feat: add util to function to get global object

Author: NoNameProvided

src/metadata/MetadataStorage.ts

@@ -2,6 +2,7 @@ import { ValidationMetadata } from './ValidationMetadata';
 import { ConstraintMetadata } from './ConstraintMetadata';
 import { ValidationSchema } from '../validation-schema/ValidationSchema';
 import { ValidationSchemaToMetadataTransformer } from '../validation-schema/ValidationSchemaToMetadataTransformer';
+import { getGlobal } from '../utils';
 
 /**
  * Storage all metadatas.
@@ -114,11 +115,11 @@ export class MetadataStorage {
  * Metadata storage follows the best practices and stores metadata in a global variable.
  */
 export function getMetadataStorage(): MetadataStorage {
-  if (typeof window !== 'undefined') {
-    window.global = window;
+  const global = getGlobal();
+
+  if (!global.classValidatorMetadataStorage) {
+    global.classValidatorMetadataStorage = new MetadataStorage();
   }
-  if (!(global as any).classValidatorMetadataStorage)
-    (global as any).classValidatorMetadataStorage = new MetadataStorage();
 
   return (global as any).classValidatorMetadataStorage;
 }

src/utils/convert-to-array.util.ts

@@ -0,0 +1,9 @@
+/**
+ * Convert Map, Set to Array
+ */
+export function convertToArray<T>(val: Array<T> | Set<T> | Map<any, T>): Array<T> {
+  if (val instanceof Map) {
+    return Array.from(val.values());
+  }
+  return Array.isArray(val) ? val : Array.from(val);
+}

src/utils/get-global.util.ts

@@ -0,0 +1,31 @@
+/**
+ * This function returns the global object across Node and browsers.
+ *
+ * Note: `globalThis` is the standardized approach however it has been added to
+ * Node.js in version 12. We need to include this snippet until Node 12 EOL.
+ */
+export function getGlobal() {
+  if (typeof globalThis !== 'undefined') {
+    return globalThis;
+  }
+
+  if (typeof global !== 'undefined') {
+    return global;
+  }
+
+  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+  // @ts-ignore: Cannot find name 'window'.
+  if (typeof window !== 'undefined') {
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore: Cannot find name 'window'.
+    return window;
+  }
+
+  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+  // @ts-ignore: Cannot find name 'self'.
+  if (typeof self !== 'undefined') {
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore: Cannot find name 'self'.
+    return self;
+  }
+}

src/utils/index.ts

@@ -0,0 +1,3 @@
+export * from './convert-to-array.util';
+export * from './get-global.util';
+export * from './is-promise.util'

src/utils.ts renamed to src/utils/is-promise.util.ts

@@ -4,12 +4,4 @@ export function isPromise<T = any>(p: any): p is Promise<T> {
   return p !== null && typeof p === 'object' && typeof p.then === 'function';
 }
 
-/**
- * Convert Map, Set to Array
- */
-export function convertToArray<T>(val: Array<T> | Set<T> | Map<any, T>): Array<T> {
-  if (val instanceof Map) {
-    return Array.from(val.values());
-  }
-  return Array.isArray(val) ? val : Array.from(val);
-}
+