feat(precommit): Update precommit script

Update precommit script to newer version lint-staged which provides a way to explicitly provide a
config file. This means the cosmicconfig hack is not needed anymore.

src/scripts/precommit.js

@@ -0,0 +1,42 @@
+const path = require('path');
+const spawn = require('cross-spawn');
+const {
+  isOptedIn,
+  resolveBin,
+  hasFile,
+  hasPkgProp,
+  getPackageManagerBin,
+} = require('../utils');
+
+const here = p => path.join(__dirname, p);
+const hereRelative = p => here(p).replace(process.cwd(), '.');
+
+const [, , ...args] = process.argv;
+
+const useBuiltinConfig =
+  !args.includes('--config') &&
+  !hasFile('.lintstagedrc') &&
+  !hasFile('lintstaged.config.js') &&
+  !hasPkgProp('lintstaged');
+
+const config = useBuiltinConfig
+  ? ['--config', hereRelative('../config/lintstagedrc.js')]
+  : [];
+
+const lintStagedResult = spawn.sync(resolveBin('lint-staged'), [...config], {
+  stdio: 'inherit',
+});
+
+if (lintStagedResult.status !== 0 || !isOptedIn('pre-commit')) {
+  process.exit(lintStagedResult.status);
+} else {
+  const validateResult = spawn.sync(
+    getPackageManagerBin(),
+    ['run', 'validate'],
+    {
+      stdio: 'inherit',
+    },
+  );
+
+  process.exit(validateResult.status);
+}

src/utils.js

@@ -143,6 +143,17 @@ function isOptedIn(key, t = true, f = false) {
   return contents.includes(key) ? t : f;
 }
 
+const getPackageManagerBin = () => {
+  try {
+    resolveBin('yarn');
+  } catch (err) {
+    return 'npm';
+  }
+
+  if (hasFile('yarn.lock')) return 'yarn';
+  return 'npm';
+};
+
 module.exports = {
   appDirectory,
   envIsSet,
@@ -163,4 +174,5 @@ module.exports = {
   pkg,
   resolveBin,
   resolveFransScripts,
+  getPackageManagerBin,
 };