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日本の数値単位（万・億・兆・京・垓・…那由多・無量大数）に変換するユーティリティライブラリ
sugepanjp-number-unit は、日本語の数値単位（万・億・兆・京・垓・…那由多・無量大数）に変換する JavaScript ライブラリです。BigInt に対応し、高精度な変換が可能です。
import { formatNumberUnit } from './node_modules/jp-number-unit/index.js';
formatNumberUnit(1234567890000n); // "1234.5678兆"MIT