The 'this' context setting function is not functioning as expected

Within my Vue component, I am currently working with the following code:

import Vue from 'vue';
import { ElForm } from 'element-ui/types/form';

type Validator = (
  this: typeof PasswordReset,
  rule: any,
  value: any,
  callback: (error?: Error) => void
) => void;

const validatePass1: Validator = (rule, value, callback) => {
  if (value && this.form.passwordConfirm) {
    (this.$refs.form as ElForm).validateField('passwordConfirm', valid => {});
  }
};
// ...

const PasswordReset = Vue.extend({
  // ...

The issue arises as the functionality in the validatePass1 function is not behaving as expected. A type error occurs:

'this' implicitly has type 'any' because it does not have a type annotation.

It's puzzling why this error is occurring.

Answer №1

definePasswordChecker must be declared using the function keyword, not as an arrow function. Arrow functions do not take into account the 'this' parameter passed during the call (which is what your type annotation relies on) and instead always reference the 'this' from their defining scope, which in this scenario appears to be the global object.

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