Mastering the utilization of the Data object in VueJS with Decorators can be tricky. One common error message you might encounter is, "Class method 'data' expected 'this' to be used."

Question

Mastering the utilization of the Data object in VueJS with Decorators can be tricky. One common error message you might encounter is, "Class method 'data' expected 'this' to be used."

Error > The class method 'data' should use 'this' but it is not.

I encountered this issue and believed I fixed it as shown below: TypeScript Unexpected token, A constructor, method, accessor or property was expected

<script lang="ts">
import { Component, Prop, Vue } from 'vue-property-decorator'
import { MOON_HOLDINGS_LINK, TWITTER_LINK } from '@/constants/links'

@Component
export default class HelloWorld extends Vue {
  @Prop() private title!: string

  data(): any {
    return {
      moonLink: MOON_HOLDINGS_LINK,
    }
  }
}
</script>

https://i.sstatic.net/6Wn5O.png

javascript vue.js vuejs2 decorator

Answer 1

Answer №1

ESLint's class-methods-use-this rule is responsible for this behavior.

In most cases, the use of this in the data() method is not necessary.

To address this issue, you can suppress the warning for the specific method. This exemption is mentioned in ESLint documentation as an exception to the rule:

For instance, if you need to override a method from an external library as a regular function without using this, it could be considered an exception.

To implement this fix, you would add the following configuration:

/*eslint class-methods-use-this: ["error", { "exceptMethods": ["data"] }] */

Here is an example demonstrating how to apply this configuration:

<script lang="ts">
import { Component, Prop, Vue } from 'vue-property-decorator'
import { MOON_HOLDINGS_LINK, TWITTER_LINK } from '@/constants/links'

@Component
export default class HelloWorld extends Vue {
  @Prop() private title!: string

  /*eslint class-methods-use-this: ["error", { "exceptMethods": ["data"] }] */
  data(): any {
    return {
      moonLink: MOON_HOLDINGS_LINK,
    }
  }
}
</script>

Answer 2

ESLint's class-methods-use-this rule is responsible for this behavior.

In most cases, the use of this in the data() method is not necessary.

To address this issue, you can suppress the warning for the specific method. This exemption is mentioned in ESLint documentation as an exception to the rule:

For instance, if you need to override a method from an external library as a regular function without using this, it could be considered an exception.

To implement this fix, you would add the following configuration:

/*eslint class-methods-use-this: ["error", { "exceptMethods": ["data"] }] */

Here is an example demonstrating how to apply this configuration:

<script lang="ts">
import { Component, Prop, Vue } from 'vue-property-decorator'
import { MOON_HOLDINGS_LINK, TWITTER_LINK } from '@/constants/links'

@Component
export default class HelloWorld extends Vue {
  @Prop() private title!: string

  /*eslint class-methods-use-this: ["error", { "exceptMethods": ["data"] }] */
  data(): any {
    return {
      moonLink: MOON_HOLDINGS_LINK,
    }
  }
}
</script>

Mastering the utilization of the Data object in VueJS with Decorators can be tricky. One common error message you might encounter is, "Class method 'data' expected 'this' to be used."

Answer №1

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