ts-x-file

Easily check the file size in any unit, change the file name or validate format of the file.

Updates from 1.0.14 version:

• The XFile instance could be initiated from Buffer and now could be used by Node application.

• In the isExtension() method now can be passed the Array<string> to validate extension with array of allowed values

• Fixed bug with build in Angular application

• More cases covered with new tests

Installation

$ npm install -s ts-x-file

Usage

Node example:

export class FileService {
    ...
 
    loadFile(): XFile {
        const buffer = fs.readFileSync('file.js');
        return new XFile(buffer);
    }
}

Angular example:

<input type="file" (change)="onFileChange($event)"/>

In your controller method:

onFileChange(event: any): void {
    const input = event.tartget as HTMLInputElement;
 
    // FileList initiation
    const xFile = new XFile(input.files);
    
    // Or you can pass File 
    const xFile = new XFile(input.files.item(0));
}

You can pass a parameter to constructor to change default unit:

import { XFile } from "ts-x-file";
 
onFileChange(event: any): void {
    const xFile = new XFile(event.target.files, FileSizeUnits.MB);
}

Then if you request a size of file it will be returned in this unit. By default, unit is KiloBytes.

Check if file size is not grater than:

isLessThan(limit: number, unit?: FileSizeUnits): boolean;

import { XFile, FileSizeUnits } from "ts-x-file";
 
const xFile = new XFile(event.target.files);
xFile.isLessThan(5000);

By default limit parameter is calculated as Bytes (if you did not change it through the constructor), you can change it by passing FileSizeUnit:

import { FileSizeUnits } from "ts-x-file";
 
const xFile = new XFile(event.target.files);
 
xFile.isLessThan(5, FileSizeUnits.B);
xFile.isLessThan(5, FileSizeUnits.KB);
xFile.isLessThan(5, FileSizeUnits.MB);
xFile.isLessThan(5, FileSizeUnits.GB);

This way it will ignore the default unit.

Get file size

size(round?: boolean = false, unit?: FileSizeUnits): number;

const fileSize = xFile.size();

By default this method won't round size number, you can do this by passing true on the first place parameter:

const fileSize = xFile.size(true);

The unit of returned value could be ignored, as well, if you pass it as second parameter:

import { FileSizeUnits } from "ts-x-file";
 
const fileSizeBytes     = xFile.size(true, FileSizeUnits.B);
const fileSizeKiloBytes = xFile.size(true, FileSizeUnits.KB);
const fileSizeMegaBytes = xFile.size(true, FileSizeUnits.MB);
const fileSizeGigaBytes = xFile.size(true, FileSizeUnits.GB);

Get or check extension

getExtension(): string;

const extension = xFile.getExtension();

you are able to check file extension by using method:

isExtension(extension: string | string[]): boolean;

const isPdf = xFile.isExtension('pdf');

of you can pass the array of allowed values:

const isPdf = xFile.isExtension(['jpg', 'JPEG']);

Note: the values are not case sensitive.

Get or change file name

Getting name of the file could be done by simply calling name getter:

console.log(xFile.name);

To set name property of file you can follow:

changeName(name: string, skipExt?: boolean): void;

const xFile = new XFile(event.target.files) // ex: react.js
console.log(xFile.name) // out: react.js
 
xFile.changeName('angular.js');
console.log(xFile.name) // out: angular.js

If you want to change extension of file, you just need to pass it as name parameter and set skipExt parameter to true:

xFile.changeName('angular.ts', true);
console.log(xFile.name) // out: angular.ts
 
// If you skip to set `skipExt` parameter you should get something like this:
xFile.changeName('angular.ts');
console.log(xFile.name) // out: angular.ts.js

Get the File instace or Base64

Somehow, on the end you will need an instance or Base64 string, so this is possible with following methods:

getFile(): File;
getBase64(): Promise<string>;

File instance example:

const file: File = xFile.getFile();

Base64 string example:

const urlString = xFile.getBase64().then(console.log) // data:image/png;base64,...

Check if File instance exists:

fileExists(): boolean;

This could be used to validate:

if (xFile.fileExists()) {
...
}

Testing

Run tests with following command:

$ jest

Todos

• Create collection of XFile instances to perform bulk actions
• Write MORE Tests

License

MIT

Feel free to contribute!