Add a binary to run the generator.

Author: aomarks

bin/gen-typescript-declarations

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved. This
+ * code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt The complete set of authors may be
+ * found at http://polymer.github.io/AUTHORS.txt The complete set of
+ * contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt Code
+ * distributed by Google as part of the polymer project is also subject to an
+ * additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+'use strict';
+
+require('../lib/cli.js');
+

package-lock.json

@@ -4,10 +4,13 @@
   "description": "Generate TypeScript type declarations for Polymer components.",
   "main": "lib/gen-ts.js",
   "types": "lib/gen-ts.d.ts",
+  "bin": "bin/gen-typescript-declarations",
   "directories": {
     "lib": "lib"
   },
   "dependencies": {
+    "command-line-args": "^4.0.7",
+    "command-line-usage": "^4.0.1",
     "escodegen": "^1.9.0",
     "polymer-analyzer": "^2.3.0"
   },

package.json

@@ -0,0 +1,80 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved. This
+ * code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt The complete set of authors may be
+ * found at http://polymer.github.io/AUTHORS.txt The complete set of
+ * contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt Code
+ * distributed by Google as part of the polymer project is also subject to an
+ * additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+import * as fs from 'fs';
+import {generateDeclarations} from './gen-ts';
+
+const commandLineArgs = require('command-line-args') as any;
+const commandLineUsage = require('command-line-usage') as any;
+
+const argDefs = [
+  {
+    name: 'help',
+    type: Boolean,
+    description: 'Print this help text.',
+  },
+  {
+    name: 'version',
+    type: Boolean,
+    description: 'Print the installed version.',
+  },
+  {
+    name: 'root',
+    type: String,
+    defaultValue: '.',
+    description: 'Root directory of the package to analyze (default ".").',
+  },
+  {
+    name: 'out',
+    type: String,
+    description: 'Type declarations output file path (default stdout).',
+  },
+];
+
+async function run(argv: string[]) {
+  const args = commandLineArgs(argDefs, {argv});
+
+  if (args.help) {
+    console.log(commandLineUsage([
+      {
+        header: `gen-typescript-declarations`,
+        content: 'https://github.com/Polymer/gen-typescript-declarations',
+      },
+      {
+        header: `Options`,
+        optionList: argDefs,
+      }
+    ]));
+    return;
+  }
+
+  if (args.version) {
+    console.log(require('../package.json').version);
+    return;
+  }
+
+  const declarations = await generateDeclarations(args.root);
+
+  if (args.out) {
+    fs.writeFileSync(args.out, declarations);
+  } else {
+    process.stdout.write(declarations);
+  }
+}
+
+(async () => {
+  try {
+    await run(process.argv);
+  } catch (e) {
+    console.error(e);
+    process.exit(1);
+  }
+})();

src/cli.ts

@@ -27,9 +27,9 @@ const header = `declare namespace Polymer {
 `;
 const footer = `}`;
 
-export function generateDeclarations(): Promise<string> {
+export function generateDeclarations(root: string): Promise<string> {
   const analyzer = new Analyzer({
-    urlLoader: new FSUrlLoader(),
+    urlLoader: new FSUrlLoader(root),
     urlResolver: new PackageUrlResolver(),
   });