diff --git a/README.md b/README.md
index c64072c..32c5676 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ Keys in `engines` are ordered alphabetically.
 
 ### Files
 
-Keys in `files` are ordered alphabetically, followed by `README.md` and `LICENSE` if they exist in the array.
+Keys in `files` are ordered alphabetically (keeping the negations below), followed by `README.md` and `LICENSE` if they exist in the array.
 
 ### Scripts
 
@@ -99,9 +99,14 @@ Top-level keys are sorted according to a style commonly seen in the packages of
   'bundledDependencies',
   'optionalDependencies',
   'peerDependencies',
+  'peerDependenciesMeta',
   'dependencies',
   'devDependencies',
-  'resolutions'
+  'resolutions',
+
+  // types
+  'types',
+  'typings'
 ]
 ```
 
diff --git a/lib/rules/files.js b/lib/rules/files.js
index 20eedbe..76e0264 100644
--- a/lib/rules/files.js
+++ b/lib/rules/files.js
@@ -35,7 +35,12 @@ const process = (props) => {
 
         return true;
       })
-      .sort((a, b) => (a.value > b.value ? 1 : a.value < b.value ? -1 : 0));
+      .sort((a, b) => {
+        const aValue = a.value.startsWith('!') ? a.value.substring(1) : a.value;
+        const bValue = b.value.startsWith('!') ? b.value.substring(1) : b.value;
+
+        return aValue.localeCompare(bValue);
+      });
 
     if (readme) {
       elements.push(readme);
diff --git a/lib/rules/sort.js b/lib/rules/sort.js
index 7caf6fe..03c32cc 100644
--- a/lib/rules/sort.js
+++ b/lib/rules/sort.js
@@ -47,6 +47,7 @@ const primary = [
   'bundledDependencies',
   'optionalDependencies',
   'peerDependencies',
+  'peerDependenciesMeta',
   'dependencies',
   'devDependencies',
   'resolutions'
diff --git a/package.json b/package.json
index 7ba5145..cf27b0a 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "author": "Max Milton <max@wearegenki.com>",
   "main": "lib/index.js",
   "engines": {
-    "node": ">= 8.0.0"
+    "node": ">=10.13.0"
   },
   "scripts": {
     "lint": "eslint lib test",
@@ -28,18 +28,26 @@
     "prettier": "^2.0.0"
   },
   "devDependencies": {
-    "ava": "3.9.0",
-    "eslint-config-shellscape": "2.1.0",
-    "eslint-plugin-prettier": "3.1.4",
-    "execa": "4.0.2",
-    "nyc": "15.1.0",
-    "prettier": "2.0.5"
+    "@commitlint/cli": "^11.0.0",
+    "@commitlint/config-conventional": "^11.0.0",
+    "ava": "^3.13.0",
+    "eslint-config-shellscape": "^2.1.0",
+    "execa": "^4.0.3",
+    "lint-staged": "^10.4.0",
+    "nyc": "^15.1.0",
+    "pre-commit": "^1.2.2",
+    "prettier": "^2.1.2"
   },
   "ava": {
     "files": [
       "!**/fixtures/**"
     ]
   },
+  "lint-staged": {
+    "*.js": [
+      "eslint --fix"
+    ]
+  },
   "nyc": {
     "include": [
       "lib/*.js"
diff --git a/test/files.js b/test/files.js
index e6649ae..678f2d9 100644
--- a/test/files.js
+++ b/test/files.js
@@ -16,3 +16,33 @@ test('default', (t) => {
 
   t.snapshot(output);
 });
+
+test('negations', (t) => {
+  const options = {
+    filepath: 'package.json',
+    parser: 'json-stringify',
+    plugins: ['.']
+  };
+  const fixture = {
+    files: [
+      '/lit-html.js',
+      '/lit-html.js.map',
+      '/lit-html.d.ts',
+      '/lit-html.d.ts.map',
+      '/directives/',
+      '/parts.js',
+      '/parts.js.map',
+      '/parts.d.ts',
+      '/parts.d.ts.map',
+      '/src/',
+      '!/src/test/',
+      '/development/',
+      '!/development/test/'
+    ]
+  };
+
+  const input = JSON.stringify(fixture, null, 2);
+  const output = prettier.format(input, options);
+
+  t.snapshot(output);
+});
diff --git a/test/snapshots/files.js.md b/test/snapshots/files.js.md
index 747e38d..c312ae0 100644
--- a/test/snapshots/files.js.md
+++ b/test/snapshots/files.js.md
@@ -16,3 +16,26 @@ Generated by [AVA](https://ava.li).
       ]␊
     }␊
     `
+
+## negations
+
+> Snapshot 1
+
+    `{␊
+      "files": [␊
+        "/development/",␊
+        "!/development/test/",␊
+        "/directives/",␊
+        "/lit-html.d.ts",␊
+        "/lit-html.d.ts.map",␊
+        "/lit-html.js",␊
+        "/lit-html.js.map",␊
+        "/parts.d.ts",␊
+        "/parts.d.ts.map",␊
+        "/parts.js",␊
+        "/parts.js.map",␊
+        "/src/",␊
+        "!/src/test/"␊
+      ]␊
+    }␊
+    `
diff --git a/test/snapshots/files.js.snap b/test/snapshots/files.js.snap
index 776ef7c..46c8059 100644
Binary files a/test/snapshots/files.js.snap and b/test/snapshots/files.js.snap differ