Sample
esbuild 0.25.12: Run esbuild on Alpine, where the usual advice is to install a musl-specific build
Verified sample for npm esbuild 0.25.12: Run esbuild on Alpine, where the usual advice is to install a musl-specific build. The contract ran on node 22 …
sha256:a0f58db3d8de78c03e494ff716388a0e06984c3dff37049d5dc94bcf7bcfe720
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 3
- Signing keys that built it
- 3
Declared environment
node 22 linux · musl x64 node 22 javascript npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · npm@1 |
2026-08-14 |
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · npm@1 |
2026-08-17 |
| node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · npm@1node:22-alpine@sha256:c610fcdfb1d5… |
2026-09-08 |
Case
HOW- Goal
- Run esbuild on Alpine, where the usual advice is to install a musl-specific build
- Packages
- Symbols
-
- esbuild.transform
- @esbuild/linux-x64
- Environment
- node 22
- Created
- 2026-08-14T06:31:51Z
Contract
- transform TypeScript with esbuild on a musl image, with lifecycle scripts disabled
- assert esbuild ships no musl-specific optional dependency to install
- assert the chosen platform package declares no libc constraint
- assert the binary has no ELF interpreter, read from its program headers
- assert node on the same image is dynamically linked against musl, so the check is real
Files
- csx.json
- package-lock.json
- package.json
- src/bundler.mjs
- test/contract.mjs
Source
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"lockfileVersion": 3,
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"packages": {
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"version": "1.0.0",
"dependencies": {
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}
},
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"cpu": [
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],
"license": "MIT",
"optional": true,
"os": [
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],
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}
},
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"cpu": [
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],
"license": "MIT",
"optional": true,
"os": [
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}
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}
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},
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},
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}
},
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"license": "MIT",
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"os": [
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"engines": {
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},
"node_modules/@esbuild/win32-arm64": {
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}
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"@esbuild/linux-ppc64": "0.25.12",
"@esbuild/linux-riscv64": "0.25.12",
"@esbuild/linux-s390x": "0.25.12",
"@esbuild/linux-x64": "0.25.12",
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"@esbuild/netbsd-x64": "0.25.12",
"@esbuild/openbsd-arm64": "0.25.12",
"@esbuild/openbsd-x64": "0.25.12",
"@esbuild/openharmony-arm64": "0.25.12",
"@esbuild/sunos-x64": "0.25.12",
"@esbuild/win32-arm64": "0.25.12",
"@esbuild/win32-ia32": "0.25.12",
"@esbuild/win32-x64": "0.25.12"
}
}
}
}
{
"name": "csx-esbuild-alpine",
"version": "1.0.0",
"private": true,
"type": "module",
"dependencies": {
"esbuild": "0.25.12"
}
}
import { createRequire } from "node:module";
import { openSync, readSync, closeSync } from "node:fs";
const require = createRequire(import.meta.url);
/**
* "Does esbuild work on Alpine?" — the folklore says you need a musl build,
* and the measurement says there isn't one and you don't.
*
* esbuild ships one optional dependency per platform (@esbuild/linux-x64
* and friends) and npm picks the matching one from its `os` and `cpu`
* fields. None of them declares `libc`, and none of them is a musl variant,
* because the binary is a statically linked Go executable: there is nothing
* for it to link against, so glibc and musl are the same environment to it.
*
* The package does declare a postinstall script, which is what makes people
* add --ignore-scripts to the list of suspects. It is a fallback, not the
* mechanism. This sample is verified with lifecycle scripts disabled, so
* the receipt is the proof.
*/
export async function transformTypeScript(source) {
const esbuild = await import("esbuild");
const { code } = await esbuild.transform(source, { loader: "ts" });
return code;
}
export function platformPackage() {
const esbuildPkg = require("esbuild/package.json");
const names = Object.keys(esbuildPkg.optionalDependencies ?? {});
return {
optionalDependencies: names,
declaresPostinstall: Boolean(esbuildPkg.scripts?.postinstall),
installed: require("@esbuild/linux-x64/package.json"),
};
}
/**
* Reads the ELF program headers and returns the interpreter path, or null
* when there is no PT_INTERP segment — which is what "statically linked"
* means in the only way that can be checked rather than assumed.
*/
export function elfInterpreter(binaryPath) {
const fd = openSync(binaryPath, "r");
try {
const header = Buffer.alloc(64);
readSync(fd, header, 0, 64, 0);
if (header.toString("latin1", 0, 4) !== "\x7fELF") {
throw new Error("not an ELF file");
}
if (header[4] !== 2) throw new Error("expected a 64-bit ELF");
const phoff = Number(header.readBigUInt64LE(0x20));
const phentsize = header.readUInt16LE(0x36);
const phnum = header.readUInt16LE(0x38);
const entry = Buffer.alloc(phentsize);
for (let i = 0; i < phnum; i++) {
readSync(fd, entry, 0, phentsize, phoff + i * phentsize);
const PT_INTERP = 3;
if (entry.readUInt32LE(0) !== PT_INTERP) continue;
const offset = Number(entry.readBigUInt64LE(0x08));
const size = Number(entry.readBigUInt64LE(0x20));
const interp = Buffer.alloc(size);
readSync(fd, interp, 0, size, offset);
return interp.toString("latin1").replace(/\0+$/, "");
}
return null;
} finally {
closeSync(fd);
}
}
import assert from "node:assert/strict";
import { createRequire } from "node:module";
import {
elfInterpreter,
platformPackage,
transformTypeScript,
} from "../src/bundler.mjs";
const require = createRequire(import.meta.url);
// The question itself: esbuild runs, on musl, with lifecycle scripts off.
const code = await transformTypeScript("const x: number = 1; export default x");
assert.equal(code.trim(), "const x = 1;\nexport default x;");
const { optionalDependencies, declaresPostinstall, installed } = platformPackage();
// There is no musl build to go looking for. Every linux entry is a plain
// architecture, so the advice to install a "-musl" variant has nothing to
// install.
assert.ok(optionalDependencies.length > 0);
assert.equal(
optionalDependencies.filter((name) => name.includes("musl")).length,
0,
);
assert.ok(optionalDependencies.includes("@esbuild/linux-x64"));
// And the package npm chose does not constrain libc, which is why npm
// installs it on Alpine in the first place.
assert.deepEqual(installed.os, ["linux"]);
assert.deepEqual(installed.cpu, ["x64"]);
assert.equal(installed.libc, undefined);
// The postinstall script exists — it just is not how the binary arrives.
// This contract ran with --ignore-scripts, so the transform above already
// proved that; asserting the script is present keeps the two facts from
// being confused for each other later.
assert.equal(declaresPostinstall, true);
// Why any of this works: the binary has no ELF interpreter, so there is no
// dynamic loader to disagree about. Checked by reading the program headers
// rather than by trusting the claim.
const binary = require.resolve("@esbuild/linux-x64/bin/esbuild");
assert.equal(elfInterpreter(binary), null);
// The check is real: node itself is dynamically linked, and on this image
// the interpreter it names is musl's.
const nodeInterp = elfInterpreter(process.execPath);
assert.ok(nodeInterp && nodeInterp.includes("musl"), `node interpreter: ${nodeInterp}`);
console.log("contract ok");