The lodash method _.once exported as a Node.js module.
_.once
Using npm: bash $ {sudo -H} npm i -g npm $ npm i --save lodash.once
bash $ {sudo -H} npm i -g npm $ npm i --save lodash.once
In Node.js: js var once = require('lodash.once');
js var once = require('lodash.once');
See the documentation or package source for more details.