In Vue 3, the use of provide() is restricted to the setup() function

Question

In Vue 3, the use of provide() is restricted to the setup() function

I've encountered an issue with my AppReplyToMessage component. It's supposed to send data to the AppSendMessage component in order to notify it that the message being sent is a reply. Here's how I'm implementing it: The AppReplyToMessage component:

<script setup>
import { provide } from "vue";
import AppSendMessage from "../AppSendMessage.vue";

let props = defineProps({
    message: {
        type: Object,
        required: true,
    },
});

let message = toRefs(props).message;

const replyToMessage = () => {
    const message = {
        reply: true,
    };

    provide("reply", message);
};
</script>
<template>
  <button@click="replyToMessage">
    Reply
   </button> 
</template>

In the AppSendMessage component, I'm trying to receive the data as follows:

<script setup>
  const reply = inject("reply", null);
</script>

However, I'm encountering an error message stating

[Vue warn]: provide() can only be used inside setup().

in the console.

javascript vue.js vue-composition-api

Answer 1

Answer №1

The use ofprovide

should be primarily at the top level of setup, rather than nested within another function.</p>
<p>To adhere to best practices, start by initializing an empty ref and passing it to the provide function. Then, in your <code>replyToMessage

function, update the value of the ref upon button click.

<script setup>
import { provide, ref } from "vue";

// ...

const reply = ref(null);
provide("reply", reply);

const replyToMessage = () => {
    const message = {
        reply: true,
    };

    reply.value = message;
};
</script>
<template>
  <button @click="replyToMessage">
    Reply
   </button> 
</template>

Documentation

Answer 2

The use ofprovide

should be primarily at the top level of setup, rather than nested within another function.</p>
<p>To adhere to best practices, start by initializing an empty ref and passing it to the provide function. Then, in your <code>replyToMessage

function, update the value of the ref upon button click.

<script setup>
import { provide, ref } from "vue";

// ...

const reply = ref(null);
provide("reply", reply);

const replyToMessage = () => {
    const message = {
        reply: true,
    };

    reply.value = message;
};
</script>
<template>
  <button @click="replyToMessage">
    Reply
   </button> 
</template>

Documentation

Answer 3

Answer №2

Despite the minor errors in your source code, such as forgetting to include

import { inject } from "vue"

in the AppSendMessage component, there are two significant design flaws that need attention.

Vue props should not be mutated within components as they are readonly.
The Vue warning specifies that provide() should only be called from setup() or from <setup script>.

You are currently calling setup() from a lambda function.

const replyToMessage = () => {
    const message = {
        reply: true,
    };

    provide("reply", message);
};

To address this issue, it is recommended to directly run

provide("reply", message)

from <setup script>

In addition, creating a new constant message within the lambda function that is unrelated to the message prop.

Please refer to the Vue Docs on Components and Provide / Inject for comprehensive information. You can also explore the SFC Playground with an example of Provide / Inject implementation.

For a solution, you can modify your code snippet as follows:

const reply = ref({});
provide("reply", reply);

const replyToMessage = () => {
    reply.value.message = props.message;
    reply.value.reply = true;
};

Answer 4

Despite the minor errors in your source code, such as forgetting to include

import { inject } from "vue"

in the AppSendMessage component, there are two significant design flaws that need attention.

Vue props should not be mutated within components as they are readonly.
The Vue warning specifies that provide() should only be called from setup() or from <setup script>.

You are currently calling setup() from a lambda function.

const replyToMessage = () => {
    const message = {
        reply: true,
    };

    provide("reply", message);
};

To address this issue, it is recommended to directly run

provide("reply", message)

from <setup script>

In addition, creating a new constant message within the lambda function that is unrelated to the message prop.

Please refer to the Vue Docs on Components and Provide / Inject for comprehensive information. You can also explore the SFC Playground with an example of Provide / Inject implementation.

For a solution, you can modify your code snippet as follows:

const reply = ref({});
provide("reply", reply);

const replyToMessage = () => {
    reply.value.message = props.message;
    reply.value.reply = true;
};

In Vue 3, the use of provide() is restricted to the setup() function

Answer №1

Answer №2

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