Initial commit of Github auto-merge action

.gitignore

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+node_modules

.nvmrc

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+v12

action.yml

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+name: 'Enable Github Automerge'
+description: 'Enable Github auto-merge for specific pull-requests'
+branding:
+  icon: 'git-merge'
+  color: 'green'
+inputs:
+  github-token:
+    description: 'The GITHUB_TOKEN secret'
+    required: true
+runs:
+  using: 'node12'
+  main: 'dist/index.js'

package.json

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+{
+  "name": "enable-github-automerge-action",
+  "version": "0.0.0-alpha.1",
+  "description": "",
+  "main": "dist/main.ts",
+  "scripts": {
+    "build": "ncc build src/main.ts",
+    "format": "prettier --write **/*.ts",
+    "format-check": "prettier --check **/*.ts"
+  },
+  "author": "Alex Wilson <[email protected]>",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^14.14.25",
+    "@vercel/ncc": "^0.27.0",
+    "prettier": "^2.2.1",
+    "typescript": "^4.1.3"
+  },
+  "dependencies": {
+    "@actions/core": "^1.2.6",
+    "@actions/github": "^4.0.0"
+  }
+}

src/main.ts

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+import * as core from "@actions/core";
+import * as github from "@actions/github";
+
+async function run() {
+  try {
+    const token = core.getInput("github-token", { required: true });
+    const client = github.getOctokit(token);
+
+    const { pull_request: pullRequest } = github.context.payload;
+    if (!pullRequest) {
+      throw new Error("Event payload missing `pull_request`");
+    }
+
+    core.debug(`Enabling auto-merge for pull-request #${pullRequest.number}`);
+    client.graphql(`
+        mutation {
+            enablePullRequestAutoMerge(input:{
+            pullRequestId: "${pullRequest.node_id}"
+          }) {
+            clientMutationId
+            pullRequest {
+              id
+              state
+            }
+          }
+        }
+    `);
+    core.debug(
+      `Successfully enabled auto-merge for pull-request #${pullRequest.number}`
+    );
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();

tsconfig.json

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+{
+    "compilerOptions": {
+      "target": "es6",
+      "module": "commonjs",
+      "outDir": "./lib",
+      "rootDir": "./src",
+      "strict": true,
+      "noImplicitAny": false,
+      "esModuleInterop": true
+    },
+    "exclude": ["node_modules", "**/*.test.ts"]
+  }
+