Setting non-reactive values in Vue

# The Skinny

If you need non-reactive attributes on a Vue component, you can either use $options OR assigning an attribute to the Vue instance.

# $options

export default { myConstant: 'hello', computed: { usingMyConstant() { return
this.$options.myConstant }, }, };

# this.myConstant

export default { mounted() { this.myConstant = 'hello'; }, computed: {
usingMyConstant() { return this.myConstant; }, }, };

I recently came across a use case where we needed to set a non-reactive value in Vue. We could have either used $options or setting the property on the instance.

# $options

I personally like using $options because when a developer is reading the declaration or the usage of values set in $options, it is SUPER explicit.

# this.myConstant

If we need access to a value when the component is being mounted or created, we can just put a new property on the instance.

export default { mounted() { this.myConstant = asyncAvailableValue(); }, };

When reading the code in the component, we might think that were missing a data property (myConstant), because we have set a new property on the instance. If you do choose this approach, you might want to make a comment explaining that this property should not be reactive in order to prevent other developers adding it to the data function.

// This should not be a reactive property, do not put on data attr.
this.myConstant = asyncAvailableValue();

Thanks for reading