Migrate to ESLint 9

eslint.config.mjs

@@ -0,0 +1,19 @@
+// @ts-check
+
+import { configs } from "@js-soft/eslint-config-ts"
+import { globalIgnores } from "eslint/config"
+import tseslint from "typescript-eslint"
+
+export default tseslint.config(globalIgnores(["**/dist", "**/node_modules"]), {
+    extends: [configs.base, configs.mocha],
+    languageOptions: {
+        parserOptions: {
+            project: ["./tsconfig.json", "example/tsconfig.json"]
+        }
+    },
+    files: ["**/*.ts"],
+    rules: {
+        "no-console": "off",
+        "jest/expect-expect": "off"
+    }
+})

example/test/test.ts

@@ -1,4 +1,4 @@
-function sleep(ms: number = 500): Promise<void> {
+function sleep(ms = 500): Promise<void> {
     if (ms <= 0) throw new Error("Please enter a positive value greater than 0.")
 
     return new Promise((resolve) => {
@@ -16,11 +16,11 @@ describe("Long running tests", function () {
 
 const testVar = process.env.TEST_VAR
 describe("env var mounting", function () {
-    it("should mount env vars on the root", async function () {
-        if (testVar != "test") throw new Error("TEST_VAR is not set to 'test'")
+    it("should mount env vars on the root", function () {
+        if (testVar !== "test") throw new Error("TEST_VAR is not set to 'test'")
     })
 
-    it("should mount env vars", async function () {
-        if (process.env.TEST_VAR != "test") throw new Error("TEST_VAR is not set to 'test'")
+    it("should mount env vars", function () {
+        if (process.env.TEST_VAR !== "test") throw new Error("TEST_VAR is not set to 'test'")
     })
 })

example/tsconfig.json

@@ -1,5 +1,6 @@
 {
     "compilerOptions": {
+        "strictNullChecks": true,
         "lib": ["es2015", "dom"],
         "baseUrl": "."
     }