π¦ Trim npm package size (521 KB β 213 KB, no runtime change)#1206
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Shrinks the published `effection` npm package without touching the code consumers actually run. Three dnt build options in tasks/build-npm.ts: - `sourceMap: false` β stop shipping `.js.map` (no runtime value) - `declaration: "separate"` β emit `.d.ts` once into a shared `types/` folder instead of duplicating across `esm/` and `script/` - `skipSourceOutput: true` β stop shipping raw `src/*.ts` Measured (npm pack): - unpacked on disk: 521 KB -> 213 KB (-59%), 427 -> 145 files - download (.tgz): 80 KB -> 40 KB (-49%) - runtime bundle (min+gzip): 5.8 KB, unchanged The 5.8 KB a bundler pulls into an app was already optimal; the old 580 KB was install-only dev artifacts (sourcemaps, per-module dup'd declarations, raw TS source) that no app bundle loads. Verified ESM import, CJS require, and `tsc` type resolution all still pass. Works on the currently pinned dnt 0.41.3 β no toolchain bump required.
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cowboyd
approved these changes
Jul 5, 2026
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Motivation
pkg-size.dev/effectionreports the published package at ~580 KB, which looks alarming. On inspection almost all of it is install-only dev artifacts, not code that lands in a consumer's app bundle β the runtime cost a bundler actually pulls in was already optimal at ~5.8 KB min+gzip. The tarball was ~30% sourcemaps, ~20% duplicated.d.ts(emitted into bothesm/andscript/), and ~18% raw TS source β none of which a bundler loads. This PR trims that fat without touching the code consumers run.Approach
Three dnt build options in
tasks/build-npm.ts:sourceMap: false.js.map(no runtime value)declaration: "separate".d.tsonce into a sharedtypes/folder instead of duplicating acrossesm/andscript/skipSourceOutput: truesrc/*.tsWorks on the currently pinned dnt 0.41.3 β no toolchain bump required.
Measured (via
npm pack).tgzgzip)Verified
import { run, sleep } from "effection"runsrequire("effection")runs (CJS output preserved)tsc --noEmitresolves types against the new sharedtypes/folderNotes / decisions
deno bundle --declaration(the "bundled single.d.ts" idea) was evaluated and rejected: it can't type-check effection's cross-runtimelib/main.ts(usesDeno.*, DOM, and anode:processdynamic import at once β no singlelibsatisfies all three), and pre-bundling gave no runtime-size win since bundlers already tree-shake the modular output.sourceMap: falseis the one debatable line β it drops the biggest chunk (157 KB) but also removes published debugging maps. If shipping sourcemaps is preferred, revert just that line (unpacked lands at ~370 KB instead of 213 KB).