Extending npm's built-in init behavior rather than replacing it

.npm-init.js

// $HOME/.npm-init.js
function main() {
    // Put your customizations here
    package.private = true;
}

// Helpers for getting access to modules that are either installed globally or available as dependencies of npm
function requireGlobal(name) {
    return require(require('path').join(config.get('prefix'), 'node_modules', name));
}
function requireNpmDep(name) {
    return requireGlobal(`npm/node_modules/${ name }`);
}

// Everything below this point is a hack to pull in npm's default `npm init` prompts
const fs = require('fs');
const Path = require('path');
const npmDepsPath = Path.join(config.get('prefix'), 'node_modules/npm/node_modules');
const defaultInitPath = Path.join(npmDepsPath, 'init-package-json/default-input.js');
const body = fs.readFileSync(defaultInitPath, 'utf8');
const exp = {};
exports = module.exports = ({require, exports, module}) => (
    eval(body)
)({
    require(path) {
        try {return require(path)} catch(e) {return require(Path.join(npmDepsPath, path))}
    },
    exports: exp,
    module: {exports: exp}
});
main();