build.mjs

import { build } from "esbuild";
import alias from "esbuild-plugin-alias";
import swc from "@swc/core";
import { promisify } from "util";
import { exec as _exec } from "child_process";
import fs from "fs/promises";
import path from "path";
const exec = promisify(_exec);

const tsconfig = JSON.parse(await fs.readFile("./tsconfig.json"));
const aliases = Object.fromEntries(Object.entries(tsconfig.compilerOptions.paths).map(([alias, [target]]) => [alias, path.resolve(target)]));
const commit = (await exec("git rev-parse HEAD")).stdout.trim().substring(0, 7) || "custom";

try {
    await build({
        entryPoints: ["./src/entry.ts"],
        outfile: "./dist/vendetta.js",
        minify: true,
        bundle: true,
        format: "iife",
        target: "esnext",
        plugins: [
            {
                name: "swc",
                setup: (build) => {
                    build.onLoad({ filter: /\.[jt]sx?/ }, async (args) => {
                        // This actually works for dependencies as well!!
                        const result = await swc.transformFile(args.path, {
                            jsc: {
                                externalHelpers: true,
                            },
                            env: {
                                targets: "defaults",
                                include: [
                                    "transform-classes",
                                    "transform-arrow-functions",
                                ],
                            },
                        });
                        return { contents: result.code };
                    });
                },
            },
            alias(aliases),
        ],
        define: {
            __vendettaVersion: `"${commit}"`,
        },
        footer: {
            js: "//# sourceURL=Vendetta",
        },
        legalComments: "none",
    });

    console.log("Build successful!");
} catch (e) {
    console.error("Build failed...", e);
    process.exit(1);
}