feat(validation): init package

packages/nestjs-validation/package.json

@@ -0,0 +1,47 @@
+{
+  "name": "@atls/nestjs-validation",
+  "version": "0.0.0",
+  "license": "BSD-3-Clause",
+  "type": "module",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": "./src/index.ts"
+  },
+  "main": "src/index.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "yarn library build",
+    "prepack": "yarn run build",
+    "postpack": "rm -rf dist"
+  },
+  "devDependencies": {
+    "@nestjs/common": "^10.0.5",
+    "@nestjs/core": "^10.0.5",
+    "class-transformer": "0.5.1",
+    "class-validator": "^0.14.0",
+    "reflect-metadata": "^0.1.13",
+    "rxjs": "^7.8.1"
+  },
+  "peerDependencies": {
+    "@nestjs/common": "^10",
+    "@nestjs/core": "^10",
+    "class-transformer": "0.5",
+    "class-validator": "^0.14",
+    "reflect-metadata": "^0.1",
+    "rxjs": "^7"
+  },
+  "publishConfig": {
+    "exports": {
+      "./package.json": "./package.json",
+      ".": {
+        "import": "./dist/index.js",
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      }
+    },
+    "main": "dist/index.js",
+    "typings": "dist/index.d.ts"
+  }
+}

packages/nestjs-validation/src/errors/index.ts

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+export * from './validation.error.js'

packages/nestjs-validation/src/errors/validation.error.ts

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+import type { ValidationError as VError } from 'class-validator'
+
+export class ValidationError extends Error {
+  constructor(public readonly errors: Array<VError>) {
+    super()
+
+    this.message = 'Validation failed'
+  }
+}

packages/nestjs-validation/src/index.ts

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+export * from './validator/index.js'
+export * from './module/index.js'
+export * from './errors/index.js'

packages/nestjs-validation/src/module/index.ts

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+export * from './validation.module.js'

packages/nestjs-validation/src/module/validation.module.ts

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+import type { DynamicModule } from '@nestjs/common'
+
+import { Module }             from '@nestjs/common'
+
+import { Validator }          from '../validator/index.js'
+
+@Module({})
+export class ValidationModule {
+  static register(): DynamicModule {
+    return {
+      module: ValidationModule,
+      providers: [
+        {
+          provide: Validator,
+          useClass: Validator,
+        },
+      ],
+      exports: [
+        {
+          provide: Validator,
+          useClass: Validator,
+        },
+      ],
+    }
+  }
+}

packages/nestjs-validation/src/validator/index.ts

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+export * from './validator.js'

packages/nestjs-validation/src/validator/validator.ts

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+import type { ClassConstructor } from 'class-transformer'
+
+import { plainToInstance }       from 'class-transformer'
+import { validate }              from 'class-validator'
+
+import { ValidationError }       from '../errors/index.js'
+
+export class Validator {
+  async transform<T>(metatype: ClassConstructor<unknown>, value: object): Promise<T> {
+    return plainToInstance(metatype, value) as T
+  }
+
+  async validate<T>(valueOrObject: object, metatype?: ClassConstructor<unknown>): Promise<T> {
+    const transformed = metatype ? await this.transform<T>(metatype, valueOrObject) : valueOrObject
+
+    const errors = await validate(transformed as object)
+
+    if (errors.length > 0) {
+      throw new ValidationError(errors)
+    }
+
+    return transformed as T
+  }
+}