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JavaScript bundle size: moment + lodash 138 KB vs dayjs + lodash-es 11 KB
How much smaller is a bundle with dayjs and a single lodash import than with moment and full lodash?
A tiny file that formats a date and chunks an array bundled to 138 KB (47 KB gzipped) with moment and full lodash, and 11 KB (4.9 KB gzipped) with dayjs and lodash-es/chunk, using esbuild --bundle --minify.
Results
| moment + lodash | 138 KB (47 KB gzip) |
|---|---|
| dayjs + lodash-es/chunk | 11 KB (4.9 KB gzip) |
How it was measured
esbuild --bundle --minify.
import chunk from 'lodash-es/chunk.js';Why
Importing one function allows tree-shaking; moment bundles locale data.
When this does not apply
Real apps differ; check with a bundle analyzer.
Environment
MacBook Air (Apple silicon, 8 cores), macOS. Measured 2026-10-12.
Source: shorts/demo-ticket/bundle in my content-engine repository. Treat any single run as a direction; re-run it on your hardware.
By Josué Barros, senior software engineer (full-stack, data and AI).