5 files changed, 53 insertions, 3 deletions
diff --git a/packages/monorepo-scripts/src/constants.ts b/packages/monorepo-scripts/src/constants.ts
index acb4b211e..8f907ffef 100644
--- a/packages/monorepo-scripts/src/constants.ts
+++ b/packages/monorepo-scripts/src/constants.ts
@@ -5,5 +5,6 @@ export const constants = {
     stagingWebsite: 'http://staging-0xproject.s3-website-us-east-1.amazonaws.com',
     lernaExecutable: path.join('node_modules', '@0x-lerna-fork', 'lerna', 'cli.js'),
     githubPersonalAccessToken: process.env.GITHUB_PERSONAL_ACCESS_TOKEN_0X_JS,
+    discordAlertWebhookUrl: process.env.DISCORD_GITHUB_RELEASE_WEBHOOK_URL,
     dependenciesUpdatedMessage: 'Dependencies updated',
 };
diff --git a/packages/monorepo-scripts/src/prepublish_checks.ts b/packages/monorepo-scripts/src/prepublish_checks.ts
index 36e61714b..82eaf5cf9 100644
--- a/packages/monorepo-scripts/src/prepublish_checks.ts
+++ b/packages/monorepo-scripts/src/prepublish_checks.ts
@@ -140,6 +140,13 @@ async function checkPublishRequiredSetupAsync(): Promise<void> {
         );
     }
 
+    // Check to see if discord URL is set up
+    if (_.isUndefined(constants.discordAlertWebhookUrl)) {
+        throw new Error(
+            'You must have a discord webhook URL set to an envVar named `DISCORD_GITHUB_RELEASE_WEBHOOK_URL`. Add it then try again.',
+        );
+    }
+
     // Check Yarn version is 1.X
     utils.log('Checking the yarn version...');
     const result = await execAsync(`yarn --version`);
diff --git a/packages/monorepo-scripts/src/publish.ts b/packages/monorepo-scripts/src/publish.ts
index 854a72b86..06b0d72ae 100644
--- a/packages/monorepo-scripts/src/publish.ts
+++ b/packages/monorepo-scripts/src/publish.ts
@@ -14,6 +14,7 @@ import { constants } from './constants';
 import { Package, PackageToNextVersion, VersionChangelog } from './types';
 import { changelogUtils } from './utils/changelog_utils';
 import { configs } from './utils/configs';
+import { alertDiscord } from './utils/discord';
 import { DocGenerateAndUploadUtils } from './utils/doc_generate_and_upload_utils';
 import { publishReleaseNotesAsync } from './utils/github_release_utils';
 import { utils } from './utils/utils';
@@ -84,7 +85,16 @@ async function confirmAsync(message: string): Promise<void> {
         await generateAndUploadDocJsonsAsync(packagesWithDocs, isStaging, shouldUploadDocs);
     }
     const isDryRun = configs.IS_LOCAL_PUBLISH;
-    await publishReleaseNotesAsync(updatedPublicPackages, isDryRun);
+    const releaseNotes = await publishReleaseNotesAsync(updatedPublicPackages, isDryRun);
+    utils.log('Published release notes');
+
+    if (!isDryRun && releaseNotes) {
+        try {
+            alertDiscord(releaseNotes);
+        } catch (e) {
+            utils.log("Couldn't alert discord, error: ", e.message, '. Please alert manually.');
+        }
+    }
 })().catch(err => {
     utils.log(err);
     process.exit(1);
diff --git a/packages/monorepo-scripts/src/utils/discord.ts b/packages/monorepo-scripts/src/utils/discord.ts
new file mode 100644
index 000000000..2482a18f0
--- /dev/null
+++ b/packages/monorepo-scripts/src/utils/discord.ts
@@ -0,0 +1,27 @@
+import { fetchAsync } from '@0x/utils';
+
+import { constants } from '../constants';
+
+import { utils } from './utils';
+
+export const alertDiscord = async (releaseNotes: string): Promise<boolean> => {
+    const webhookUrl = constants.discordAlertWebhookUrl;
+    if (!webhookUrl) {
+        utils.log('Not alerting to discord because webhook url not set');
+        return false;
+    }
+
+    utils.log('Alerting discord...');
+    const payload = {
+        content: `New monorepo package released!  View at https://github.com/0xProject/0x-monorepo/releases \n\n ${releaseNotes}`,
+    };
+    await fetchAsync(webhookUrl, {
+        method: 'POST',
+        headers: {
+            Accept: 'application/json',
+            'Content-Type': 'application/json',
+        },
+        body: JSON.stringify(payload),
+    });
+    return true;
+};
diff --git a/packages/monorepo-scripts/src/utils/github_release_utils.ts b/packages/monorepo-scripts/src/utils/github_release_utils.ts
index e63244b46..1044c25e9 100644
--- a/packages/monorepo-scripts/src/utils/github_release_utils.ts
+++ b/packages/monorepo-scripts/src/utils/github_release_utils.ts
@@ -12,7 +12,10 @@ import { utils } from './utils';
 
 const publishReleaseAsync = promisify(publishRelease);
 // tslint:disable-next-line:completed-docs
-export async function publishReleaseNotesAsync(packagesToPublish: Package[], isDryRun: boolean): Promise<void> {
+export async function publishReleaseNotesAsync(
+    packagesToPublish: Package[],
+    isDryRun: boolean,
+): Promise<string | undefined> {
     // Git push a tag representing this publish (publish-{commit-hash}) (truncate hash)
     const result = await execAsync('git log -n 1 --pretty=format:"%H"', { cwd: constants.monorepoRootPath });
     const latestGitCommit = result.stdout;
@@ -75,6 +78,8 @@ export async function publishReleaseNotesAsync(packagesToPublish: Package[], isD
 
     utils.log('Publishing release notes ', releaseName, '...');
     await publishReleaseAsync(publishReleaseConfigs);
+
+    return aggregateNotes;
 }
 
 // Asset paths should described from the monorepo root. This method prefixes
@@ -88,7 +93,7 @@ function adjustAssetPaths(assets: string[]): string[] {
     return finalAssets;
 }
 
-function getReleaseNotesForPackage(packageLocation: string, packageName: string): string {
+export function getReleaseNotesForPackage(packageLocation: string, packageName: string): string {
     const changelogJSONPath = path.join(packageLocation, 'CHANGELOG.json');
     const changelogJSON = readFileSync(changelogJSONPath, 'utf-8');
     const changelogs = JSON.parse(changelogJSON);