Update script to parse all specs in folder

Summary:
Updates the combine-js-to-schema to expose a cli and combine all passed files into a single schema output

Note: as far as I could tell, there isn't a way for buck to pass a glob of directories, so instead of accepting a dir and crawling it, this update accepts a list of files and combines them. Which makes sense, since buck is good at crawling already

Reviewed By: TheSavior

Differential Revision: D14007193

fbshipit-source-id: dbc209bb8d1cadd381269e9f70dc71a90f77878e

packages/react-native-codegen/buck_tests/__tests__/__snapshots__/combine-js-to-schema-test.js.snap

@@ -0,0 +1,14 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`should combine files 1`] = `
+Object {
+  "modules": Object {
+    "ComponentOne": Object {
+      "foo": "baz",
+    },
+    "ComponentTwo": Object {
+      "foo": "bar",
+    },
+  },
+}
+`;

packages/react-native-codegen/buck_tests/__tests__/combine-js-to-schema-test.js

@@ -0,0 +1,48 @@
+/**
+ * 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.
+ *
+ * @emails oncall+react_native
+ * @flow strict-local
+ * @format
+ */
+
+import combine from '../combine-js-to-schema';
+
+jest.mock(
+  '/test/module/SchemaOne',
+  () => ({
+    modules: {
+      ComponentOne: {
+        foo: 'baz',
+      },
+    },
+  }),
+  {virtual: true},
+);
+
+jest.mock(
+  '/test/module/SchemaTwo',
+  () => ({
+    modules: {
+      ComponentTwo: {
+        foo: 'bar',
+      },
+    },
+  }),
+  {virtual: true},
+);
+
+test('should combine files', () => {
+  const files = ['/test/module/SchemaOne', '/test/module/SchemaTwo'];
+  expect(combine(files)).toMatchSnapshot();
+});
+
+test('should throw for failed require', () => {
+  const files = ['/test/module/does/not/exist'];
+  expect(() => combine(files)).toThrow(
+    "Can't require file at /test/module/does/not/exist",
+  );
+});

packages/react-native-codegen/buck_tests/combine-js-to-schema-cli.js

@@ -0,0 +1,24 @@
+/**
+ * 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.
+ *
+ * @emails oncall+react_native
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+const combine = require('./combine-js-to-schema');
+const fs = require('fs');
+
+const [outfile, ...fileList] = process.argv.slice(2);
+
+const formattedSchema = JSON.stringify(combine(fileList), null, 2);
+if (outfile != null) {
+  fs.writeFileSync(outfile, formattedSchema);
+} else {
+  console.log(formattedSchema);
+}

packages/react-native-codegen/buck_tests/combine-js-to-schema.js

@@ -9,28 +9,26 @@
  */
 
 'use strict';
+import type {SchemaType} from '../src/CodegenSchema.js';
 
-const fs = require('fs');
+function parse(filename: string): SchemaType {
+  try {
+    // $FlowFixMe Can't require dynamic variables
+    return require(filename);
+  } catch (err) {
+    throw new Error(`Can't require file at ${filename} ${err}`);
+  }
+}
 
-const args = process.argv.slice(2);
-if (args.length !== 2) {
-  throw new Error(
-    'Expected to receive the input path and output path as arguments',
+function combineSchemas(files: Array<string>): SchemaType {
+  return files.reduce(
+    (merged, filename) => {
+      const schema = parse(filename);
+      merged.modules = {...merged.modules, ...schema.modules};
+      return merged;
+    },
+    {modules: {}},
   );
 }
 
-const src = args[0];
-const outputPath = args[1];
-
-let file;
-
-try {
-  // Eventually this will be replaced with a script that reads and parses
-  // the file via ast
-  // $FlowFixMe Can't require dynamic variables
-  file = require(src);
-} catch (err) {
-  throw new Error(`Can't require file at ${src}`);
-}
-
-fs.writeFileSync(outputPath, JSON.stringify(file, null, 2));
+module.exports = combineSchemas;

packages/react-native-codegen/buck_tests/combine_js_to_schema.sh

@@ -8,4 +8,4 @@ THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOUR
 # shellcheck source=xplat/js/env-utils/setup_env_vars.sh
 source "$THIS_DIR/../../../../env-utils/setup_env_vars.sh"
 
-exec "$FLOW_NODE_BINARY" "$THIS_DIR/combine-js-to-schema.js" "$@"
+exec "$FLOW_NODE_BINARY" "$THIS_DIR/combine-js-to-schema-cli.js" "$@"