fix: list all valid targets in documentation for --target (#766)

Fixes: #763

src/main.ts

@@ -1,6 +1,6 @@
 import program from 'commander';
 import leven from 'leven';
-import { packageCommand, ls } from './package';
+import { packageCommand, ls, Targets } from './package';
 import { publish, unpublish } from './publish';
 import { show } from './show';
 import { search } from './search';
@@ -55,6 +55,8 @@ function main(task: Promise<any>): void {
 	});
 }
 
+const ValidTargets = [...Targets].join(', ');
+
 module.exports = function (argv: string[]): void {
 	program.version(pkg.version).usage('<command>');
 
@@ -81,7 +83,7 @@ module.exports = function (argv: string[]): void {
 		.command('package [version]')
 		.description('Packages an extension')
 		.option('-o, --out <path>', 'Output .vsix extension file to <path> location (defaults to <name>-<version>.vsix)')
-		.option('-t, --target <target>', 'Target architecture')
+		.option('-t, --target <target>', `Target architecture. Valid targets: ${ValidTargets}`)
 		.option('-m, --message <commit message>', 'Commit message used when calling `npm version`.')
 		.option(
 			'--no-git-tag-version',
@@ -167,7 +169,7 @@ module.exports = function (argv: string[]): void {
 			'Personal Access Token (defaults to VSCE_PAT environment variable)',
 			process.env['VSCE_PAT']
 		)
-		.option('-t, --target <targets...>', 'Target architectures')
+		.option('-t, --target <targets...>', `Target architectures. Valid targets: ${ValidTargets}`)
 		.option('-m, --message <commit message>', 'Commit message used when calling `npm version`.')
 		.option(
 			'--no-git-tag-version',

src/package.ts

@@ -350,7 +350,7 @@ export async function versionBump(options: IVersionBumpOptions): Promise<void> {
 	}
 }
 
-const Targets = new Set([
+export const Targets = new Set([
 	'win32-x64',
 	'win32-ia32',
 	'win32-arm64',