How to use the @ethersproject/units.commify function in @ethersproject/units

exports.SigningKey = signing_key_1.SigningKey;
var strings_1 = require("@ethersproject/strings");
exports.formatBytes32String = strings_1.formatBytes32String;
exports.nameprep = strings_1.nameprep;
exports.parseBytes32String = strings_1.parseBytes32String;
exports._toEscapedUtf8String = strings_1._toEscapedUtf8String;
exports.toUtf8Bytes = strings_1.toUtf8Bytes;
exports.toUtf8CodePoints = strings_1.toUtf8CodePoints;
exports.toUtf8String = strings_1.toUtf8String;
var transactions_1 = require("@ethersproject/transactions");
exports.computeAddress = transactions_1.computeAddress;
exports.parseTransaction = transactions_1.parse;
exports.recoverAddress = transactions_1.recoverAddress;
exports.serializeTransaction = transactions_1.serialize;
var units_1 = require("@ethersproject/units");
exports.commify = units_1.commify;
exports.formatEther = units_1.formatEther;
exports.parseEther = units_1.parseEther;
exports.formatUnits = units_1.formatUnits;
exports.parseUnits = units_1.parseUnits;
var wallet_1 = require("@ethersproject/wallet");
exports.verifyMessage = wallet_1.verifyMessage;
var web_1 = require("@ethersproject/web");
exports.fetchJson = web_1.fetchJson;
exports.poll = web_1.poll;
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// Enums
var sha2_2 = require("@ethersproject/sha2");
exports.SupportedAlgorithms = sha2_2.SupportedAlgorithms;
var strings_2 = require("@ethersproject/strings");
exports.UnicodeNormalizationForm = strings_2.UnicodeNormalizationForm;