Create send-slack-action

.gitignore

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+node_modules
+lib

README.md

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+# Send Slack Message
+
+This is a GitHub action to send a Slack message using a Slack bot token.
+
+## Set up
+
+See https://api.slack.com/bot-users for information on setting up and installing a Slack Bot.
+
+## Inputs
+
+- `message`: The Slack message to send
+
+- `slack-token`: The Slack bot user access token
+
+- `channel`: The Slack channel ID to send the message to
+
+## Example Usage
+
+
+```yaml
+      - name: Post message
+        uses: joshmgross/send-slack-message@main
+        with:
+          message: 'Hello world'
+          channel: ${{ secrets.SLACK_CHANNEL_ID }}
+          slack-token: ${{ secrets.SLACK_BOT_TOKEN }}
+```

action.yml

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+name: 'Send Slack Message'
+description: 'Sends a slack message'
+author: 'joshmgross'
+inputs:
+  message:
+    required: true
+    description: 'The Slack message to send'
+  slack-token:
+    required: true
+    description: 'A bot user access token, see https://api.slack.com/bot-users'
+  channel:
+    required: true
+    description: 'The Slack channel ID'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'

package.json

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+{
+  "name": "send-slack-message",
+  "version": "1.0.0",
+  "description": "A GitHub action to send a Slack message",
+  "main": "dist/index.js",
+  "private": true,
+  "scripts": {
+    "build": "tsc",
+    "pack": "ncc build src/index.ts"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/joshmgross/send-slack-message.git"
+  },
+  "keywords": [
+    "Actions",
+    "node"
+  ],
+  "author": "joshmgross",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/joshmgross/send-slack-message.git"
+  },
+  "homepage": "https://github.com/joshmgross/send-slack-message.git",
+  "dependencies": {
+    "@actions/core": "^1.2.6",
+    "@slack/web-api": "^5.13.0"
+  },
+  "devDependencies": {
+    "@types/node": "^12.12.47",
+    "@zeit/ncc": "^0.22.3",
+    "typescript": "^3.9.5"
+  }
+}

src/index.ts

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+import { WebClient } from '@slack/web-api';
+import * as core from "@actions/core";
+
+async function run(): Promise<void> {
+    try {
+        // Inputs and validation
+        const slackToken = core.getInput("slack-token", { required: true });
+        const channel = core.getInput("channel", { required: true });
+        const message = core.getInput("message", { required: true });
+
+        // Send slack message
+        const slackWebClient =  new WebClient(slackToken);
+        const result = await slackWebClient.chat.postMessage({
+          text: message,
+          channel: channel
+        });
+
+        if (result.ok) {
+          core.info('Slack message sent 🚀')
+        } else {
+          core.setFailed(`❌ Unable to send Slack message: ${result.error}`);
+        }
+
+    } catch (error) {
+      core.setFailed(`❌ Action failed with error: ${error}`)
+    }
+}
+
+run();

tsconfig.json

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+{
+  "compilerOptions": {
+    /* Basic Options */
+    "target": "ES2020",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "outDir": "./lib",                       /* Redirect output structure to the directory. */
+    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
+    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+  },
+  "exclude": ["node_modules"]
+}