fix: Enable generation of ESM so that it can be used with native imports

.eslintrc.json

@@ -0,0 +1,23 @@
+{
+  "plugins":[
+    "es5"
+  ],
+  "rules":{
+    "es5/no-for-of":"error",
+    "es5/no-generators":"error",
+    "es5/no-typeof-symbol":"error",
+    "es5/no-es6-methods":"error",
+    "es5/no-es6-static-methods":[
+      "error",
+      {
+        "exceptMethods":[
+          "Object.assign"
+        ]
+      }
+    ],
+    "no-restricted-syntax":[
+      "error",
+      "ForInStatement"
+    ]
+  }
+}

.github/workflows/main.yml

@@ -42,7 +42,7 @@ jobs:
         run: yarn build
 
       - name: Run benchmark
-        run: node benchmark.js | tee output.txt
+        run: yarn benchmark
         env:
           NODE_ENV: production
 

.gitignore

@@ -1,3 +1,6 @@
 node_modules
 dist
 coverage
+output.txt
+yarn-error.log
+benchmark.mjs

benchmark.js

@@ -1,5 +1,5 @@
-const Benchmark = require('benchmark');
-const SuperJSON = require('./dist/').default;
+import Benchmark from 'benchmark';
+import SuperJSON from './dist/index.js';
 
 const instances = {
   'toy example': {

package.json

@@ -1,8 +1,10 @@
 {
   "version": "1.7.2",
   "license": "MIT",
-  "main": "dist/index.js",
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
   "typings": "dist/index.d.ts",
+  "type": "module",
   "files": [
     "dist",
     "src"
@@ -11,11 +13,13 @@
     "node": ">=10"
   },
   "scripts": {
-    "build": "tsc",
+    "clean": "rm -rf ./dist",
+    "benchmark": "./scripts/benchmark",
+    "build": "./scripts/build",
     "test": "tsdx test --notify --verbose",
     "lint": "tsdx lint",
-    "prepack": "tsc",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "prepublishOnly": "npm run build"
   },
   "importSort": {
     ".ts": {
@@ -46,7 +50,6 @@
       "url": "https://twitter.com/flybayer"
     }
   ],
-  "module": "dist/superjson.esm.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/blitz-js/superjson"
@@ -60,12 +63,14 @@
     "husky": "^5.0.9",
     "mongodb": "^3.6.4",
     "tsdx": "^0.14.1",
+    "tsup": "^4.0.0",
     "typescript": "^4.1.5"
   },
   "dependencies": {
     "debug": "^4.3.1"
   },
   "resolutions": {
+    "**/eslint": "^7.17.0",
     "**/@typescript-eslint/eslint-plugin": "^4.11.1",
     "**/@typescript-eslint/parser": "^4.11.1",
     "**/jest": "^26.6.3",

scripts/benchmark

@@ -0,0 +1,12 @@
+#!/bin/bash
+currentver="$(node --version)"
+requiredver="v12.0.0"
+
+if [ "$(printf '%s\n' "$requiredver" "$currentver" | sort -V | head -n1)" = "$requiredver" ]; then
+  echo "Benchmarking ESM"
+  node benchmark.js | tee output.txt
+else
+  echo "Benchmarking CJS"
+  cp benchmark.js benchmark.mjs
+  node --experimental-modules benchmark.mjs | tee output.txt
+fi

scripts/build

@@ -0,0 +1,11 @@
+#!/bin/bash
+currentver="$(node --version)"
+requiredver="v12.0.0"
+
+if [ "$(printf '%s\n' "$requiredver" "$currentver" | sort -V | head -n1)" = "$requiredver" ]; then
+  echo "Building with tsup"
+  node --experimental-worker ./node_modules/.bin/tsup src/index.ts --dts --sourcemap --target es5 --format cjs,esm
+else
+  echo "Fallback to tsc"
+  ./node_modules/.bin/tsc && cp dist/index.js dist/index.cjs
+fi

tsconfig.json

@@ -1,21 +1,29 @@
 {
   "include": ["src"],
-  "exclude": ["**/*.spec.ts", "**/*.test.ts"],
   "compilerOptions": {
+    "target": "es5",
     "module": "CommonJS",
     "lib": ["esnext"],
-    "importHelpers": false,
-    "declaration": true,
-    "sourceMap": true,
     "rootDir": "./src",
     "outDir": "./dist",
-    "strict": true,
+    "declaration": true,
+    "sourceMap": true,
+    "importHelpers": false,
+    "downlevelIteration": true,
+    "esModuleInterop": true,
+    "moduleResolution": "Node",
     "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "moduleResolution": "node",
-    "esModuleInterop": true,
-    "downlevelIteration": true
-  }
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "strictNullChecks": true
+  },
+  "exclude": [
+    "**/dist",
+    "**/node_modules",
+    "**/test",
+    "**/*.spec.ts",
+    "**/*.test.ts"
+  ]
 }