fix(build): actually output ESM (#2678)

Author: wolfy1339

Diff for: package.json

@@ -14,8 +14,8 @@
   "license": "MIT",
   "scripts": {
     "build": "node scripts/build.mjs && tsc -p tsconfig.json",
-    "lint": "prettier --check \"{src,test}/**/*.{js,json,ts}\" \"*.{md,json}\"",
-    "lint:fix": "prettier --write \"{src,test}/**/*.{js,json,ts}\" \"*.{md,json}\"",
+    "lint": "prettier --check \"{src,test,scripts}/**/*.{js,json,ts}\" \"*.{md,json}\"",
+    "lint:fix": "prettier --write \"{src,test,scripts}/**/*.{js,json,ts,mjs}\" \"*.{md,json}\"",
     "pretest": "npm run -s lint",
     "test": "NODE_OPTIONS=\"$NODE_OPTIONS --experimental-vm-modules\" jest --coverage",
     "test:typescript": "npx tsc --noEmit --declaration --noUnusedLocals --esModuleInterop --module node16 --strict --allowImportingTsExtensions test/typescript-validate.ts"

Diff for: scripts/build.mjs

@@ -12,6 +12,9 @@ const sharedOptions = {
   minify: false,
   allowOverwrite: true,
   packages: "external",
+  platform: "neutral",
+  format: "esm",
+  target: "es2022",
 };
 
 async function main() {
@@ -22,8 +25,6 @@ async function main() {
     entryPoints: await glob(["./src/*.ts", "./src/**/*.ts"]),
     outdir: "pkg/dist-src",
     bundle: false,
-    platform: "neutral",
-    format: "esm",
     ...sharedOptions,
     sourcemap: false,
   });
@@ -39,27 +40,13 @@ async function main() {
 
   const entryPoints = ["./pkg/dist-src/index.js"];
 
-  await Promise.all([
-    // Build the a CJS Node.js bundle
-    esbuild.build({
-      entryPoints,
-      outdir: "pkg/dist-node",
-      bundle: true,
-      platform: "node",
-      target: "node18",
-      format: "cjs",
-      ...sharedOptions,
-    }),
-    // Build an ESM browser bundle
-    esbuild.build({
-      entryPoints,
-      outdir: "pkg/dist-web",
-      bundle: true,
-      platform: "browser",
-      format: "esm",
-      ...sharedOptions,
-    }),
-  ]);
+  // Build an ESM bundle
+  await esbuild.build({
+    entryPoints,
+    outdir: "pkg/dist-bundle",
+    bundle: true,
+    ...sharedOptions,
+  });
 
   // Copy the README, LICENSE to the pkg folder
   await copyFile("LICENSE", "pkg/LICENSE");
@@ -78,15 +65,19 @@ async function main() {
       {
         ...pkg,
         files: ["dist-*/**", "bin/**"],
-        main: "dist-node/index.js",
-        module: "dist-web/index.js",
-        types: "dist-types/index.d.ts",
-        source: "dist-src/index.js",
+        types: "./dist-types/index.d.ts",
+        exports: {
+          ".": {
+            types: "./dist-types/index.d.ts",
+            import: "./dist-bundle/index.js",
+            default: "./dist-bundle/index.js",
+          },
+        },
         sideEffects: false,
       },
       null,
-      2
-    )
+      2,
+    ),
   );
 }
 main();