First commit

node_modules/vue-router/src/util/resolve-components.js

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+/* @flow */
+
+import { _Vue } from '../install'
+import { warn } from './warn'
+import { isError } from '../util/errors'
+
+export function resolveAsyncComponents (matched: Array<RouteRecord>): Function {
+  return (to, from, next) => {
+    let hasAsync = false
+    let pending = 0
+    let error = null
+
+    flatMapComponents(matched, (def, _, match, key) => {
+      // if it's a function and doesn't have cid attached,
+      // assume it's an async component resolve function.
+      // we are not using Vue's default async resolving mechanism because
+      // we want to halt the navigation until the incoming component has been
+      // resolved.
+      if (typeof def === 'function' && def.cid === undefined) {
+        hasAsync = true
+        pending++
+
+        const resolve = once(resolvedDef => {
+          if (isESModule(resolvedDef)) {
+            resolvedDef = resolvedDef.default
+          }
+          // save resolved on async factory in case it's used elsewhere
+          def.resolved = typeof resolvedDef === 'function'
+            ? resolvedDef
+            : _Vue.extend(resolvedDef)
+          match.components[key] = resolvedDef
+          pending--
+          if (pending <= 0) {
+            next()
+          }
+        })
+
+        const reject = once(reason => {
+          const msg = `Failed to resolve async component ${key}: ${reason}`
+          process.env.NODE_ENV !== 'production' && warn(false, msg)
+          if (!error) {
+            error = isError(reason)
+              ? reason
+              : new Error(msg)
+            next(error)
+          }
+        })
+
+        let res
+        try {
+          res = def(resolve, reject)
+        } catch (e) {
+          reject(e)
+        }
+        if (res) {
+          if (typeof res.then === 'function') {
+            res.then(resolve, reject)
+          } else {
+            // new syntax in Vue 2.3
+            const comp = res.component
+            if (comp && typeof comp.then === 'function') {
+              comp.then(resolve, reject)
+            }
+          }
+        }
+      }
+    })
+
+    if (!hasAsync) next()
+  }
+}
+
+export function flatMapComponents (
+  matched: Array<RouteRecord>,
+  fn: Function
+): Array<?Function> {
+  return flatten(matched.map(m => {
+    return Object.keys(m.components).map(key => fn(
+      m.components[key],
+      m.instances[key],
+      m, key
+    ))
+  }))
+}
+
+export function flatten (arr: Array<any>): Array<any> {
+  return Array.prototype.concat.apply([], arr)
+}
+
+const hasSymbol =
+  typeof Symbol === 'function' &&
+  typeof Symbol.toStringTag === 'symbol'
+
+function isESModule (obj) {
+  return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
+}
+
+// in Webpack 2, require.ensure now also returns a Promise
+// so the resolve/reject functions may get called an extra time
+// if the user uses an arrow function shorthand that happens to
+// return that Promise.
+function once (fn) {
+  let called = false
+  return function (...args) {
+    if (called) return
+    called = true
+    return fn.apply(this, args)
+  }
+}