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Node.js - Hack
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  Add new extensions to require()

You can add new extensions to require() by extending require.extensions.

For a XML example:

// Add .xml for require()
require.extensions['.xml'] = (module, filename) => {
    const fs = require('fs')
    const xml2js = require('xml2js')

    module.exports = (callback) => {
        // Read required file.
        fs.readFile(filename, 'utf8', (err, data) => {
            if (err) {
                callback(err)
                return
            }
            // Parse it.
            xml2js.parseString(data, (err, result) => {
                callback(null, result)
            })
        })
    }
}

If the content of hello.xml is following:

<?xml version="1.0" encoding="UTF-8"?>
<foo>
    <bar>baz</bar>
    <qux />
</foo>

You can read and parse it through require():

require('./hello')((err, xml) {
    if (err)
        throw err;
    console.log(err);
})

It prints { foo: { bar: [ 'baz' ], qux: [ '' ] } }.

 

Read Article
https://develop.horje.com/learn/1434/reference

 

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