In this article, it assumes you have the basic knowledge and understanding of:
- Nuxt js
- Vue 3: Composition API
Open your terminal and run this command
npx create-nuxt-app nuxt-ts-composition-api make sure to select TypeScript, and $axios during the selection process.
I’m not gonna go through the installation process but you can refer to the official documentation https://nuxtjs.org/docs/2.x/get-started/installation
Then install @nuxtjs/composition-api module
npm install @nuxtjs/composition-api --save
And add this inside your nuxt.config.js file,
That is all we need but for more details head over to the official docs https://composition-api.nuxtjs.org/getting-started/setup
In Nuxt without TypeScript and Composition API, the usual way of accessing the router instance is via this.$router and that gives us access to methods like
go() and etc.
But since we are using the Composition API, we will access it from
useContext() method, and it returns as the context from which we can access our Vuex store.
To access it, look at the code below:
We have to traverse into the store property then we can access the $router instance.
What about plugins like $axios, how do we access them?
When we are not using TypeScript, we can simply access it by this code
this.$axios without the IDE screaming at us that it doesn’t recognize it. But since we want to use TypeScript, it’s going to tell you it does not recognize it.
But we can access it via
useContext() method right?
Unfortunately, the Vetur VSCode extension still doesn’t recognize what is
To fix that, we create a file called
index.d.ts and put this in a directory called
types in the root directory of our project.
Right after creating the
types directory and
index.d.ts file, your root project should look similar above.
Now inside the
index.d.ts file, here we put our type declarations so that our IDE will recognize what is
$axios and what does it return.
Now that we have added type declarations, then accessing
useContext() should work now.
And now we can access to the following methods:
put() , and etc to make our HTTP requests.
For more details regarding TypeScript type declarations, you can head over to the official docs https://typescript.nuxtjs.org/cookbook/plugins/
When we have custom plugins in our Nuxt TypeScript app, we make sure to register it inside our type declaration file, I am referring to
index.d.ts , so if you were new to TypeScript, files that ends with
*.d.ts are considered as type declaration file for TypeScript.
I hope this saved you some time and trouble. That’s all I have to share, have a great day!
Full source code: https://github.com/carlomigueldy/nuxt-typescript-composition-api