chore: fix lint & update lockfile

package.json

@@ -40,7 +40,7 @@
     "@types/node": "^12.7.5",
     "@types/semver": "^6.0.0",
     "conventional-changelog-cli": "^2.0.23",
-    "eslint": "^6.4.0",
+    "eslint": "5.11.1",
     "eslint-plugin-jest": "^22.17.0",
     "eslint-plugin-vue-libs": "^4.0.0",
     "husky": "^3.0.5",
@@ -48,7 +48,6 @@
     "lerna": "3.16.4",
     "lint-staged": "^9.3.0",
     "minimist": "^1.2.0",
-    "typescript": "^3.6.3",
-    "all-contributors-cli": "^6.9.1"
+    "typescript": "^3.6.3"
   }
 }

packages/@vuepress/core/lib/node/__tests__/prepare/Page.spec.js

@@ -125,7 +125,7 @@ describe('Page', () => {
     test('should loop over sync enhancers', async () => {
       await page.enhance(enhancers)
 
-      return enhancers.map(enhancer => expect(enhancer.value).toBeCalled())
+      return enhancers.map(enhancer => expect(enhancer.value).toHaveBeenCalled())
     })
 
     test('should loop over sync and async enhancers', async () => {
@@ -135,7 +135,7 @@ describe('Page', () => {
       }]
       await page.enhance(mixedEnhancers)
 
-      return mixedEnhancers.map(enhancer => expect(enhancer.value).toBeCalled())
+      return mixedEnhancers.map(enhancer => expect(enhancer.value).toHaveBeenCalled())
     })
 
     test('should log when enhancing when failing', async () => {
@@ -147,7 +147,7 @@ describe('Page', () => {
           value: jest.fn().mockRejectedValue(error)
         }])
       } catch (e) {
-        expect(console.log).toBeCalledWith(error)
+        expect(console.log).toHaveBeenCalledWith(error)
       }
     })
   })

packages/@vuepress/theme-default/components/NavLinks.vue

@@ -93,6 +93,7 @@ export default {
           ? repo
           : `https://github.com/${repo}`
       }
+      return null
     },
 
     repoLabel () {

packages/@vuepress/theme-default/components/PageEdit.vue

@@ -53,6 +53,7 @@ export default {
           this.$page.relativePath
         )
       }
+      return null
     },
 
     editLinkText () {