Add docs staging to 0x.js package

packages/0x.js/scripts/stagedocs.js

@@ -0,0 +1,24 @@
+const execAsync = require('async-child-process').execAsync;
+const postpublish_utils = require('../../../scripts/postpublish_utils');
+
+const cwd = __dirname + '/..';
+const S3BucketPath = 's3://staging-0xjs-docs-jsons/';
+const jsonFilePath = __dirname + '/../' + postpublish_utils.generatedDocsDirectoryName + '/index.json';
+const version = process.env.DOCS_VERSION;
+
+execAsync('JSON_FILE_PATH=' + jsonFilePath + ' PROJECT_DIR=' + __dirname + '/.. yarn docs:json', {
+    cwd,
+})
+.then(function(result) {
+    if (result.stderr !== '') {
+        throw new Error(result.stderr);
+    }
+    const fileName = 'v' + version + '.json';
+    const s3Url = S3BucketPath + fileName;
+    return execAsync('S3_URL=' + s3Url + ' yarn upload_docs_json', {
+        cwd,
+    });
+})
+.catch(function(err) {
+    console.log(err);
+});