TypeScript

wemake-vue-template

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Introduction

Architecture

TypeScript

We use TypeScript to statically type-check and build our frontend.
Nuxt integration
We use typescript that is bundled with Nuxt since 2.5.0 release.
So do not install anything rather than nuxt and @nuxt/typescript. And it just works.
tsconfig.json
You can modify your ts configuration inside this file. Read more about useful options here.
Declaration files
We use client/shims/*.d.ts files to store several declarations that are required for our app. Like:
@nuxt/axios that adds $axios property to vue and vuex
$style property on Vue components to support css-modules
global .vue files support for typescript
Supporting packages
We use nuxt-property-decorator to make our Vue components type-safe.
We also use vuex-class to make our state, actions, mutations, and getters typed.
Runtime checks
Sometimes you want to make some runtime type checks: inside API methods, input validations, etc.
And since TypeScript types are only allowed during static check, we cannot use them in runtime.
So, we use io-ts and io-ts-promise to build and validate runtime types.
That's how building runtime types is done:
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import * as ts from 'io-ts'
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​
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// Runtime type, that can be used for schema validation:
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export const RawComment = ts.type({
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  'id': ts.number,
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  'body': ts.string,
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  'email': ts.string,
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})
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​
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// Static TypeScript type, that can be used as a regular `type`:
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export type RawCommentType = ts.TypeOf<typeof RawComment>
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And then validating it:
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import * as ts from 'io-ts'
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import * as tPromise from 'io-ts-promise'
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​
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async function fetchComments ($axios): Promise<RawCommentType[]> {
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  const response = await $axios.get('comments')
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  // Now we are sure that `response.data` has the correct runtime type:
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  return tPromise.decode(ts.array(RawComment), response.data)
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}
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That's a powerful combination of runtime and static type checking that enforces strong contracts on data exchange and keeping it up-to-date.

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Last modified 7mo ago

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