Understanding `export =`

README.md

This is based on the export = and import = require() section in the modules page of the TypeScript handbook.

> const exportEquals = require('./exportEquals');
undefined
> exportEquals(2)
20
> exportEquals.MARKER
'HELLO'

exportEquals.js

"use strict";
function doMath(value) {
    return value + 18;
}
doMath.MARKER = 'HELLO'; // Would rather do `export.MARKER = 'HELLO'`.
module.exports = doMath;

exportEquals.ts

function doMath(value: number): number {
    return value + 18
}
export = doMath
doMath.MARKER = 'HELLO' // Would rather do `export.MARKER = 'HELLO'`.