fix: support webpack v5 (#1057)

* chore(deps): update dependency webpack to v5

* chore: add a target field to generate ES5 compatible code for bundling

* test: set a target web

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Toru Kobayashi <koba0004@gmail.com>

package.json

@@ -62,7 +62,7 @@
     "ts-jest": "^26.4.1",
     "ts-loader": "^8.0.5",
     "typescript": "^4.0.3",
-    "webpack": "^4.44.2"
+    "webpack": "^5.0.0"
   },
   "peerDependencies": {
     "react": "^16.13.0",

scripts/build-test.ts

@@ -6,6 +6,7 @@ const MemoryFS = require('memory-fs')
 const compiler = webpack({
   mode: 'development',
   entry: path.resolve('src', 'index.ts'),
+  target: ['web', 'es5'],
   devtool: 'nosources-source-map',
   plugins: [new ECMAVersionValidatorPlugin()],
   resolve: {