filesize of bun and its build artifact

[qinst64]

Bun v1.3.14 to v1.4.0 (now canary) , rust rewriting brings change of bun.exe filesize from 93.9MB to 76.2MB

Tested on windows, then zip/rar by winrar with default setting:

//hello-word.ts
console.log("hello world")

// build
bun build hello-word.ts --target=bun --outfile=hello-word.exe --production --compile

Result

file	v1.3.14	v1.4.0	Reduced
hello-world.exe	93.9MB	76.2MB	18.8%
hello-world.exe + zip	36.3MB	34.4MB	5.5%
hello-world.exe + rar	27.4MB	27.6MB	-0.7%

So, the compiled output filesize executable has big reduction (~18.8%), but not much after compression (~5.5% or -0.7%).

[qinst64]

After one week, bun.exe v1.4.0 cannary getting larger from 76.2MB to 79.6MB.

[qinst64]

Rewriting Bun in Rust

---
config:
  xyChart:
    showDataLabel: true
---
xychart-beta
    title "Bun 1.4.0 canary size"
    x-axis [2026.07.18, 2025.07.25, 2025.07.31]
    y-axis "Binary Size (MB)" 0 --> 95
    bar [76.3, 79.7, 80.4]

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