Vue is throwing an error that parameter 'value' is implicitly assigned an 'any' type in TypeScript

Can anyone assist me with how I can correctly type the 'value' variable inside data to avoid the error message - Parameter 'value' implicitly has an 'any' type?

<template>
  <v-sheet width="300" class="mx-auto">
      <v-form fast-fail @submit.prevent>
        <v-text-field
          label="First name"
          :rules="firstNameRules"
        >{{ firstName }}</v-text-field>
        <v-btn type="submit" block class="mt-2">Submit</v-btn>
      </v-form>
    </v-sheet>
</template>

<script lang="ts">
export default {
  data: () => ({
      firstName: '',
      firstNameRules: [
        value  => {
          if (value?.length > 3) return true
          return 'First name must be at least 3 characters.'
        },
      ],
    }),
  }
</script>

Answer №1

To declare a variable in TypeScript, you simply use the syntax variable: type just like you would for any other variable:

export default {
  data: () => ({
    userName: '',
    userNameRules: [
      (value: string)  => {
        if (value?.length > 3) return true
        return 'Username must be at least 3 characters.'
      },
    ],
  }),
}

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