feat: sort prettier field

index.js

@@ -7,6 +7,7 @@ const gitHooks = require('git-hooks-list')
 
 const hasOwnProperty = (object, property) =>
   Object.prototype.hasOwnProperty.call(object, property)
+const pipe = fns => x => fns.reduce((result, fn) => fn(result), x)
 const onArray = fn => x => (Array.isArray(x) ? fn(x) : x)
 const uniq = onArray(xs => xs.filter((x, i) => i === xs.indexOf(x)))
 const sortArray = onArray(array => [...array].sort())
@@ -45,6 +46,26 @@ const sortESLintConfig = sortObjectBy([
   'reportUnusedDisableDirectives',
 ])
 
+const sortPrettierConfigKeys = onObject(config =>
+  sortObjectKeys(config, [
+    ...Object.keys(config)
+      .filter(key => key !== 'overrides')
+      .sort(),
+    'overrides',
+  ]),
+)
+const sortPrettierConfigOptions = pipe([
+  sortObject,
+  overProperty('options', sortObject),
+])
+const sortPrettierConfigOverrides = onArray(overrides =>
+  overrides.map(sortPrettierConfigOptions),
+)
+const sortPrettierConfig = pipe([
+  sortPrettierConfigKeys,
+  onObject(overProperty('overrides', sortPrettierConfigOverrides)),
+])
+
 // See https://docs.npmjs.com/misc/scripts
 const defaultNpmScripts = new Set([
   'install',
@@ -149,7 +170,7 @@ const fields = [
   { key: 'babel', over: sortObject },
   { key: 'browserslist' },
   { key: 'xo', over: sortObject },
-  { key: 'prettier', over: sortObject },
+  { key: 'prettier', over: sortPrettierConfig },
   { key: 'eslintConfig', over: sortESLintConfig },
   { key: 'eslintIgnore' },
   { key: 'stylelint' },

test.js

@@ -191,7 +191,6 @@ for (const field of [
   'browserify',
   'babel',
   'xo',
-  'prettier',
   'ava',
   'jest',
   'mocha',
@@ -295,6 +294,44 @@ testField('eslintConfig', [
   },
 ])
 
+// prettier
+const sortedPrettierConfig = sortPackageJson({
+  prettier: {
+    trailingComma: 'none',
+    z: 'z',
+    a: 'a',
+    overrides: [
+      {
+        options: {
+          trailingComma: 'all',
+          semi: false,
+          z: 'z',
+          a: 'a',
+        },
+        z: 'z',
+        a: 'a',
+        files: '*.js',
+      },
+    ],
+    semi: false,
+  },
+}).prettier
+assert.deepStrictEqual(
+  Object.keys(sortedPrettierConfig),
+  ['a', 'semi', 'trailingComma', 'z', 'overrides'],
+  'prettier field should sorted',
+)
+assert.deepStrictEqual(
+  Object.keys(sortedPrettierConfig.overrides[0]),
+  ['a', 'files', 'options', 'z'],
+  'prettier.overrides should sorted',
+)
+assert.deepStrictEqual(
+  Object.keys(sortedPrettierConfig.overrides[0].options),
+  ['a', 'semi', 'trailingComma', 'z'],
+  'prettier.overrides[].options should sorted',
+)
+
 testField('binary', [
   {
     value: {