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js - package.json ts - tsconfig.json

determines import/export syntax

commonjs: import - require export - module.exports

const page = require('./page.js');

// page.js
module.exports.key = value;
module.exports.add = (a, b) => a + b;
module.exports.hi = "hello";

es modules: import/export statments;

tsc command:

.find - if we are sure there is a match with ! in typescript gives only the object