bun's bundle is about twice as large as esbuild's one

[m4r-v1n]

What version of Bun is running?

1.0.0

What platform is your computer?

Darwin 23.0.0 x86_64 i386

What steps can reproduce the bug?

// src.js

import { w3mConnectors, w3mProvider } from '@web3modal/ethereum'
import { Web3Modal } from '@web3modal/html'
import { configureChains, createConfig } from '@wagmi/core'
import { mainnet } from '@wagmi/core/chains'

const chains = [mainnet]
const projectId = '_PROJECT_ID_'

const { publicClient } = configureChains(chains, [w3mProvider({ projectId })])
const wagmiConfig = createConfig({
  autoConnect: true,
  connectors: w3mConnectors({ projectId, chains }),
  publicClient
})
const ethereumClient = new EthereumClient(wagmiConfig, chains)
const web3modal = new Web3Modal({ projectId }, ethereumClient)

$ esbuild src.js --bundle --minify --outfile=out.js

  out.js  822.6kb  👈

⚡ Done in 87ms

$ bun build src.js --minify --outfile=out.js

  out.js  1554.10 KB  👈

[107ms] bundle 722 modules

What is the expected behavior?

out.js should be about same size.

What do you see instead?

esbuild's out.js is 822.6 KB bun's out.js is 1554.10 KB

[fregante]

Could be unrelated, but I noticed that bun does not treeshake some functions. In my case (a plain bun build file.js), minify will preserve the bun-injected __require function that isn't used anywhere. I'm removing it with bun build file.js | sed 's/import.meta/{}/' 😅