build(packages): emit ESM type marker, drop source export condition (#8)

- Add scripts/write-esm-package-json.js to write dist/esm/package.json
  with {"type":"module"} as a postbuild step. Required so bundlers
  (webpack, esbuild, vite, rollup) and older Node parse the ESM build
  as modules rather than CJS.
- Drop "source": "./src/index.ts" from each package's exports map.
  Source files are not shipped in dist/, so this condition pointed at
  nothing in the published tarball.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: yyyyaaa

packages/agent/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

packages/agentic-kit/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

packages/anthropic/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

packages/ollama/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

packages/openai/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

packages/react/package.json

@@ -8,7 +8,6 @@
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "source": "./src/index.ts",
       "types": "./index.d.ts",
       "import": "./esm/index.js",
       "require": "./index.js"
@@ -31,6 +30,7 @@
     "clean": "makage clean",
     "prepack": "npm run build",
     "build": "makage build",
+    "postbuild": "node ../../scripts/write-esm-package-json.js",
     "build:dev": "makage build --dev",
     "lint": "eslint . --fix",
     "test": "jest",

scripts/write-esm-package-json.js

@@ -0,0 +1,11 @@
+#!/usr/bin/env node
+// Writes dist/esm/package.json with {"type":"module"} so Node treats the
+// ESM build's .js files as modules. Runs from each package's cwd as a
+// postbuild step.
+
+const fs = require('node:fs');
+const path = require('node:path');
+
+const target = path.join('dist', 'esm', 'package.json');
+fs.mkdirSync(path.dirname(target), { recursive: true });
+fs.writeFileSync(target, '{"type":"module"}\n');