Set up separate cli tool

Summary:
Discussed that we want this to be both a library and a CLI
tool. Also added a README stub.

Reviewed By: nikoant

Differential Revision: D19969788

fbshipit-source-id: 2c54935ce5953d2053c7bdf601debe0e5e911647

pkg/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) Facebook, Inc. and its affiliates.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pkg/README.md

@@ -0,0 +1,8 @@
+# flipper-pkg
+
+`flipper-pkg` is a **work-in-progress** tool for bundling and publishing
+Flipper plugins.
+
+## License
+
+[MIT](LICENSE)

pkg/package.json

@@ -29,7 +29,7 @@
     "test": "jest --config jestconfig.json --passWithNoTests",
     "lint": "eslint -c ../../sonar/.eslintrc.js src/**/* --ext .js,.ts  && tsc --noemit",
     "fix": "eslint -c ../../sonar/.eslintrc.js src/**/* --fix --ext .js,.ts",
-    "run": "yarn run build && node lib/index.js"
+    "run": "yarn run build && node lib/cli.js"
   },
   "files": [
     "lib/**/*"

pkg/src/cli.ts

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {PKG} from '.';
+
+(async () => {
+  console.log(`Hello, ${PKG}.`);
+})();

pkg/src/index.ts

@@ -7,6 +7,4 @@
  * @format
  */
 
-(async () => {
-  console.log('Hello, flipper-pkg.');
-})();
+export const PKG = 'flipper-pkg';