From 4ed3733a0e0fb2845cbcacbc2907bce57f6a38bf Mon Sep 17 00:00:00 2001
From: Vincent Driessen <me@nvie.com>
Date: Thu, 6 Feb 2025 00:40:58 +0100
Subject: [PATCH] Drop CJS support, make it ESM-only

---
 CHANGELOG.md   | 10 ++++++++++
 package.json   | 11 ++---------
 tsup.config.ts |  2 +-
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c28d4c7..9a09ce11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 ## [Unreleased]
 
+- Drops CJS support in favor of ESM only
+
+```tsx
+// ❌ No longer supported
+const { string } = require('decoders');
+
+// ✅ Use import instead
+import { string } from 'decoders';
+```
+
 ## [2.6.0] - 2025-02-04
 
 - Implement the [Standard Schema](https://standardschema.dev/) specification.
diff --git a/package.json b/package.json
index f98dee14..a29052a8 100644
--- a/package.json
+++ b/package.json
@@ -13,19 +13,12 @@
     "url": "https://github.com/nvie/decoders/issues"
   },
   "type": "module",
-  "main": "./dist/index.cjs",
-  "module": "./dist/index.js",
-  "types": "./dist/index.d.cts",
+  "main": "./dist/index.js",
   "exports": {
     ".": {
       "import": {
         "types": "./dist/index.d.ts",
         "default": "./dist/index.js"
-      },
-      "require": {
-        "types": "./dist/index.d.cts",
-        "module": "./dist/index.js",
-        "default": "./dist/index.cjs"
       }
     }
   },
@@ -40,7 +33,7 @@
     "docs": "cog -cr docs/*.md",
     "lint": "eslint --color --report-unused-disable-directives src/ test/ && prettier --list-different src/ test/ test-d/",
     "lint:docs": "cog -c --check docs/*.md || (npm run docs; git diff; echo 'Error: docs not up-to-date, please re-run \"npm docs\" to update them.' && exit 1)",
-    "lint:package": "publint --strict && attw --pack",
+    "lint:package": "publint --strict && attw --pack --profile esm-only",
     "format": "eslint --color --report-unused-disable-directives --fix src/ test/ ; prettier --write src/ test/ test-d/",
     "test": "vitest run --coverage",
     "test:completeness": "./bin/check.sh",
diff --git a/tsup.config.ts b/tsup.config.ts
index 22f735b6..13477bd2 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -6,5 +6,5 @@ export default defineConfig({
   splitting: true,
   clean: true,
   // target: /* what tsconfig specifies */,
-  format: ['esm', 'cjs'],
+  format: ['esm'],
 });