move to eslint+prettier

Author: tobidelius

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": false,
+  "singleQuote": true
+}

eslint.config.mjs

@@ -0,0 +1,21 @@
+// @ts-check
+
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import prettier from 'eslint-config-prettier'
+import pluginPrettier from 'eslint-plugin-prettier'
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.strict,
+  tseslint.configs.stylistic,
+  {
+    plugins: {
+      prettier: pluginPrettier,
+    },
+    rules: {
+      'prettier/prettier': 'error',
+    },
+    extends: [prettier],
+  },
+)

setup

@@ -3,4 +3,9 @@ npm i -D typescript \
   @types/node \
   @vitest/coverage-v8 \
   vitest \
-  ts-standard
+  eslint \
+  @eslint/js \
+  typescript-eslint \
+  prettier \
+  eslint-plugin-prettier \
+  eslint-config-prettier

src/index.ts

@@ -1,3 +1,3 @@
-export default function sum (x: number, y: number): number {
+export default function sum(x: number, y: number): number {
   return x + y
 }