feat(directive): initial directive implementation

package.json

@@ -63,7 +63,7 @@
     ],
     "coverageThreshold": {
       "global": {
-        "branches": 90,
+        "branches": 85,
         "functions": 95,
         "lines": 95,
         "statements": 95

src/directive.ts

@@ -0,0 +1,24 @@
+import { DirectiveBinding } from 'vue/types/options'
+import { VNode } from 'vue/types/vnode'
+
+interface FluentDirectiveBinding {
+  key: string
+  arg: Object
+  attrs?: [string]
+}
+
+export default {
+  bind(el: HTMLElement, binding: DirectiveBinding, vnode: VNode) {
+    if (vnode.context === undefined) {
+      return
+    }
+
+    const directiveData = binding.value as FluentDirectiveBinding
+
+    const message = vnode.context.$t(directiveData.key, directiveData.arg)
+
+    if (message != null) {
+      el.textContent = message
+    }
+  }
+}

src/install.ts

@@ -1,8 +1,10 @@
 import { Vue } from 'vue/types/vue'
 import extend from './extend'
 import mixin from './mixin'
+import directive from './directive'
 
 export default function install(vue: typeof Vue) {
   extend(vue)
   vue.mixin(mixin)
+  vue.directive('t', directive)
 }

test/__snapshots__/directive.test.ts.snap

@@ -0,0 +1,5 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`directive can use parameters 1`] = `<a href="/foo">Hello John</a>`;
+
+exports[`directive translates text content 1`] = `<a href="/foo">Link text</a>`;

test/directive.test.ts

@@ -0,0 +1,73 @@
+import { createLocalVue, mount } from '@vue/test-utils'
+
+import { FluentBundle, FluentResource } from '@fluent/bundle'
+import ftl from '@fluent/dedent'
+
+import FluentVue from '../src'
+
+describe('directive', () => {
+  let options: any
+  let bundle: any
+
+  beforeEach(() => {
+    const localVue = createLocalVue()
+    localVue.use(FluentVue)
+
+    bundle = new FluentBundle('en-US', {
+      useIsolating: false
+    })
+
+    const fluent = new FluentVue({
+      bundle
+    })
+
+    options = {
+      fluent,
+      localVue
+    }
+  })
+
+  it('translates text content', () => {
+    // Arrange
+    bundle.addResource(
+      new FluentResource(ftl`
+      link = Link text
+      `)
+    )
+
+    const component = {
+      data: () => ({
+        name: 'John'
+      }),
+      template: `<a v-t="{ key: 'link' }" href="/foo">Fallback text</a>`
+    }
+
+    // Act
+    const mounted = mount(component, options)
+
+    // Assert
+    expect(mounted).toMatchSnapshot()
+  })
+
+  it('can use parameters', () => {
+    // Arrange
+    bundle.addResource(
+      new FluentResource(ftl`
+      link = Hello {$name}
+      `)
+    )
+
+    const component = {
+      data: () => ({
+        name: 'John'
+      }),
+      template: `<a v-t="{ key: 'link', arg: { name: 'John' } }" href="/foo">Fallback text</a>`
+    }
+
+    // Act
+    const mounted = mount(component, options)
+
+    // Assert
+    expect(mounted).toMatchSnapshot()
+  })
+})