1 files changed, 43 insertions, 0 deletions
diff --git a/node_modules/vuepress/lib/app/SWUpdateEvent.js b/node_modules/vuepress/lib/app/SWUpdateEvent.js
new file mode 100644
index 00000000..fe6ab31c
--- /dev/null
+++ b/node_modules/vuepress/lib/app/SWUpdateEvent.js
@@ -0,0 +1,43 @@
+export default class SWUpdateEvent {
+  constructor (registration) {
+    Object.defineProperty(this, 'registration', {
+      value: registration,
+      configurable: true,
+      writable: true
+    })
+  }
+
+  /**
+   * Check if the new service worker exists or not.
+   */
+  update () {
+    return this.registration.update()
+  }
+
+  /**
+   * Activate new service worker to work 'location.reload()' with new data.
+   */
+  skipWaiting () {
+    const worker = this.registration.waiting
+    if (!worker) {
+      return Promise.resolve()
+    }
+
+    console.log('[vuepress:sw] Doing worker.skipWaiting().')
+    return new Promise((resolve, reject) => {
+      const channel = new MessageChannel()
+
+      channel.port1.onmessage = (event) => {
+        console.log('[vuepress:sw] Done worker.skipWaiting().')
+        if (event.data.error) {
+          reject(event.data.error)
+        } else {
+          resolve(event.data)
+        }
+      }
+
+      worker.postMessage({ type: 'skip-waiting' }, [channel.port2])
+    })
+  }
+}
+