initial impl

.gitignore

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+node_modules
+/dist
+

build.js

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+import { writeFile } from "fs/promises";
+import { createContext } from "./src/index.ts";
+import tsc from "tsc-prog";
+
+const isDev = process.argv.includes("--dev");
+
+const buildContext = createContext({
+  bundle: true,
+});
+
+const common = {
+  external: ["tiny-glob", "defu", "esbuild"],
+  entryPoints: ["./src/index.js"],
+  platform: "node",
+  target: "node14",
+  format: "esm",
+};
+
+buildContext.config({
+  ...common,
+  outdir: "./dist/esm",
+  format: "esm",
+  outExtension: {
+    ".js": ".mjs",
+  },
+});
+
+buildContext.config({
+  ...common,
+  outdir: "./dist/cjs",
+  format: "cjs",
+  outExtension: {
+    ".js": ".js",
+  },
+});
+
+buildContext.on("error", (errors) => {
+  errors.map((x) => process.stdout.write(x.reason.toString() + "\n"));
+});
+
+buildContext.on("build", async () => {
+  process.stdout.write("[custom-builder] Built\n");
+  await writeFile(
+    "./dist/cjs/package.json",
+    JSON.stringify({ type: "commonjs" }),
+    "utf8"
+  );
+
+  await writeFile(
+    "./dist/esm/package.json",
+    JSON.stringify({ type: "module" }),
+    "utf8"
+  );
+
+  tsc.build({
+    basePath: process.cwd(),
+    compilerOptions: {
+      rootDir: "src",
+      outDir: "./dist/types",
+      declaration: true,
+      moduleResolution: "nodenext",
+      target: "esnext",
+      module: "NodeNext",
+      emitDeclarationOnly: true,
+      skipLibCheck: true,
+    },
+    include: ["src/**/*"],
+    exclude: ["**/*.test.ts", "**/*.spec.ts"],
+  });
+
+  if (isDev) return;
+
+  process.exit(0);
+});
+
+function createChain() {
+  let agg = Promise.resolve();
+  const _chainer = (fn) => {
+    agg = agg.then(fn);
+  };
+  _chainer.value = async () => {
+    await agg;
+    return null;
+  };
+  return _chainer;
+}
+
+const chain = createChain();
+
+if (isDev) {
+  chain(() => buildContext.watch());
+}
+
+chain(() => buildContext.build());
+
+await chain.value;

package.json

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+{
+  "name": "esbuild-multicontext",
+  "version": "0.0.0",
+  "license": "MIT",
+  "type": "module",
+  "main": "dist/cjs/index.js",
+  "module": "dist/esm/index.mjs",
+  "types": "./dist/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/types/index.d.ts",
+      "import": "./dist/esm/index.mjs",
+      "require": "./dist/cjs/index.js"
+    },
+    "./cjs": "./dist/esm/index.js",
+    "./esm": "./dist/esm/index.mjs",
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "build": "tsx build.js",
+    "dev": "tsx build.js --dev"
+  },
+  "dependencies": {
+    "defu": "^6.1.3",
+    "esbuild": "^0.19.8",
+    "tiny-glob": "^0.2.9"
+  },
+  "devDependencies": {
+    "@barelyhuman/prettier-config": "^1.1.0",
+    "@types/node": "^20.10.2",
+    "prettier": "^3.1.0",
+    "tsc-prog": "^2.3.0",
+    "tsx": "^4.6.1",
+    "typescript": "^5.3.2"
+  }
+}