feat: re-enable preview command

lib/commands/preview.ts

@@ -1,17 +1,90 @@
 import { ICommandParameter, ICommand } from "../common/definitions/commands";
-import { IErrors } from "../common/declarations";
+import { IChildProcess, IErrors } from "../common/declarations";
 import { injector } from "../common/yok";
+import { IOptions, IPackageManager } from "../declarations";
+import { IProjectData } from "../definitions/project";
+import path = require("path");
+import { resolvePackagePath } from "@rigor789/resolve-package-path";
+import { PackageManagers } from "../constants";
+
+const PREVIEW_CLI_PACKAGE = "@nativescript/preview-cli";
 
 export class PreviewCommand implements ICommand {
 	allowedParameters: ICommandParameter[] = [];
 
-	constructor(private $errors: IErrors) {}
+	constructor(
+		private $logger: ILogger,
+		private $errors: IErrors,
+		private $projectData: IProjectData,
+		private $packageManager: IPackageManager,
+		private $childProcess: IChildProcess,
+		private $options: IOptions
+	) {}
+
+	private getPreviewCLIPath(): string {
+		return resolvePackagePath(PREVIEW_CLI_PACKAGE, {
+			paths: [this.$projectData.projectDir],
+		});
+	}
 
 	async execute(args: string[]): Promise<void> {
-		this.$errors.fail(
-			`The Preview service has been disabled until further notice.\n\n` +
-				`Configure local builds and use "ns run ${args.join(" ")}" instead.`
-		);
+		if (!this.$options.disableNpmInstall) {
+			// ensure latest is installed
+			await this.$packageManager.install(
+				`${PREVIEW_CLI_PACKAGE}@latest`,
+				this.$projectData.projectDir,
+				{
+					"save-dev": true,
+					"save-exact": true,
+				} as any
+			);
+		}
+
+		const previewCLIPath = this.getPreviewCLIPath();
+
+		if (!previewCLIPath) {
+			const packageManagerName = await this.$packageManager.getPackageManagerName();
+			let installCommand = "";
+
+			switch (packageManagerName) {
+				case PackageManagers.npm:
+					installCommand = "npm install --save-dev @nativescript/preview-cli";
+					break;
+				case PackageManagers.yarn:
+					installCommand = "yarn add -D @nativescript/preview-cli";
+					break;
+				case PackageManagers.pnpm:
+					installCommand = "pnpm install --save-dev @nativescript/preview-cli";
+					break;
+			}
+			this.$logger.info(
+				[
+					`Uhh ohh, no Preview CLI found.`,
+					"",
+					`This should not happen under regular circumstances, but seems like it did somehow... :(`,
+					`Good news though, you can install the Preview CLI by running`,
+					"",
+					"  " + installCommand.green,
+					"",
+					"Once installed, run this command again and everything should work!",
+					"If it still fails, you can invoke the preview-cli directly as a last resort with",
+					"",
+					"  ./node_modules/.bin/preview-cli".cyan,
+					"",
+					"And if you are still having issues, try again - or reach out on Discord/open an issue on GitHub.",
+				].join("\n")
+			);
+
+			this.$errors.fail("Running preview failed.");
+		}
+
+		const previewCLIBinPath = path.resolve(previewCLIPath, "./dist/index.js");
+
+		const commandIndex = process.argv.indexOf("preview");
+		const commandArgs = process.argv.slice(commandIndex + 1);
+		this.$childProcess.spawn(previewCLIBinPath, commandArgs, {
+			stdio: "inherit",
+		});
 	}
 
 	async canExecute(args: string[]): Promise<boolean> {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "nativescript",
   "preferGlobal": true,
-  "version": "8.2.3",
+  "version": "8.3.0-beta.0",
   "author": "NativeScript <[email protected]>",
   "description": "Command-line interface for building NativeScript projects",
   "bin": {
@@ -106,7 +106,7 @@
     "shelljs": "0.8.4",
     "simple-git": "^2.20.1",
     "simple-plist": "1.1.0",
-    "source-map": "0.7.3",
+    "source-map": "0.7.4",
     "stringify-package": "1.0.1",
     "tabtab": "https://github.com/Icenium/node-tabtab/tarball/master",
     "tar": "6.0.2",

yarn.lock

@@ -6594,10 +6594,10 @@
   "resolved" "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz"
   "version" "0.4.0"
 
-"source-map@*", "[email protected].3":
-  "integrity" "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ=="
-  "resolved" "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz"
-  "version" "0.7.3"
+"source-map@*", "[email protected].4":
+  "integrity" "sha512-l3BikUxvPOcn5E74dZiq5BGsTb5yEwhaTSzccU6t4sDOH8NWJCstKO5QT2CvtFoK6F0saL7p9xHAqHOlCPJygA=="
+  "resolved" "https://registry.npmjs.org/source-map/-/source-map-0.7.4.tgz"
+  "version" "0.7.4"
 
 "source-map@^0.5.6":
   "integrity" "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="