Merge pull request #622 from appsignal/use-eslint

Use ESLint

.eslintrc.js

@@ -0,0 +1,49 @@
+module.exports = {
+  env: {
+    es2018: true,
+    node: true,
+    jest: true
+  },
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:jest/recommended",
+    "plugin:prettier/recommended"
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: "latest",
+    sourceType: "module"
+  },
+  plugins: ["@typescript-eslint", "prettier", "jest"],
+  rules: {
+    "@typescript-eslint/ban-types": [
+      "error",
+      {
+        types: {
+          Function: false
+        }
+      }
+    ],
+    "@typescript-eslint/no-empty-function": [
+      "error",
+      {
+        allow: ["arrowFunctions"]
+      }
+    ],
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        argsIgnorePattern: "^_"
+      }
+    ],
+    "@typescript-eslint/no-var-requires": "off",
+    "jest/expect-expect": [
+      "warn",
+      {
+        assertFunctionNames: ["expect*"]
+      }
+    ]
+  }
+}