feat: added typescript support and updated docs accordingly (#94)

* feat: added typescript support and updated docs accordingly

* feat: added typescript support and updated docs accordingly

* fix: added a line to the README about typescript support

* fix: added "types" field in package.json

* added store module declaration

Co-authored-by: Daniel Roe <daniel@roe.dev>

* refactored user type into a Record

Co-authored-by: Daniel Roe <daniel@roe.dev>

* fix: linted code samples in the docs, refactored NuxtStrapiQueryParams into a Record type

* fix: removed line from index.md about ts, added declaration for NuxtAppOptions

* fix: made a link in the ts page relative to the current url; removed declaration imports

Co-authored-by: Daniel Roe <daniel@roe.dev>

.eslintignore

@@ -6,3 +6,6 @@ coverage
 
 # Plugin
 lib/plugin.js
+
+# Typings
+/**/*.d.ts

README.md

@@ -20,6 +20,7 @@
 - RESTful methods
 - Adaptive SDK for API entities
 - Handle errors with hooks
+- TypeScript support
 
 [📖  Read the documentation](https://strapi.nuxtjs.org)
 

docs/content/en/index.md

@@ -8,6 +8,7 @@ features:
   - RESTful methods
   - Adaptive SDK for API entities
   - Handle errors with hooks
+  - TypeScript support
 ---
 
 <img src="/preview.png" class="light-img" width="1280" height="640" alt=""/>

docs/content/en/proxy.md

@@ -1,7 +1,7 @@
 ---
 title: Using a proxy
 description: 'Use Strapi behind a proxy with Nuxt Proxy module'
-position: 7
+position: 8
 category: Advanced
 fullscreen: true
 ---

docs/content/en/typescript.md

@@ -0,0 +1,155 @@
+---
+title: Usage with Typescript
+description: 'Discover how you can setup your project to integrate Strapi with TypeScript'
+position: 7
+category: Advanced
+---
+
+## Setup
+
+Thanks to [declaration merging](https://www.typescriptlang.org/docs/handbook/declaration-merging.html),
+you can tell the TypeScript compiler where to find the `$strapi` types by adding these lines to your 
+`tsconfig.json`.
+
+```json[tsconfig.json]
+{
+  "compilerOptions": {
+    "types": [
+      "@nuxtjs/strapi"
+    ]
+  }
+}
+```
+
+## Usage
+
+You now have access to `this.$strapi` inside your components and to `ctx.$strapi` inside 
+`asyncData`, `fetch`, `plugins`, `middlewares` and `nuxtServerInit`.
+
+### In component methods
+```vue
+<script lang="ts">
+import Vue from 'vue'
+
+interface BlogPost {
+  title: string;
+  description: string;
+}
+
+export default Vue.extend({
+  async data () {
+    const post = await this.$strapi.create<BlogPost>(
+      'posts',
+      {
+        title: 'Welcome to Strapi',
+        description: 'Strapi is awesome!'
+      }
+    )
+
+    return {
+      post
+    }
+  }
+})
+</script>
+```
+
+> Notice how you can define the type of the query parameters and of the returned value using generics.
+
+### Inside methods that use `context`
+```vue
+<script lang="ts">
+import Vue from 'vue'
+import { Context } from '@nuxt/types'
+
+interface BlogPost {
+  title: string;
+  description: string;
+}
+
+export default Vue.extend({
+  async asyncData (ctx: Context) {
+    const posts = await ctx.$strapi.find<BlogPost[]>(
+      'posts'
+    )
+
+    return {
+      posts
+    }
+  }
+})
+</script>
+```
+
+## Known issues
+
+There are some known issues with the current implementation of TypeScript in the library,
+so we have listed some workarounds.
+
+### Entity shortcuts
+
+The current TypeScript implementation doesn't support entity shortcuts: your code may work,
+but it will throw type checking errors. This is why we made the `entity` parameter needed in
+every method which involves a query.
+
+You can however define the entities available to your Vue methods with
+[string literal types](https://www.typescriptlang.org/docs/handbook/literal-types.html#string-literal-types)
+as described below.
+
+```vue
+<script lang="ts">
+import Vue from 'vue'
+import { Context } from '@nuxt/types'
+
+interface BlogPost {
+  title: string;
+  description: string;
+}
+
+type Entities = 'posts' | 'projects'
+
+export default Vue.extend({
+  async asyncData (ctx: Context) {
+    const posts = await ctx.$strapi.find<BlogPost[], Entities>(
+      'posts'
+    )
+
+    return {
+      posts
+    }
+  }
+})
+</script>
+```
+
+### Query params
+
+Some query methods won't be accepted by the compiler if you define generics as in `$strapi.find<BlogPost[]>`
+(e.g.: the array methods described [here](/strapi#findentity-params)).
+
+You can get around this issue by doing something like below.
+
+```vue
+<script lang="ts">
+import Vue from 'vue'
+
+interface BlogPost {
+  title: string;
+  description: string;
+}
+
+export default Vue.extend({
+  async asyncData (ctx: Context) {
+    const posts: BlogPost[] = await this.$strapi.find(
+      'posts'
+    )
+
+    return {
+      posts
+    }
+  }
+})
+</script>
+```
+
+> You can always declare the return type by assigning a type to the variable instead of the method.

lib/index.d.ts

@@ -0,0 +1,168 @@
+import { NuxtHTTPInstance } from '@nuxt/http';
+import { NuxtCookies } from 'cookie-universal-nuxt';
+
+type NuxtStrapiQueryParams<T> = T | Record<string, any>;
+
+interface NuxtStrapiGraphQLParams {
+  query: string;
+}
+
+interface NuxtStrapiRegistrationData {
+  username: string;
+  email: string;
+  password: string;
+}
+
+interface NuxtStrapiLoginData {
+  /**
+   * Can be either the email or the username set by the user.
+   * */
+  identifier: string;
+  password: string;
+}
+
+interface NuxtStrapiEmailData {
+  email: string;
+}
+
+interface NuxtStrapiResetPasswordData {
+  code: string;
+  password: string;
+  passwordConfirmation: string;
+}
+
+export interface NuxtStrapi {
+  /**
+   * Use this object to access details about the
+   * authenticated user or to directly set a user prop.
+   * */
+  user: Record<string, any>;
+
+  /**
+   * Get entries.
+   * Returns entries matching the query filters.
+   * You can read more about parameters
+   * [here](https://strapi.io/documentation/developer-docs/latest/content-api/parameters.html).
+   * */
+  find<T = any, Entities = string>(entity: Entities, params?: NuxtStrapiQueryParams<T> ): Promise<T>;
+
+  /**
+   * Count entries.
+   * Returns the count of entries matching the query filters.
+   * You can read more about parameters
+   * [here](https://strapi.io/documentation/developer-docs/latest/content-api/parameters.html).
+   * */
+  count<T = any, Entities = string>(entity: Entities, params?: NuxtStrapiQueryParams<T>): Promise<number>;
+
+  /**
+   * Get an entry by id and returns its value.
+   * */
+  findOne<T = any, Entities = string>(entity: Entities, id?: string): Promise<T>;
+
+  /**
+   * Creates an entry and returns its value.
+   * */
+  create<T = any, Entities = string>(entity: Entities, data?: NuxtStrapiQueryParams<T>): Promise<T>;
+
+  /**
+   * Partially updates an entry by id and returns its value.
+   * Fields that aren't sent in the query are not changed in the db.
+   * Send a null value if you want to clear them.
+   * */
+  update<T = any, Entities = string>(entity: Entities, id: string, data?: NuxtStrapiQueryParams<T>): Promise<T>;
+
+  /**
+   * Deletes an entry by id and returns its value.
+   * */
+  delete<T = any, Entities = string>(entity: Entities, id: string): Promise<T>;
+
+  /**
+   * Performs an HTTP request to GraphQL API and returns the requested data.
+   * */
+  graphql<T = any>(data: NuxtStrapiGraphQLParams): Promise<T>;
+
+  /**
+   * Register using local strategy. Sets the User and Token.
+   * */
+  register(data: NuxtStrapiRegistrationData): Promise<void>;
+
+  /**
+   * Login using local strategy. Sets the User and Token.
+   * */
+  login(data: NuxtStrapiLoginData): Promise<void>;
+
+  /**
+   * Send a request to the forgot-password endpoint of the server.
+   * */
+  forgotPassword(data: NuxtStrapiEmailData): Promise<void>;
+
+  /**
+   * Send a request to the reset-password endpoint of the server.
+   * */
+  resetPassword(data: NuxtStrapiResetPasswordData): Promise<void>;
+
+  /**
+   * Send an email confirmation for the login.
+   * */
+  sendEmailConfirmation(data: NuxtStrapiEmailData): Promise<void>;
+
+  /**
+   * Clears the user and jwt in cookies.
+   * */
+  logout(): void;
+
+  /**
+   * Fetch me user from /users/me route if a jwt is present in the cookies.
+   * Sets the jwt inside $http. Sets the User.
+   * */
+  fetchUser<T = any>(): Promise<T>;
+
+  /**
+   * This method fully overrides the user object, avoid using it.
+   * You can use the $strapi.user property to mutate single
+   * object properties instead of overriding it completely.
+   * */
+  setUser<T = any>(user: T): void;
+
+  /**
+   * Returns jwt from cookies.
+   * */
+  getToken(): string;
+
+  /**
+   * Sets token inside $http as a jwt Bearer.
+   * Store jwt in cookies.
+   * */
+  setToken(token: string): void;
+
+  /**
+   * Remove jwt from $http and $cookies.
+   * */
+  clearToken(): void;
+
+  $http: NuxtHTTPInstance;
+
+  $cookies: NuxtCookies;
+}
+
+declare module 'vue/types/vue' {
+  interface Vue {
+    $strapi: NuxtStrapi;
+  }
+}
+
+declare module 'vuex/types/index' {
+  interface Store<S> {
+    $strapi: NuxtStrapi;
+  }
+}
+
+declare module '@nuxt/types' {
+  interface NuxtAppOptions {
+    $strapi: NuxtStrapi;
+  }
+
+  interface Context {
+    $strapi: NuxtStrapi;
+  }
+}

package.json

@@ -14,6 +14,7 @@
     "lib"
   ],
   "main": "lib/module.js",
+  "types": "lib/index.d.ts",
   "scripts": {
     "dev": "nuxt example",
     "docs": "nuxt docs",
@@ -34,6 +35,7 @@
     "@babel/preset-env": "^7.12.11",
     "@commitlint/cli": "^11.0.0",
     "@commitlint/config-conventional": "^11.0.0",
+    "@nuxt/types": "^2.14.12",
     "@nuxtjs/eslint-config": "^5.0.0",
     "@nuxtjs/module-test-utils": "latest",
     "babel-eslint": "latest",