LilScript

Measured ports

Same work. Count the bytes.

These are libraries and apps we rewrote in LilScript to see what the compiler actually does. Numbers are Brotli-11 of the selected JavaScript, scored with the same stock zlib / official Brotli binaries. Typical complete ports sit around 5–10% smaller. The cards also show the larger cuts and the rows that have not moved, or have moved the wrong way.

Monaco · VS Code’s editor

monaco-editor 0.56, JavaScript versus LilScript.

The JS page is npm monaco-editor. The Lil page is compiled from ports/monaco/entry.lil plus 992 catalog modules. Workers except TypeScript are LilScript; both pages still load Microsoft ts.worker so diagnostics match. The view is a functioning editor — create, type, undo, find, fold, hover, suggest — not a claim that every VS Code workbench feature is present.

Open monacolil Port source
npm ide.js 887,420 B
Lil ide.js 413,607 B
JS + workers, no tsc 1,416,410 B
Lil + workers, no tsc 415,045 B

Frameworks and apps

Runnable products, with a scope line on each card.

SolidLil · keyed app

Solid 2.0 vs SolidLil

Official js-framework-benchmark keyed table. Solid 2.0 on the left, compiler-only SolidLil on the right.

Solid 2.011,180
SolidLil3,862
Brotli−65%
 Historical Solid 1.9

solid-js Core

Archived 1.9 open-world Core row. Current published port is Solid 2.0 on the SolidLil lab.

Solid Core8,551
SolidLil8,433
Brotli−1.4%
 Historical Solid 1.9

solid-js Store

Archived 1.9 Store surface. Not the current Solid 2.0 client row.

Solid Store4,286
SolidLil4,231
Brotli−1.3%
 Lilastro app

Lastro

Parcel Market versus the accessibility-matched Astro control.

Astro2,672
Lastro2,665
Brotli−0.3%
 motion@13 surface

Motion

mix / wrap / stagger / spring. Live carousel and spring fixtures in the Motion lab. Full DOM package is still backlog.

npm Vite4,044
LilScript2,333
Brotli−42%
 Historical LSX app

Solid todolist

Archived JSX vs LSX todolist. −32% Brotli. Not the current integrated lab gate.

Solid JSX5,479
SolidLil3,722
Brotli−32%

Complete and exact entrypoints

Published roots, same input domain.

Eligible rows beat npm/Vite and public-API Closure ADVANCED on the selected codec, and stay within 1.05× on the isolated runtime gate.

Exact root

gl-matrix

Complete ESM namespace and setMatrixArrayType.

npm Vite14,330
LilScript14,116
Brotli−1.5%
 Complete package

murmurhash-js

MurmurHash 2 and 3. Reusable API, not an app-specialized kernel.

npm Vite902
LilScript409
Brotli−55%
 Complete package

js-levenshtein

Full root. Eligible on size and throughput.

npm Vite825
LilScript404
Brotli−51%
 Complete package

clamp + lerp

Both published roots compiled together.

npm Vite519
LilScript112
Brotli−78%
 Complete package

@emotion/hash

Published root versus Vite and Closure ADVANCED.

npm Vite330
LilScript231
Brotli−30%
 Complete package

robust-predicates

Large typed suite. The cut is closer to the 5–10% band.

npm Vite6,456
LilScript5,972
Brotli−7.5%
 Exact browser entry

Nano ID

Published browser entrypoint. Effectively tied.

npm Vite409
LilScript408
Brotli−0.2%
 Exact root

mitt

Complete default-export surface. Currently a few Brotli bytes up.

npm Vite300
LilScript302
Brotli+0.7%
 Exact root

clsx

Recursive class-name builder. Size gate is open on Brotli.

npm Vite493
LilScript497
Brotli+0.8%

Selected surfaces

Not the whole package. Still a real rewrite.

These rows implement a declared subset. They are useful pressure tests. They are not “we replaced Preact.”

Candidate surface

immer

produce path used by the app contract.

npm Vite4,133
LilScript3,721
Brotli−10%
 Core subset

Preact 10

Selected render surface, not the full Preact package.

npm Vite5,988
LilScript2,789
Brotli−53%
 Store subset

Redux Toolkit

Store core used by the contract. Not the full toolkit.

npm Vite6,212
LilScript3,442
Brotli−45%
 Parse subset

Zod 3

Schema parse surface in the app. Not complete Zod.

npm Vite12,518
LilScript4,138
Brotli−67%
 Parse subset

Acorn 8

Parser subset required by the contract app.

npm Vite29,529
LilScript4,407
Brotli−85%
 Complete easing package

@motionone/easing

Full published easing root. Smaller than Vite and Closure; the isolated throughput gate is still just over 1.05×.

npm Vite431
LilScript266
Brotli−38%

Published · not smaller

jQuery 3.7.1 is published. It is not smaller yet.

The public-library row is a pressure test: host-heavy, string keys, a plugin facade. Behavior lanes for core, deferred, data, events, selectors, ajax, and effects are in the repo. The current Brotli-oriented compiler output is larger than npm jquery.min.js. That is stated here so the other cards stay honest.

Full surface · not eligible

jQuery

Dual configs: stable $ for a script tag, full mangle for a LilScript-only app. Official min is still 1.13× smaller.

npm min27,445
LilScript30,973
Brotli+13%

Parse API

marked 18.0.10, scored without the extension system.

The parse API, GFM and CommonMark HTML, 660/660 against marked@18.0.10. This port has no use(). Official JavaScript is the parse-only 18.0.10 sources, then Oxc and Terser, mangling on and off. The published LilScript artifact is the compiler-selected ESM — not bundled, not post-minified, and still smaller on raw, gzip-9, and Brotli-11 than either minifier, while parsing the same corpus faster in Chromium.

Parse API only

marked

Fair size lane is parse-only official Oxc with mangling on, not the npm file that still includes Hooks and use(). Smaller on all three metrics, and the fastest lane measured.

Oxc mangle10,092
LilScript9,580
Brotli−5.1%

Open the pairs

Left is the original. Right is the compile.

These are the hosted comparisons. When this site is on GitHub Pages, they are the github.io URLs.

SolidLil

yeargun.github.io/solidlil

Solid 2.0 client lab and the official keyed table (11,180 B → 3,862 B).

Open SolidLil Motion

yeargun.github.io/motionlil

16 paired Motion fixtures.

Open Motionlil MobX

yeargun.github.io/mobxlil

MobX 7 public API, official tests, size vs Vite 8 Oxc.

Open MobXlil jQuery

yeargun.github.io/jquerylil

jQuery 3.7.1 drop-in. Official min is still 1.13× smaller on Brotli.

Open jQuerylil marked

yeargun.github.io/markedlil

marked 18.0.10 parse API. 9,580 B vs parse-only official Oxc 10,092 B, not the full use() package.

Open Markedlil Monaco

yeargun.github.io/monacolil

Submodule catalog and the paired editors.

Open Monacolil This site

In-repo demos

Lastro, hashes, algorithms, Closure pairs — Solid keyed, Motion carousel.

Browse demos

More tables. Filterable corpus: library lab, benchmarks, explorer. Delivery architecture: Lilpack. Language: syntax and behavior.