Add lint-staged, husky for formatting during commits

ui/.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged ui/

ui/lint-staged.config.js

@@ -0,0 +1,13 @@
+// lint-staged configuration for next 12
+// from https://nextjs.org/docs/basic-features/eslint#lint-staged
+const path = require('path')
+
+const buildEslintCommand = (filenames) =>
+ `next lint --fix --file ${filenames
+ .map((f) => path.relative(process.cwd(), f))
+ .join(' --file ')}`
+
+module.exports = {
+ '*.{js,jsx,ts,tsx}': [buildEslintCommand], // eslint
+ '*': 'prettier --ignore-unknown --write', // prettier
+}