integration: Remove lodash dependency (#1388)

.changeset/afraid-planets-mix.md

@@ -0,0 +1,5 @@
+---
+'@vanilla-extract/integration': patch
+---
+
+Remove `lodash` dependency

packages/integration/package.json

@@ -22,14 +22,12 @@
     "eval": "0.1.8",
     "find-up": "^5.0.0",
     "javascript-stringify": "^2.0.1",
-    "lodash": "^4.17.21",
     "mlly": "^1.4.2",
     "outdent": "^0.8.0",
     "vite": "^5.0.11",
     "vite-node": "^1.2.0"
   },
   "devDependencies": {
-    "@types/babel__core": "^7.20.5",
-    "@types/lodash": "^4.14.168"
+    "@types/babel__core": "^7.20.5"
   }
 }

packages/integration/src/processVanillaFile.ts

@@ -2,7 +2,6 @@ import { FileScope, Adapter } from '@vanilla-extract/css';
 import { transformCss } from '@vanilla-extract/css/transformCss';
 import evalCode from 'eval';
 import { stringify } from 'javascript-stringify';
-import isPlainObject from 'lodash/isPlainObject';
 import outdent from 'outdent';
 
 import { hash } from './hash';
@@ -11,6 +10,24 @@ import type { IdentifierOption } from './types';
 
 const originalNodeEnv = process.env.NODE_ENV;
 
+function isPlainObject(value: unknown) {
+  if (typeof value !== 'object' || value === null) return false;
+
+  if (Object.prototype.toString.call(value) !== '[object Object]') return false;
+
+  const proto = Object.getPrototypeOf(value);
+  if (proto === null) return true;
+
+  const Ctor =
+    Object.prototype.hasOwnProperty.call(proto, 'constructor') &&
+    proto.constructor;
+  return (
+    typeof Ctor === 'function' &&
+    Ctor instanceof Ctor &&
+    Function.prototype.call(Ctor) === Function.prototype.call(value)
+  );
+}
+
 export function stringifyFileScope({
   packageName,
   filePath,