feat: Add code coverage to the test code. (#96)

Author: jdmarshall

.gitignore

@@ -1,4 +1,6 @@
 tags
 .idea
 node_modules/
-package-lock.json
+package-lock.json
+
+coverage

.npmignore

@@ -1,2 +1,4 @@
 # We doesn't wan to publish the logo and other
 assets
+
+coverage

package.json

@@ -5,7 +5,7 @@
 	"main": "lib/index.js",
 	"types": "index.d.ts",
 	"scripts": {
-		"test": "node --test --allow-natives-syntax",
+		"test": "c8 node --test --allow-natives-syntax",
 		"test:types": "tsd -f types/types.test-d.ts",
 		"lint": "biome lint .",
 		"lint:ci": "biome ci .",
@@ -39,6 +39,10 @@
 	"devDependencies": {
 		"@biomejs/biome": "1.9.4",
 		"@types/node": "^20",
+		"c8": "^10.1.3",
 		"tsd": "^0.31.0"
+	},
+	"c8": {
+		"reporter": "lcov"
 	}
 }