chore: import upstream snapshot with attribution

packages/plugin-cli/src/build/command.ts

@@ -0,0 +1,69 @@
+/**
+ * `emdash-plugin build`
+ *
+ * Thin citty wrapper around `buildPlugin` from `./api.js`. Produces the
+ * on-disk dist artifacts for an npm-installed sandboxed plugin:
+ *
+ *   - `dist/plugin.mjs` (+ `.d.mts`) — runtime bytes (hooks + routes).
+ *   - `dist/index.mjs` (+ `.d.mts`) — descriptor module, bare default export.
+ *   - `dist/manifest.json` — normalised manifest, kept in sync.
+ *
+ * Plugin authors run this from their package's `prepublishOnly` (or a
+ * `pnpm build` script that delegates). Bundling for the registry (the
+ * tarball form) is a separate command — see `emdash-plugin bundle`.
+ */
+
+import { defineCommand } from "citty";
+import consola from "consola";
+import pc from "picocolors";
+
+import { BuildError, buildPlugin, type BuildLogger } from "./api.js";
+
+export const buildCommand = defineCommand({
+	meta: {
+		name: "build",
+		description: "Build a sandboxed plugin's npm distribution artifacts",
+	},
+	args: {
+		dir: {
+			type: "string",
+			description: "Plugin directory (default: current directory)",
+			default: process.cwd(),
+		},
+		"out-dir": {
+			type: "string",
+			alias: "o",
+			description: "Output directory (default: ./dist)",
+			default: "dist",
+		},
+	},
+	async run({ args }) {
+		const logger: BuildLogger = {
+			start: (m) => consola.start(m),
+			info: (m) => consola.info(m),
+			success: (m) => consola.success(m),
+			warn: (m) => consola.warn(m),
+		};
+
+		let result;
+		try {
+			result = await buildPlugin({
+				dir: args.dir,
+				outDir: args["out-dir"],
+				logger,
+			});
+		} catch (error) {
+			if (error instanceof BuildError) {
+				consola.error(error.message);
+				process.exit(1);
+			}
+			throw error;
+		}
+
+		console.log();
+		consola.info("Output:");
+		console.log(`  ${pc.cyan(result.files.descriptor)}`);
+		console.log(`  ${pc.cyan(result.files.runtime)}`);
+		console.log(`  ${pc.cyan(result.files.manifestJson)}`);
+	},
+});