Remove cjs, remove test-dependencies, replace eslint with biome

Author: aptomaKetil

.eslintrc

@@ -0,0 +1,50 @@
+{
+	"$schema": "https://biomejs.dev/schemas/2.4.6/schema.json",
+	"vcs": {
+		"enabled": false,
+		"clientKind": "git",
+		"useIgnoreFile": false
+	},
+	"files": {
+		"ignoreUnknown": false,
+		"includes": ["**", "!**/dist", "!**/coverage", "!**/.nyc_output", "!**/.claude", "!**/benchmarks"]
+	},
+	"formatter": {
+		"enabled": true,
+		"indentStyle": "tab",
+		"lineWidth": 120
+	},
+	"assist": {
+		"actions": {
+			"source": {
+				"organizeImports": "on"
+			}
+		}
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true,
+			"correctness": {
+				"noUnusedImports": "error",
+				"noUnusedFunctionParameters": "off"
+			},
+			"performance": {
+				"noDelete": "off"
+			},
+			"complexity": {
+				"noForEach": "off"
+			},
+			"suspicious": {
+				"noFocusedTests": "error"
+			}
+		}
+	},
+	"javascript": {
+		"formatter": {
+			"quoteStyle": "single",
+			"bracketSpacing": false,
+			"trailingCommas": "none"
+		}
+	}
+}