Migrate to eslint (#284)

* upgrading to tslint

* more lint stuff

* more lint fixes

* all errors are gone

* reduced eslint ignores

* fixed todos

* more shenanigans

* added a few rules

.eslintignore

@@ -0,0 +1,3 @@
+node_modules
+lib
+**/*.js

.eslintrc.js

@@ -0,0 +1,36 @@
+module.exports = {
+    root: true,
+    parser: "@typescript-eslint/parser",
+    parserOptions: {
+        project: "./tsconfig.json",
+    },
+    plugins: ["@typescript-eslint", "security", "prettier"],
+    extends: [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:prettier/recommended",
+        "plugin:security/recommended",
+    ],
+    rules: {
+        "@typescript-eslint/no-inferrable-types": "off",
+        "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
+        "@typescript-eslint/space-infix-ops": "error",
+        "@typescript-eslint/switch-exhaustiveness-check": "error",
+        "@typescript-eslint/typedef": [
+            "error",
+            {
+                arrayDestructuring: true,
+                arrowParameter: true,
+                memberVariableDeclaration: true,
+                objectDestructuring: true,
+                parameter: true,
+                propertyDeclaration: true,
+                variableDeclaration: true,
+            },
+        ],
+        "@typescript-eslint/unified-signatures": "error",
+        "prettier/prettier": ["error"],
+        "security/detect-non-literal-fs-filename": "off",
+        "security/detect-object-injection": "off",
+    },
+};