err);
      };

      script.src = opts.src;
      document.head.appendChild(script);
    });
  });

  return { 
    isLoading,
    error,
    success,
    toPromise: () => promise,
  };
}

.vue

setup(){ 
      const {  toPromise } = useScript({ 
        src: 'https://cdn.bootcdn.net/ajax/libs/....',
      });
      
      function init() { 
        toPromise().then(() => { 
          setTimeout(() => { 
            initEditor();
          }, 0);
        });
      }

      onMountedOrActivated(() => { 
        nextTick(() => { 
          init();
        });
      });

onMountedOrActivated.ts

import {  nextTick, onMounted, onActivated } from 'vue';

export function onMountedOrActivated(hook: Fn) { 
  let mounted: boolean;

  onMounted(() => { 
    hook();
    nextTick(() => { 
      mounted = true;
    });
  });

  onActivated(() => { 
    if (mounted) { 
      hook();
    }
  });
}