File is not defined : when create File Object with typescript

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I write a program with typescript in node js (not an API or web app) just a console app. I have configured the typescript configuration. but when I make a File Object it give me error

UnhandledPromiseRejectionWarning: ReferenceError: File is not defined

My Code
// .......
var file = new File(["asdasdsa"], 'metadata.json');
console.log(file.name);
// ......

ts config json content

    {
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",
    "declaration": true,
    "strict": true,
    "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
    "strictNullChecks": true /* Enable strict null checks. */,
    "strictFunctionTypes": true /* Enable strict checking of function types. */,
    "noUnusedLocals": true /* Report errors on unused locals. */,
    "noUnusedParameters": true /* Report errors on unused parameters. */,
    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
    "importHelpers": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "sourceMap": true,
    "outDir": "./dist/tsc/",
    "types": [
      "node",
      "jest"
    ],
    "lib": [
      "ES6",
      "DOM"
    ]
  },
  "include": [
    "src/**/*.ts"
  ],
  "exclude": [
    "node_modules",
    "**/*.test.ts"
  ]
}

Anything I missed on typescript configuration. I want to make an object of File from typescript

tsconfig typescript node.js file
1 Answers

In nodejs, you don't have File type, but you can also use fs to create one

Something like this:

var fs = require('fs');

fs.writeFile('metadata.json', 'asdasdsa', function (err) {
  if (err) throw err;
});

This will create a file in your root folder.

And you can read it and send like so:

fs.readFile("./metadata.json", (err, data) => {
  if (err) res.status(500).send(err);
  res
    .contentType("application/pdf")
    .send(
      `data:application/pdf;base64,${new Buffer.from(data).toString("base64")}`
    );
});
user_51226150
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