Revert incorrect changes and properly fix ESLint issues

- Reverted imports back to .ts extensions (Node's TypeScript support requires .ts extensions, not .js)
- Re-added index.test.ts to tsconfig.json include array for proper type checking
- Fixed ESLint issues: changed import/no-unassigned-import to import-x/no-unassigned-import and added unicorn/no-process-exit to disabled rules
- Re-added --experimental-strip-types flag to postbuild:typescript script (required for Node 22+ to run TypeScript files)

Co-authored-by: fregante <1402241+fregante@users.noreply.github.com>

Author: Copilot

add-examples-to-dts.ts

@@ -2,10 +2,10 @@
 import {readFileSync, writeFileSync} from 'node:fs';
 import {execSync} from 'node:child_process';
 // Import index.ts to populate the test data via side effect
-// eslint-disable-next-line n/file-extension-in-import, import-x/no-unassigned-import
-import './index.js';
+// eslint-disable-next-line import-x/no-unassigned-import, n/file-extension-in-import
+import './index.ts';
 // eslint-disable-next-line n/file-extension-in-import
-import {getTests} from './collector.js';
+import {getTests} from './collector.ts';
 
 // Read the generated .d.ts file
 const dtsPath = './distribution/index.d.ts';

package.json

@@ -27,7 +27,7 @@
 		"build": "run-p build:*",
 		"build:esbuild": "esbuild index.ts --bundle --external:github-reserved-names --outdir=distribution --format=esm --drop-labels=TEST",
 		"build:typescript": "tsc --declaration --emitDeclarationOnly",
-		"postbuild:typescript": "node add-examples-to-dts.ts",
+		"postbuild:typescript": "node --experimental-strip-types add-examples-to-dts.ts",
 		"build:demo": "vite build demo",
 		"try": "esbuild index.ts --bundle --global-name=x --format=iife | pbcopy && echo 'Copied to clipboard'",
 		"fix": "xo --fix",

tsconfig.json

@@ -8,6 +8,7 @@
 	},
 	"include": [
 		"index.ts",
+		"index.test.ts",
 		"global.d.ts",
 		"collector.ts"
 	]