Read and write a text file in typescript

Question

How should I read and write a text file from typescript in node.js? I am not sure would read/write a file be sandboxed in node.js, if not, i believe there should be a way in accessing file system.

Answer 1

believe there should be a way in accessing file system.

Include node.d.ts using npm i @types/node. And then create a new tsconfig.json file (npx tsc --init) and create a .ts file as followed:

import * as fs from 'fs';
fs.readFileSync('foo.txt','utf8');

You can use other functions in fs as well : https://nodejs.org/api/fs.html

More

Node quick start : https://basarat.gitbook.io/typescript/nodejs

Answer 2

import { readFileSync } from 'fs';

const file = readFileSync('./filename.txt', 'utf-8');

This worked for me. You may need to wrap the second command in any function or you may need to declare inside a class without keyword const.

Answer 3

First you will need to install node definitions for Typescript. You can find the definitions file here:

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/node/node.d.ts

Once you've got file, just add the reference to your .ts file like this:

/// <reference path="path/to/node.d.ts" />

Then you can code your typescript class that read/writes, using the Node File System module. Your typescript class myClass.ts can look like this:

/// <reference path="path/to/node.d.ts" />

class MyClass {

    // Here we import the File System module of node
    private fs = require('fs');

    constructor() { }

    createFile() {

        this.fs.writeFile('file.txt', 'I am cool!',  function(err) {
            if (err) {
                return console.error(err);
            }
            console.log("File created!");
        });
    }

    showFile() {

        this.fs.readFile('file.txt', function (err, data) {
            if (err) {
                return console.error(err);
            }
            console.log("Asynchronous read: " + data.toString());
        });
    }
}

// Usage
// var obj = new MyClass();
// obj.createFile();
// obj.showFile();

Once you transpile your .ts file to a javascript (check out here if you don't know how to do it), you can run your javascript file with node and let the magic work:

> node myClass.js

Answer 4

import * as fs from 'fs';
import * as path from 'path';

fs.readFile(path.join(__dirname, "filename.txt"), (err, data) => {
    if (err) throw err;
    console.log(data);
})

EDIT:

consider the project structure:

../readfile/
├── filename.txt
└── src
    ├── index.js
    └── index.ts

consider the index.ts:

import * as fs from 'fs';
import * as path from 'path';

function lookFilesInDirectory(path_directory) {
    fs.stat(path_directory, (err, stat) => {
        if (!err) {
            if (stat.isDirectory()) {
                console.log(path_directory)
                fs.readdirSync(path_directory).forEach(file => {
                    console.log(`\t${file}`);
                });
                console.log();
            }
        }
    });
}

let path_view = './';
lookFilesInDirectory(path_view);
lookFilesInDirectory(path.join(__dirname, path_view));

if you have in the readfile folder and run tsc src/index.ts && node src/index.js, the output will be:

./
        filename.txt
        src

/home/andrei/scripts/readfile/src/
        index.js
        index.ts

that is, it depends on where you run the node.

the __dirname is directory name of the current module.

Answer 5

I encounter "Cannot find module 'fs' or its corresponding type declarations" when

import { readFileSync } from 'fs';

How I solve it

A bit deviation from Jerome Villiseck's ans

Edit tsconfig.app.json:

...
"include": [
    "src/**/*.d.ts",
    "node_modules/@types/node/"
]
...

Answer 6

Just to clarify: if ever the TS 2307: Cannot find module import error appears: check the tsconfig.json file.

It must contain node_modules

{
.....
  "include": [
    "src/**/*.ts",
    "src/**/*.tsx",
    "src/**/*.vue",
    "tests/**/*.ts",
    "tests/**/*.tsx",
    "node_modules"
  ],
.....
}

Answer 7

It is possible to write file in ts. But something how its js. You can install jquery to run javascript in angular.

npm i jquery

Import in it in angular.json file and use this code

var fileWriter = new Writer();
var fileName = "test_syskey/Test.doc";
fileWriter.removeFile(fileName, function(err,url) {
    if (err) {
        resp.error("Write failed");
    } else {
        resp.success(url);
    }
}); 

Answer 8

I was receiving the Cannot find module 'fs' or its corresponding type declarations error, even with @types/node installed. Here is the full solution that worked for me:

In terminal:

npm install --save-dev @types/node

In the script (src/fileReader.ts):

/// <reference path="../node_modules/@types/node/fs.d.ts" />
import fs from "fs";

let data = fs.readFileSync("myfile.txt")

Version list:

npm version: 9.3.1

node version: 19.5.0

@types/node version: 18.15.0

tsc version: 4.7.4