From 03479d06d1294bb738e200d6eac66411cd7f9add Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Fri, 10 May 2019 07:43:37 -0700
Subject: [PATCH] Publish beta and stable builds to npm automatically

---
 azure-pipelines.yml | 26 +++++++++++++++++++
 scripts/publish.js  | 62 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 scripts/publish.js

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index b078d70d6..169374311 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -21,6 +21,7 @@ jobs:
   - script: |
       npm run lint
     displayName: 'Lint'
+
 - job: macOS
   pool:
     vmImage: 'xcode9-macos10.13'
@@ -38,6 +39,7 @@ jobs:
   - script: |
       npm run lint
     displayName: 'Lint'
+
 - job: Windows
   pool:
     vmImage: 'vs2017-win2016'
@@ -55,3 +57,27 @@ jobs:
   - script: |
       npm run lint
     displayName: 'Lint'
+
+- job: Release
+  dependsOn:
+  - Linux
+  - macOS
+  - Windows
+  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'))
+  pool:
+    vmImage: 'ubuntu-16.04'
+  steps:
+  - task: NodeTool@0
+    inputs:
+      versionSpec: '8.x'
+    displayName: 'Install Node.js'
+  - task: geeklearningio.gl-vsts-tasks-yarn.yarn-installer-task.YarnInstaller@2
+    inputs:
+      versionSpec: "1.9.4"
+    displayName: 'Install Yarn'
+  - script: |
+      npm i
+    displayName: 'Install dependencies and build'
+  - script: |
+      NPM_AUTH_TOKEN="$(NPM_AUTH_TOKEN)" node ./scripts/publish.js
+    displayName: 'Publish to npm'
diff --git a/scripts/publish.js b/scripts/publish.js
new file mode 100644
index 000000000..968531e14
--- /dev/null
+++ b/scripts/publish.js
@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2019, Microsoft Corporation (MIT License).
+ */
+
+const cp = require('child_process');
+const fs = require('fs');
+const path = require('path');
+const packageJson = require('../package.json');
+
+// Setup auth
+fs.writeFileSync(`${process.env['HOME']}/.npmrc`, `//registry.npmjs.org/:_authToken=${process.env['NPM_AUTH_TOKEN']}`);
+
+// Determine if this is a stable or beta release
+const publishedVersions = getPublishedVersions();
+const isStableRelease = publishedVersions.indexOf(packageJson.version) === -1;
+
+// Get the next version
+let nextVersion = isStableRelease ? packageJson.version : getNextBetaVersion();
+console.log(`Publishing version: ${nextVersion}`);
+
+// Set the version in package.json
+const packageJsonFile = path.resolve(__dirname, '..', 'package.json');
+packageJson.version = nextVersion;
+fs.writeFileSync(packageJsonFile, JSON.stringify(packageJson, null, 2));
+
+// Publish
+const args = ['publish'];
+if (!isStableRelease) {
+  args.push('--tag', 'beta');
+}
+const result = cp.spawn('npm', args, { stdio: 'inherit' });
+result.on('exit', code => process.exit(code));
+
+function getNextBetaVersion() {
+  if (!/^[0-9]+\.[0-9]+\.[0-9]+$/.exec(packageJson.version)) {
+    console.error('The package.json version must be of the form x.y.z');
+    process.exit(1);
+  }
+  const tag = 'beta';
+  const stableVersion = packageJson.version.split('.');
+  const nextStableVersion = `${stableVersion[0]}.${parseInt(stableVersion[1]) + 1}.0`;
+  const publishedVersions = getPublishedVersions(nextStableVersion, tag);
+  if (publishedVersions.length === 0) {
+    return `${nextStableVersion}-${tag}1`;
+  }
+  const latestPublishedVersion = publishedVersions.sort((a, b) => {
+    const aVersion = parseInt(a.substr(a.search(/[0-9]+$/)));
+    const bVersion = parseInt(b.substr(b.search(/[0-9]+$/)));
+    return aVersion > bVersion ? -1 : 1;
+  })[0];
+  const latestTagVersion = parseInt(latestPublishedVersion.substr(latestPublishedVersion.search(/[0-9]+$/)), 10);
+  return `${nextStableVersion}-${tag}${latestTagVersion + 1}`;
+}
+
+function getPublishedVersions(version, tag) {
+  const versionsProcess = cp.spawnSync('npm', ['view', packageJson.name, 'versions', '--json']);
+  const versionsJson = JSON.parse(versionsProcess.stdout);
+  if (tag) {
+    return versionsJson.filter(v => !v.search(new RegExp(`${version}-${tag}[0-9]+`)));
+  }
+  return versionsJson;
+}