feat: make each plugin an npm workspace built by a termix-plugin CLI

packages/plugin-sdk/cli/commands/build.mjs

@@ -0,0 +1,69 @@
+import fs from "node:fs";
+import path from "node:path";
+import * as esbuild from "esbuild";
+import { BACKEND_EXTERNALS, FRONTEND_EXTERNALS } from "../lib/externals.mjs";
+import { legacyCoreImports } from "../lib/legacy-core-imports.mjs";
+import { readManifest, resolveEntry, copyDir } from "../lib/plugin-dir.mjs";
+
+const BACKEND_ENTRIES = [
+  "src/backend/index.ts",
+  "src/backend/index.mjs",
+  "src/backend/index.js",
+];
+const FRONTEND_ENTRIES = [
+  "src/frontend/index.tsx",
+  "src/frontend/index.ts",
+  "src/frontend/index.mjs",
+  "src/frontend/index.js",
+];
+
+export async function build({ cwd }) {
+  const manifest = readManifest(cwd);
+  const pluginId = manifest.id ?? path.basename(cwd);
+  const outDir = path.join(cwd, "dist");
+
+  fs.rmSync(outDir, { recursive: true, force: true });
+  fs.mkdirSync(outDir, { recursive: true });
+
+  const backendEntry = resolveEntry(cwd, BACKEND_ENTRIES);
+  if (!backendEntry) {
+    throw new Error(
+      `${pluginId}: no backend entry (looked for ${BACKEND_ENTRIES.join(", ")})`,
+    );
+  }
+
+  await esbuild.build({
+    entryPoints: [backendEntry],
+    outfile: path.join(outDir, "backend.js"),
+    bundle: true,
+    format: "esm",
+    platform: "node",
+    target: "node22",
+    sourcemap: true,
+    logLevel: "warning",
+    external: BACKEND_EXTERNALS,
+    plugins: [legacyCoreImports({ pluginId, platform: "node" })],
+  });
+
+  const frontendEntry = resolveEntry(cwd, FRONTEND_ENTRIES);
+  if (frontendEntry) {
+    await esbuild.build({
+      entryPoints: [frontendEntry],
+      outfile: path.join(outDir, "frontend.js"),
+      bundle: true,
+      format: "esm",
+      platform: "browser",
+      target: "es2022",
+      jsx: "automatic",
+      sourcemap: true,
+      logLevel: "warning",
+      external: FRONTEND_EXTERNALS,
+      plugins: [legacyCoreImports({ pluginId, platform: "browser" })],
+    });
+  }
+
+  copyDir(path.join(cwd, "locales"), path.join(outDir, "locales"));
+  copyDir(path.join(cwd, "migrations"), path.join(outDir, "migrations"));
+
+  console.log(`built ${pluginId}`);
+}