feat(add): Add minimum Node.js version warning if below 16.

.changeset/great-bags-smoke.md

@@ -0,0 +1,5 @@
+---
+'sv': patch
+---
+
+feat: print warning if using Node.js version below 18.3

packages/cli/utils/common.ts

@@ -4,6 +4,7 @@ import * as p from '@clack/prompts';
 import type { Argument, HelpConfiguration, Option } from 'commander';
 import { UnsupportedError } from './errors.ts';
 import process from 'node:process';
+import { isVersionUnsupportedBelow } from '@sveltejs/cli-core';
 
 const NO_PREFIX = '--no-';
 let options: readonly Option[] = [];
@@ -75,6 +76,15 @@ type MaybePromise = () => Promise<void> | void;
 export async function runCommand(action: MaybePromise): Promise<void> {
 	try {
 		p.intro(`Welcome to the Svelte CLI! ${pc.gray(`(v${pkg.version})`)}`);
+
+		const minimumVersion = '18.3.0';
+		const unsupported = isVersionUnsupportedBelow(process.versions.node, minimumVersion);
+		if (unsupported) {
+			p.log.warn(
+				`You are using Node.js ${pc.red(process.versions.node)}, please upgrade to Node.js ${pc.green(minimumVersion)} or higher.`
+			);
+		}
+
 		await action();
 		p.outro("You're all set!");
 	} catch (e) {

packages/core/common.ts

@@ -0,0 +1,48 @@
+type Version = {
+	major?: number;
+	minor?: number;
+	patch?: number;
+};
+
+export function splitVersion(str: string): Version {
+	const [major, minor, patch] = str?.split('.') ?? [];
+
+	function toVersionNumber(val: string | undefined): number | undefined {
+		return val !== undefined && val !== '' && !isNaN(Number(val)) ? Number(val) : undefined;
+	}
+
+	return {
+		major: toVersionNumber(major),
+		minor: toVersionNumber(minor),
+		patch: toVersionNumber(patch)
+	};
+}
+
+export function isVersionUnsupportedBelow(
+	versionStr: string,
+	belowStr: string
+): boolean | undefined {
+	const version = splitVersion(versionStr);
+	const below = splitVersion(belowStr);
+
+	if (version.major === undefined || below.major === undefined) return undefined;
+	if (version.major < below.major) return true;
+	if (version.major > below.major) return false;
+
+	if (version.minor === undefined || below.minor === undefined) {
+		if (version.major === below.major) return false;
+		else return true;
+	}
+	if (version.minor < below.minor) return true;
+	if (version.minor > below.minor) return false;
+
+	if (version.patch === undefined || below.patch === undefined) {
+		if (version.minor === below.minor) return false;
+		else return true;
+	}
+	if (version.patch < below.patch) return true;
+	if (version.patch > below.patch) return false;
+	if (version.patch === below.patch) return false;
+
+	return undefined;
+}

packages/core/index.ts

@@ -3,6 +3,7 @@ export { log } from '@clack/prompts';
 export { default as colors } from 'picocolors';
 export { default as dedent } from 'dedent';
 export * as utils from './utils.ts';
+export { isVersionUnsupportedBelow, splitVersion } from './common.ts';
 
 export type * from './addon/processors.ts';
 export type * from './addon/options.ts';

packages/core/tests/common.ts

@@ -0,0 +1,48 @@
+import { expect, describe, it } from 'vitest';
+import { splitVersion, isVersionUnsupportedBelow } from '../common.ts';
+
+describe('versionSplit', () => {
+	const combinationsVersionSplit = [
+		{ version: '18.13.0', expected: { major: 18, minor: 13, patch: 0 } },
+		{ version: 'x.13.0', expected: { major: undefined, minor: 13, patch: 0 } },
+		{ version: '18.y.0', expected: { major: 18, minor: undefined, patch: 0 } },
+		{ version: '18.13.z', expected: { major: 18, minor: 13, patch: undefined } },
+		{ version: '18', expected: { major: 18, minor: undefined, patch: undefined } },
+		{ version: '18.13', expected: { major: 18, minor: 13, patch: undefined } },
+		{ version: 'invalid', expected: { major: undefined, minor: undefined, patch: undefined } }
+	];
+	it.each(combinationsVersionSplit)(
+		'should return the correct version for $version',
+		({ version, expected }) => {
+			expect(splitVersion(version)).toEqual(expected);
+		}
+	);
+});
+
+describe('minimumRequirement', () => {
+	const combinationsMinimumRequirement = [
+		{ version: '17', below: '18.3.0', expected: true },
+		{ version: '18.2', below: '18.3.0', expected: true },
+		{ version: '18.3.0', below: '18.3.1', expected: true },
+		{ version: '18.3.1', below: '18.3.0', expected: false },
+		{ version: '18.3.0', below: '18.3.0', expected: false },
+		{ version: '18.3.0', below: '18.3', expected: false },
+		{ version: '18.3.1', below: '18.3', expected: false },
+		{ version: '18.3.1', below: '18', expected: false },
+		{ version: '18', below: '18', expected: false },
+		{ version: 'a', below: 'b', expected: undefined },
+		{ version: '18.3', below: '18.3', expected: false },
+		{ version: '18.4', below: '18.3', expected: false },
+		{ version: '18.2', below: '18.3', expected: true },
+
+		// if it's undefined, we can't say anything...
+		{ version: undefined!, below: '18.3', expected: undefined },
+		{ version: '', below: '18.3', expected: undefined }
+	] as const;
+	it.each(combinationsMinimumRequirement)(
+		'($version below $below) should be $expected',
+		({ version, below, expected }) => {
+			expect(isVersionUnsupportedBelow(version, below)).toEqual(expected);
+		}
+	);
+});