Add eslint & prettier

.changeset/large-experts-film.md

@@ -0,0 +1,2 @@
+---
+---

.eslintrc.js

@@ -0,0 +1,28 @@
+/**
+ * This is a very stripped-down eslintrc, because @khanacademy/eslint-config
+ * assumes you're using react & flow (and requires a lot of dependencies along
+ * with it).
+ */
+const khan = require("@khanacademy/eslint-config");
+
+// Only keep the rules that have no prefix (so are included in eslint core)
+// and the prettier rule.
+const basicRules = {};
+Object.keys(khan.rules).forEach((key) => {
+    if (!key.includes("/") || key.startsWith("prettier/")) {
+        basicRules[key] = khan.rules[key];
+    }
+});
+
+module.exports = {
+    extends: ["eslint:recommended", "prettier"],
+    plugins: ["prettier"],
+    rules: basicRules,
+    env: {
+        node: true,
+    },
+    parserOptions: {
+        sourceType: "module",
+        ecmaVersion: 2022,
+    },
+};

.github/workflows/node-ci.yml

@@ -4,9 +4,11 @@ on:
   - pull_request
 
 jobs:
-  changeset:
-    name: Check for .changeset file
+  check:
+    name: Lints
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: Khan/actions@check-for-changeset-v0.0.0
+      - uses: Khan/actions@shared-node-cache-v0.0.2
+      - run: yarn lint

.prettierrc.js

@@ -0,0 +1 @@
+module.exports = require("@khanacademy/eslint-config/.prettierrc.js");

package.json

@@ -4,7 +4,16 @@
     "workspaces": [
         "actions/*"
     ],
+    "scripts": {
+        "lint": "eslint --ext .js,.mjs .",
+        "fix": "yarn lint --fix"
+    },
     "devDependencies": {
-        "@changesets/cli": "^2.22.0"
+        "@changesets/cli": "^2.22.0",
+        "eslint": "^8.15.0",
+        "eslint-config-prettier": "^8.5.0",
+        "eslint-plugin-prettier": "^4.0.0",
+        "@khanacademy/eslint-config": "^0.1.0",
+        "prettier": "^2.6.2"
     }
 }

utils/build.mjs

@@ -51,7 +51,10 @@ export const buildPackage = (name, packageJsons, monorepoName) => {
     if (packageJsons[name].dependencies) {
         const yml = `actions/${name}/dist/action.yml`;
         const actionYml = fs.readFileSync(yml, "utf8");
-        fs.writeFileSync(yml, processActionYml(name, packageJsons, actionYml, monorepoName));
+        fs.writeFileSync(
+            yml,
+            processActionYml(name, packageJsons, actionYml, monorepoName),
+        );
     }
     return dist;
 };