feat: Add _decorators module for exporting decorators

Author: tacxou

src/_decorators/index.ts

@@ -0,0 +1 @@
+export * from './real-ip.decorator'

src/_pipes/object-id-validation.pipe.ts

@@ -0,0 +1,12 @@
+import { ArgumentMetadata, BadRequestException, Injectable, PipeTransform } from '@nestjs/common'
+import { Types } from 'mongoose'
+
+@Injectable()
+export class ObjectIdValidationPipe implements PipeTransform<string, Types.ObjectId> {
+  public transform(value: string | Types.ObjectId, _metadata: ArgumentMetadata): Types.ObjectId {
+    if (!Types.ObjectId.isValid(value)) {
+      throw new BadRequestException(`Invalid ObjectId <${value}>`)
+    }
+    return new Types.ObjectId(value)
+  }
+}

src/index.ts

@@ -1,4 +1,5 @@
 export * from './_abstracts'
+export * from './_decorators'
 export * from './_filters'
 export * from './_pipes'
 export * from './auth'