.eslintrc.js

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+/*!
+ * Copyright 2020 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+  rules: {
+    // Following checks are temporarily disabled. We shall incrementally enable them in the
+    // future, fixing any violations as we go.
+    '@typescript-eslint/no-non-null-assertion': 0,
+
+    // Disabled checks
+    '@typescript-eslint/no-explicit-any': 0,
+    '@typescript-eslint/no-use-before-define': 0,
+
+    // Required checks
+    'indent': ['error', 2],
+    '@typescript-eslint/explicit-function-return-type': [
+      'error',
+      {
+        'allowExpressions': true,
+        'allowTypedFunctionExpressions': true,
+        'allowHigherOrderFunctions': true
+      }
+    ],
+  }
+};

.github/actions/send-tweet/README.md

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+# Send Tweet GitHub Action
+
+This is a minimalistic GitHub Action for posting Firebase release announcements
+to Twitter. Simply specify the Twitter API keys along with the Tweet status to
+be posted.
+
+## Inputs
+
+### `status`
+
+**Required** Text of the Tweet to send.
+
+### `consumer-key`
+
+**Required** Consumer API key from Twitter.
+
+### `consumer-secret`
+
+**Required** Consumer API secret key from Twitter.
+
+### `access-token`
+
+**Required** Twitter application access token.
+
+### `access-token-secret`
+
+**Required** Twitter application access token secret.
+
+## Example usage
+
+```
+- name: Send Tweet
+  uses: firebase/firebase-admin-node/.github/actions/send-tweet
+  with:
+    status: >
+      v1.2.3 of @Firebase Admin Node.js SDK is available.
+      Release notes at https://firebase.google.com.
+    consumer-key: ${{ secrets.TWITTER_CONSUMER_KEY }}
+    consumer-secret: ${{ secrets.TWITTER_CONSUMER_SECRET }}
+    access-token: ${{ secrets.TWITTER_ACCESS_TOKEN }}
+    access-token-secret: ${{ secrets.TWITTER_ACCESS_TOKEN_SECRET }}
+```
+
+## Implementation
+
+This Action uses the `twitter` NPM package to send Tweets.
+
+When making a code change remember to run `npm run pack` to rebuild the
+`dist/index.js` file which is the executable of this Action.

.github/actions/send-tweet/action.yml

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+# Copyright 2020 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 'Send Tweet Action'
+description: 'Send Tweets from GitHub Actions workflows.'
+inputs:
+  repo:
+    status: Status (Tweet) to be posted
+    required: true
+  consumer-key:
+    description: Consumer API key.
+    required: true
+  consumer-secret:
+    description: Consumer API secret key.
+    required: true
+  access-token:
+    description: Application access token.
+    required: true
+  access-token-secret:
+    description: Application access token secret.
+    required: true
+runs:
+  using: 'node12'
+  main: 'dist/index.js'