cli/npm-install/postinstall.js

import triples from "@napi-rs/triples";
import { createWriteStream } from "fs";
import * as fs from "fs/promises";
import fetch from "node-fetch";
import { pipeline } from "stream/promises";
import tar from "tar";

import { CONFIG } from "./config.js";

async function install() {
	const packageJson = await fs.readFile("package.json").then(JSON.parse);
	let version = packageJson.version;

	if (typeof version !== "string") {
		throw new Error("Missing version in package.json");
	}

	if (version[0] === "v") version = version.slice(1);

	// Fetch Static Config
	let { name: binName, path: binPath, url } = CONFIG;
	let triple = triples.platformArchTriples[process.platform][process.arch][0];

	url = url.replace(/{{triple}}/g, triple.raw);
	url = url.replace(/{{version}}/g, version);
	url = url.replace(/{{bin_name}}/g, binName);
	console.log(url);
	const response = await fetch(url);
	if (!response.ok) {
		throw new Error("Failed fetching the binary: " + response.statusText);
	}

	const tarFile = "downloaded.tar.gz";

	await fs.mkdir(binPath, { recursive: true });
	await pipeline(response.body, createWriteStream(tarFile));
	await tar.x({ file: tarFile, cwd: binPath });
	await fs.rm(tarFile);
}

install()
	.then(async () => {
		process.exit(0);
	})
	.catch(async (err) => {
		console.error(err);
		process.exit(1);
	});