@tanker/file-ponyfill v4.0.0
A cross-browser ponyfill for File
Why
A common issue with the JavaScript File
class is the lack of a constructor in some browsers:
new File(['Hi!'], 'file.txt'); // will throw in Edge and Internet Explorer
Using feature detection, this package will either expose a File
ponyfill in browsers lacking a proper constructor, or the native File
class in others.
Usage
You can safely use this package as a drop-in replacement for the native File
class in all browsers, e.g.:
import FilePonyfill from '@tanker/file-ponyfill';
// Get bits from whatever method you want, using fetch() as an example
const response = await fetch('https://your.server.com/path/to/a/report.pdf');
const bits = [await response.arrayBuffer()];
// Construct a file in a cross-browser fashion
const file = new FilePonyfill(bits, 'report.pdf', { type: 'application/pdf' });
// Check what we've got
file instanceof window.Blob; // true
file instanceof window.File; // true
file instanceof FilePonyfill; // true
file.name; // 'report.pdf'
file.type; // 'application/pdf'
file.size; // the size of report.pdf
Note that the ponyfill is built using a clever class hierarchy so that instances will appear as regular File
and Blob
instances, which can safely be read by a FileReader
and used with other APIs working with files.
License
Developped by Tanker, under the Apache-2.0 license.
Tanker allows seamless integration of end-to-end encryption in your application.
Read the documentation to get started.
Go to tanker.io for more informations about Tanker.
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