chore: add root lint tooling and ci lint job

Add shared repo-level linting once the workspace structure is already in place,
rather than mixing formatting policy into the initial monorepo bootstrap.

Move the common development tooling to the root manifest to match the
dotcom-reliability-kit monorepo pattern, add a root Biome config, and expose a
root npm run lint command. Wire that into CircleCI as a separate lint job so
test failures and style failures stay distinct in review and in CI output.

Clean up scripts/create-consent-csv.js as part of this step so the repo can
actually pass the new lint gate. The intent here is to make the lint
introduction real, not to weaken the rules or special-case existing files.

Author: leafrogers

.circleci/config.yml

@@ -42,8 +42,16 @@ jobs:
           name: Run repo tests
           command: npm test
 
+  lint:
+    <<: *container_config_node
+    steps:
+      - *attach_workspace
+      - run:
+          name: Run repo linting
+          command: npm run lint
+
 workflows:
-  test:
+  test-and-lint:
     jobs:
       - install:
           name: install-v<< matrix.node-version >>
@@ -57,3 +65,7 @@ workflows:
           matrix:
             parameters:
               node-version: ["26.2", "24.15", "22.22"]
+      - lint:
+          name: lint-v24.15
+          requires:
+            - install-v24.15

README.md

@@ -22,9 +22,10 @@ npm install
 
 ## Commands
 
-Run workspace tests from the repo root:
+Run repo checks from the repo root:
 
 ```bash
+npm run lint
 npm test
 ```
 

biome.json

@@ -0,0 +1,28 @@
+{
+	"$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+	"extends": ["./node_modules/@dotcom-reliability-kit/biome-config/config.json"],
+	"formatter": {
+		"indentStyle": "tab",
+		"indentWidth": 4,
+		"lineWidth": 100
+	},
+	"linter": {
+		"rules": {
+			"suspicious": {
+				"noExplicitAny": "off"
+			}
+		}
+	},
+	"javascript": {
+		"formatter": {
+			"quoteStyle": "single",
+			"jsxQuoteStyle": "double",
+			"trailingCommas": "none"
+		}
+	},
+	"json": {
+		"formatter": {
+			"enabled": false
+		}
+	}
+}

package-lock.json

@@ -1,6 +1,7 @@
 {
   "name": "ip-martech-tooling",
   "version": "0.0.0",
+  "type": "module",
   "private": true,
   "description": "Shareable tooling and common packages for Martech engineers.",
   "repository": {
@@ -14,8 +15,14 @@
     "packages/*"
   ],
   "scripts": {
+    "lint": "biome check",
     "test": "npm run test --workspaces --if-present"
   },
+  "devDependencies": {
+    "@biomejs/biome": "^2.4.16",
+    "@dotcom-reliability-kit/biome-config": "^1.0.0",
+    "typescript": "^5.8.3"
+  },
   "engines": {
     "node": "^22.12 || ^24 || ^26"
   }

package.json

@@ -17,35 +17,38 @@ If you want to create files each with 10,000 records:
 node ./create-consent-csv.js 10000
 */
 
-const fs = require("fs");
+const fs = require('node:fs');
 const { v4: uuid } = require('uuid');
 const now = new Date();
 
+const log = (message) => {
+	process.stdout.write(`${message}\n`);
+};
+
 const createCsv = (numberOfRows) => {
-  console.log("Starting process...");
-  const consentFields =
-    `marketing-email,accept,${now / 1000},unlimited`;
-
-  console.log(`Creating email data. ${numberOfRows} records...`);
-
-  const csvEmailData = Array.from(Array(numberOfRows)).map((row) => {
-    return [(`${now.getDate()}-${now.getMonth()+1}-${uuid()}-test@test.com`)];
-  });
-
-  console.log("Writing to file...");
-  const fileEmail = fs.createWriteStream("email.csv");
-  const fileConsent = fs.createWriteStream("consent.csv");
-
-  fileEmail.write("email" + "\n");
-  fileConsent.write("email,category,action,timestamp,valid_until" + "\n");
-  csvEmailData.forEach(function (v) {
-    fileEmail.write(v.join(",") + "\n");
-    fileConsent.write(v.join(",") + ',' + consentFields + "\n");
-  });
-  fileEmail.end();
-  fileConsent.end();
-  console.log("Completed!!");
+	log('Starting process...');
+	const consentFields = `marketing-email,accept,${now / 1000},unlimited`;
+
+	log(`Creating email data. ${numberOfRows} records...`);
+
+	const csvEmailData = Array.from({ length: numberOfRows }).map(() => {
+		return [`${now.getDate()}-${now.getMonth() + 1}-${uuid()}-test@test.com`];
+	});
+
+	log('Writing to file...');
+	const fileEmail = fs.createWriteStream('email.csv');
+	const fileConsent = fs.createWriteStream('consent.csv');
+
+	fileEmail.write('email\n');
+	fileConsent.write('email,category,action,timestamp,valid_until\n');
+	csvEmailData.forEach((entry) => {
+		fileEmail.write(`${entry.join(',')}\n`);
+		fileConsent.write(`${entry.join(',')},${consentFields}\n`);
+	});
+	fileEmail.end();
+	fileConsent.end();
+	log('Completed!!');
 };
-console.log(process.argv[2]);
-const count = process.argv[2] ? process.argv[2] : 10;
+
+const count = process.argv[2] ?? 10;
 createCsv(+count);