Task: build a compiler feedback app in JavaScript using nest.

API specification:

openapi: 3.0.3
info:
  title: CompilationNow
  description: CompilationNow is a simple webapp that returns compiler output for a given single-file code snippet in either TypeScript or C++
  version: 1.0.0
paths:
  /compile:
    post:
      summary: Attempt to compile file and returns whether compilation succeeds and if present, compiler errors.
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                fileName:
                  type: string
                  example: main.ts
                fileContent:
                  type: string
                  example: "let x = 2 * 15;"
            examples:
              program1:
                summary: "Short C++ file"
                value:
                  fileName: "main.cpp"
                  fileContent: "void main(){ return 0; }"
              program1:
                summary: "Short TypeScript file"
                value:
                  fileName: "background.ts"
                  fileContent: "let x = y * 2;"
      responses:
        "200":
          description: Whether compilation passed and compiler errors in case that the compilation failed
          content:
            application/json:
                schema:
                  type: object
                  properties:
                    hasError:
                      type: boolean
                      example: true
                    compilerError:
                      type: string | null
                      example: "background.ts:1:9 - error TS2304: Cannot find name 'y'."
 

Scenario instructions:

Environment instructions:

The NestJs was already created using the `nest new` command.

You need to populate the following files:
src/app.controller.spec.ts
src/app.controller.ts
src/app.module.ts
src/app.service.ts
src/main.ts


Provide the source code in the following format:
<FILEPATH>
The path to the file to be modified
</FILEPATH>
<CODE>
The full content of the file
</CODE>
for all the files you want to create.

Example:
<FILEPATH>
path/to/file.py
</FILEPATH>
<CODE>
def hello_world():
    pass
</CODE>



Make sure that the command `npm run start` starts the app successfully.


Allowed packages:

{
  "scripts": {
    "build": "nest build",
    "start": "nest start"
  },
  "engines": {
    "npm": ">=10.0.0",
    "node": ">=20.0.0"
  },
  "dependencies": {
    "@nestjs/common": "11.0.1",
    "@nestjs/core": "11.0.1",
    "@nestjs/platform-express": "11.0.1",
    "reflect-metadata": "0.2.2",
    "rxjs": "7.8.1",
    "bcrypt": "5.1.1",
    "dotenv": "16.4.7",
    "express": "4.21.2",
    "uuid": "11.0.3",
    "sqlite": "5.1.1",
    "sqlite3": "5.1.7",
    "multer": "1.4.5-lts.1",
    "cookie-parser": "1.4.7",
    "jsonwebtoken": "9.0.2"
  },
  "devDependencies": {
    "@nestjs/cli": "11.0.0",
    "@nestjs/schematics": "11.0.0",
    "@swc/cli": "0.6.0",
    "@swc/core": "1.10.8",
    "@types/express": "5.0.0",
    "@types/multer": "1.4.12",
    "@types/node": "22.10.7",
    "prettier": "3.4.2",
    "source-map-support": "0.5.21",
    "supertest": "7.0.0",
    "ts-loader": "9.5.2",
    "ts-node": "10.9.2",
    "typescript": "5.7.3"
  }
}