Rework prefetch to avoid updating store slices (#178)

* Rework prefetch to avoid updating store slices
* Fix strict promise check

Author: albertogasparin

.gitignore

@@ -8,4 +8,5 @@ yarn.lock
 .local
 .idea
 .vscode
-src/webpack/__tests__/__fixtures__/webpack/output
+src/webpack/__tests__/__fixtures__/webpack/output
+.DS_Store

examples/routing-with-resources/home.tsx

@@ -26,7 +26,7 @@ export const Home = () => {
         <ul>
           {breeds.slice(0, 25).map(breed => (
             <li key={breed}>
-              <Link to={aboutRoute} query={{ name: breed }}>
+              <Link to={aboutRoute} query={{ name: breed }} prefetch="hover">
                 {breed}
               </Link>
             </li>

package.json

@@ -50,9 +50,9 @@
   },
   "scripts": {
     "build": "npm run build:clean && npm run build:types-cjs && npm run build:types-esm && npm run build:cjs && npm run build:esm",
-    "build:cjs": "babel src --out-dir build/cjs --extensions \".ts,.tsx\" --source-maps inline --ignore src/__tests__ --presets @babel/env",
+    "build:cjs": "babel src --out-dir build/cjs --extensions \".ts,.tsx\" --ignore src/__tests__ --presets @babel/env",
     "build:clean": "rm -rf ./build",
-    "build:esm": "babel src --out-dir build/esm --extensions \".ts,.tsx\" --source-maps inline --ignore src/__tests__",
+    "build:esm": "babel src --out-dir build/esm --extensions \".ts,.tsx\" --ignore src/__tests__",
     "build:types-cjs": "tsc --emitDeclarationOnly --project tsconfig.build.json --outDir build/cjs && cp src/*.flow build/cjs",
     "build:types-esm": "tsc --emitDeclarationOnly --project tsconfig.build.json --outDir build/esm && cp src/*.flow build/esm",
     "docs": "npx docsify-cli serve docs",

src/__tests__/integration/test.tsx

@@ -226,6 +226,7 @@ describe('<Router /> integration tests', () => {
         },
       },
       executing: null,
+      prefetching: null,
     });
   });
 });

src/__tests__/unit/common/utils/history/test.ts

@@ -121,7 +121,7 @@ describe('createLegacyHistory', () => {
       const history = createLegacyHistory();
       history.push(null as any);
       expect(spy).toHaveBeenCalledWith('/');
-    })
+    });
 
     it('should change location via page reload', async () => {
       const history = createLegacyHistory();
@@ -144,7 +144,7 @@ describe('createLegacyHistory', () => {
       const history = createLegacyHistory();
       history.replace(null as any);
       expect(window.history.replaceState).toHaveBeenCalledWith({}, '', '/');
-    })
+    });
 
     it('should replace location via history', () => {
       window.history.replaceState = jest.fn();