From 664e2d5e5a5d0d2c3f8c984012f9f0761b7f2024 Mon Sep 17 00:00:00 2001
From: Lindsay Gaines <hello@lindsaygain.es>
Date: Thu, 24 Oct 2024 01:12:36 +1100
Subject: [PATCH] Add esm build configuration and package.json exports (#201)

This will build a cjs compatible bundle and an esm compatible bundle and package them both, allowing downstream projects to import the module type that fits their project.
---
 package.json       | 16 +++++++++++++---
 tsconfig.base.json | 13 +++++++++++--
 tsconfig.cjs.json  |  8 ++++++++
 tsconfig.esm.json  |  8 ++++++++
 4 files changed, 40 insertions(+), 5 deletions(-)
 create mode 100644 tsconfig.cjs.json
 create mode 100644 tsconfig.esm.json

diff --git a/package.json b/package.json
index e42385f..c067c99 100644
--- a/package.json
+++ b/package.json
@@ -17,10 +17,20 @@
         "type": "git",
         "url": "https://github.com/jscheiny/safe-units.git"
     },
-    "main": "dist/src/index.js",
-    "typings": "dist/src/index.d.ts",
+    "main": "./dist/cjs/index.js",
+    "module": "./dist/esm/index.js",
+    "types": "./dist/types/index.d.ts",
+    "exports": {
+        "import": "./dist/esm/index.js",
+        "require": "./dist/cjs/index.js"
+    },
+    "files": [
+        "dist"
+    ],
     "scripts": {
-        "build": "tsc -p src",
+        "build:cjs": "tsc -p tsconfig.cjs.json && echo '{\"type\":\"commonjs\"}' > dist/cjs/package.json",
+        "build:esm": "tsc -p tsconfig.esm.json && echo '{\"type\":\"module\"}' > dist/esm/package.json",
+        "build": "yarn run build:cjs && yarn run build:esm",
         "clean": "rimraf dist docs/build",
         "compile:docs": "tsc -p docsgen",
         "compile:examples": "tsc -p docs/examples",
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 4e8ae51..971b37f 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -1,7 +1,8 @@
 {
     "compilerOptions": {
-        "module": "commonjs",
         "moduleResolution": "node",
+        "declaration": true,
+        "declarationDir": "./dist/types",
         "noFallthroughCasesInSwitch": true,
         "noImplicitAny": true,
         "noImplicitReturns": true,
@@ -18,5 +19,13 @@
             "es2015",
             "es2015.core"
         ]
-    }
+    },
+    "include": [
+        "src"
+    ],
+    "exclude": [
+        "dist",
+        "node_modules",
+        "test"
+    ]
 }
\ No newline at end of file
diff --git a/tsconfig.cjs.json b/tsconfig.cjs.json
new file mode 100644
index 0000000..8411f0d
--- /dev/null
+++ b/tsconfig.cjs.json
@@ -0,0 +1,8 @@
+{
+    "extends": "./tsconfig.base.json",
+    "compilerOptions": {
+        "module": "commonjs",
+        "outDir": "./dist/cjs",
+        "target": "ES2015"
+    }
+}
\ No newline at end of file
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
new file mode 100644
index 0000000..d6aae5e
--- /dev/null
+++ b/tsconfig.esm.json
@@ -0,0 +1,8 @@
+{
+    "extends": "./tsconfig.base.json",
+    "compilerOptions": {
+        "module": "es6",
+        "outDir": "./dist/esm",
+        "target": "es6"
+    }
+}
\ No newline at end of file