init setup

.babelrc

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+{
+  "presets": [
+    "@babel/preset-env",
+    "@babel/preset-react"
+  ],
+  "plugins": [
+    "@babel/plugin-proposal-class-properties"
+  ]
+}

.eslintrc

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+{
+  "parserOptions": {
+    "ecmaVersion": 10,
+    "sourceType": "module"
+  },
+  "parser": "babel-eslint",
+  "env": {
+    "es6": true,
+    "browser": true,
+    "jest": true
+  },
+  "plugins": [
+    "babel",
+    "react"
+  ],
+  "extends": [
+    "eslint:recommended",
+    "plugin:react/recommended"
+  ],
+  "rules": {
+    "no-console": "warn",
+    "indent": [
+      "error",
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "always"
+    ],
+    "space-in-parens": [
+      "error"
+    ],
+    "space-infix-ops": "error",
+    "object-curly-spacing": [
+      "error",
+      "always"
+    ],
+    "comma-spacing": "error",
+    "space-before-function-paren": [
+      "error",
+      "never"
+    ],
+    "eol-last": [
+      "error",
+      "always"
+    ],
+    "keyword-spacing": [
+      "error",
+      {
+        "before": true,
+        "after": true,
+        "overrides": {
+          "do": {
+            "after": false
+          },
+          "for": {
+            "after": false
+          },
+          "if": {
+            "after": false
+          },
+          "switch": {
+            "after": false
+          },
+          "while": {
+            "after": false
+          },
+          "catch": {
+            "after": false
+          }
+        }
+      }
+    ],
+    "array-bracket-spacing": "error",
+    "babel/no-invalid-this": 1,
+    "babel/semi": 0
+  }
+}

.github/workflows/nodejs.yml

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+name: Node.js CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '14.x'
+    - run: npm ci
+    - run: npm test
+      env:
+        CI: true

.gitignore

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+node_modules
+.env
+dist

__mocks__/fileMock.js

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+// eslint-disable-next-line
+module.exports = '/path/image';