[test] Lint JSON

.circleci/config.yml

@@ -62,8 +62,11 @@ jobs:
           name: '`yarn prettier` changes committed?'
           command: yarn prettier check-changed
       - run:
-          name: Lint
-          command: yarn lint:ci
+          name: Eslint
+          command: yarn eslint:ci
+      - run:
+          name: Lint JSON
+          command: yarn jsonlint
 workflows:
   version: 2
   pipeline:

package.json

@@ -47,14 +47,16 @@
   },
   "scripts": {
     "deduplicate": "node scripts/deduplicate.js",
+    "jsonlint": "node scripts/jsonlint.js",
     "hoist": "lerna bootstrap --hoist",
     "bootstrap": "lerna bootstrap",
     "build": "lerna run build --stream",
     "start": "lerna run start --parallel",
     "prettier": "node ./scripts/prettier.js",
     "test": "lerna run test --parallel",
-    "lint": "eslint . --cache --report-unused-disable-directives --ext .js,.ts,.tsx",
-    "lint:ci": "eslint . --report-unused-disable-directives --ext .js,.ts,.tsx"
+    "lint": "yarn eslint && yarn jsonlint",
+    "eslint": "eslint . --cache --report-unused-disable-directives --ext .js,.ts,.tsx",
+    "eslint:ci": "eslint . --report-unused-disable-directives --ext .js,.ts,.tsx"
   },
   "setupFiles": [
     "<rootDir>/src/setupTests.js"

scripts/jsonlint.js

@@ -0,0 +1,44 @@
+/* eslint-disable no-console */
+const chalk = require('chalk');
+const fse = require('fs-extra');
+const glob = require('glob-gitignore');
+const path = require('path');
+
+const passMessage = (message) => `✓ ${chalk.gray(message)}`;
+const failMessage = (message) => `✗ ${chalk.whiteBright(message)}`;
+
+async function run() {
+  const workspaceRoot = path.resolve(__dirname, '..');
+
+  const eslintignoreContent = await fse.readFile(path.join(workspaceRoot, '.eslintignore'), {
+    encoding: 'utf8',
+  });
+  const eslintignore = eslintignoreContent.split(/\r?\n/).slice(0, -1);
+
+  const filenames = glob.sync('**/*.json', {
+    cwd: workspaceRoot,
+    ignore: [...eslintignore, 'tsconfig*.json', 'tslint.json'],
+  });
+
+  let passed = true;
+  const checks = filenames.map(async (filename) => {
+    const content = await fse.readFile(path.join(workspaceRoot, filename), { encoding: 'utf8' });
+    try {
+      JSON.parse(content);
+      console.log(passMessage(filename));
+    } catch (error) {
+      passed = false;
+      console.error(failMessage(`Error parsing ${filename}:\n\n${String(error)}`));
+    }
+  });
+
+  await Promise.all(checks);
+  if (passed === false) {
+    throw new Error('At least one file did not pass. Check the console output');
+  }
+}
+
+run().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});