eslint linter added

frontend/config/jest/jest.setup.ts

@@ -1,5 +1,3 @@
-import "@testing-library/jest-dom";
-
 import { server } from "../../src/mocks/server";
 import { queryClient } from "../../src/utils/test-utils";
 import "whatwg-fetch";

frontend/package.json

@@ -56,7 +56,7 @@
     "build": "node scripts/build.js",
     "test": "node scripts/test.js",
     "format": "prettier --write **/*.{ja, jsx, ts,tsx,css}",
-    "eslint-lint": "eslint . --ext .js,.ts,.jsx,.tsx"
+    "eslint-lint": "node scripts/lint.js"
   },
   "eslintConfig": {
     "extends": [

frontend/scripts/lint.js

@@ -0,0 +1,34 @@
+// Do this as the first thing so that any code reading it knows the right env.
+process.env.BABEL_ENV = 'test';
+process.env.NODE_ENV = 'test';
+process.env.PUBLIC_URL = '';
+
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+  throw err;
+});
+
+// Ensure environment variables are read.
+require('../config/env');
+
+const { ESLint } = require("eslint");
+
+(async function main() {
+    // 1. Create an instance.
+    const eslint = new ESLint();
+
+    // 2. Lint files.
+    const results = await eslint.lintFiles(["**/*{.js, .ts, .jsx, .tsx, .css}"]);
+
+    // 3. Format the results.
+    const formatter = await eslint.loadFormatter("stylish");
+    const resultText = formatter.format(results);
+
+    // 4. Output it.
+    console.log(resultText);
+})().catch((error) => {
+    process.exitCode = 1;
+    console.error(error);
+});