fix: export types for typescript (#78)

When TypeScript's module system is set to `NodeNext` (as [recommended](https://www.typescriptlang.org/tsconfig#module)), the types cannot be found because they are not present in the export map.

This change fixes the problem by adding the types to the export map.  Additionally:

- it reconfigures the "types" test fixture to:
    - use `strict` mode
    - `module: NodeNext`
    - enables lib checking (thus validating `env.d.ts`)
    - runs `tsc --build` on `npm install`
- updates `types.test.js` accordingly
- upgrades `typescript` to latest
- fix `pkg.test.mjs` to correctly reference the updated export map

package.json

@@ -6,8 +6,14 @@
   "module": "dist/env.mjs",
   "types": "dist/env.d.ts",
   "exports": {
-    "require": "./dist/env.cjs.js",
-    "import": "./dist/env.mjs"
+    "require": {
+      "default": "./dist/env.cjs.js",
+      "types": "./dist/env.d.ts"
+    },
+    "import": {
+      "default": "./dist/env.mjs",
+      "types": "./dist/env.d.ts"
+    }
   },
   "files": [
     "dist"
@@ -57,7 +63,7 @@
     "mocha": "8.4.0",
     "rollup": "1.32.1",
     "rollup-plugin-babel-minify": "9.0.0",
-    "typescript": "4.7.4",
+    "typescript": "5.1.6",
     "yorkie": "2.0.0"
   }
 }

tests/fixtures/typescript-project/package.json

@@ -4,7 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "build": "tsc"
+    "prepare": "tsc -b"
   },
   "keywords": [],
   "author": "",

tests/fixtures/typescript-project/tsconfig.json

@@ -1,3 +1,8 @@
 {
-    "compilerOptions": {}
+    "compilerOptions": {
+        "skipLibCheck": false,
+        "module": "NodeNext",
+        "strict": true,
+    },
+    "files": ["index.ts"]
 }

tests/pkg.test.mjs

@@ -5,7 +5,7 @@
 import fs from "fs";
 
 const pkg = JSON.parse(fs.readFileSync("./package.json", "utf8"));
-const url = new URL("../" + pkg.exports.import, import.meta.url);
+const url = new URL("../" + pkg.exports.import.default, import.meta.url);
 
 import(url).then(({ Env }) => {
     new Env();

tests/types.test.js

@@ -4,5 +4,5 @@
 /* eslint-disable no-console */
 
 const { execSync } = require("child_process");
-execSync("cd tests/fixtures/typescript-project && npm i && tsc --showConfig index.ts");
+execSync("cd tests/fixtures/typescript-project && npm i");
 console.log("env.d.ts load: success");