migrate to webpack5

Author: gfx

package.json

@@ -12,7 +12,7 @@
   "sideEffects": false,
   "scripts": {
     "build": "npm publish --dry-run",
-    "prepare": "npm run clean && webpack && tsc --build tsconfig.dist.json tsconfig.dist.es5+esm.json && ts-node tools/esmify.ts dist.es5+esm/*.js dist.es5+esm/*/*.js",
+    "prepare": "npm run clean && webpack --bail && tsc --build tsconfig.dist.json tsconfig.dist.es5+esm.json && ts-node tools/esmify.ts dist.es5+esm/*.js dist.es5+esm/*/*.js",
     "prepublishOnly": "run-p 'test:dist:*' && npm run test:browser",
     "clean": "rimraf build dist dist.*",
     "test": "mocha 'test/**/*.test.ts'",
@@ -84,7 +84,7 @@
     "tsconfig-paths": "latest",
     "typescript": "latest",
     "web-streams-polyfill": "latest",
-    "webpack": "^4",
+    "webpack": "latest",
     "webpack-cli": "latest"
   },
   "dependencies": {},

webpack.config.ts

@@ -1,5 +1,4 @@
 import path from "path";
-// @ts-expect-error
 import webpack from "webpack";
 import _ from "lodash";
 // @ts-expect-error
@@ -9,6 +8,7 @@ const config = {
   mode: "production",
 
   entry: "./src/index.ts",
+  target: ["web", "es5"],
   output: {
     path: path.resolve(__dirname, "dist.es5+umd"),
     library: "MessagePack",
@@ -42,7 +42,6 @@ const config = {
   ],
 
   optimization: {
-    noEmitOnErrors: true,
     minimize: undefined as boolean | undefined,
   },