feat: lint, test and precommit hook

.eslintignore

@@ -0,0 +1,6 @@
+.circleci/
+artifacts/
+internals/
+server/
+docs/
+node_modules/

.eslintrc.json

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+{
+    "parser": "babel-eslint",
+    "extends": [
+        "airbnb",
+        "prettier"
+    ],
+    "env": {
+        "browser": true,
+        "node": true,
+        "jest": true,
+        "es6": true
+    },
+    "plugins": [
+        "import",
+        "jsx-a11y",
+        "react",
+        "prettier"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 6,
+        "sourceType": "module",
+        "ecmaFeatures": {
+            "jsx": true
+        }
+    },
+    "globals": {
+        "browser": false
+    },
+    "rules": {
+        "arrow-parens": [2, "as-needed"],
+        "arrow-body-style": [2, "as-needed"],
+        "class-methods-use-this": 0,
+        "no-console": 1,
+        "no-param-reassign": ["error", { "props": false }],
+        "no-trailing-spaces": 2,
+        "no-use-before-define": [2, {
+            "functions": false
+        }],
+        "import/prefer-default-export": 0,
+        "react/jsx-first-prop-new-line": [2, "multiline"],
+        "react/jsx-indent": [2, 4],
+        "react/jsx-indent-props": [2, 4],
+        "prettier/prettier": [2, {
+            "bracketSpacing": true,
+            "jsxBracketSameLine": false,
+            "semi": true,
+            "singleQuote": false,
+            "tabWidth": 4,
+            "trailingComma": "all"
+        }]
+    },
+    "settings": {
+        "import/resolver": {
+            "node": {
+                "paths": ["src"]
+            }
+        }
+    }
+}

.github/hooks/pre-commit

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+#!/bin/sh
+
+command_exists () {
+  command -v "$1" >/dev/null 2>&1
+}
+
+has_hook_script () {
+  [ -f package.json ] && cat package.json | grep -q "\"$1\"[[:space:]]*:"
+}
+
+cd "."
+
+# Check if precommit script is defined, skip if not
+has_hook_script precommit || exit 0
+
+# Check that npm exists
+command_exists npm || {
+  echo >&2 "Can't find npm in PATH, skipping precommit script in package.json"
+  exit 0
+}
+
+# Export Git hook params
+export GIT_PARAMS="$*"
+
+# Run npm script
+echo "npm run -s precommit (node `node -v`)"
+echo
+
+npm run -s precommit || {
+  echo
+  echo "pre-commit hook failed (add --no-verify to bypass)"
+  exit 1
+}

.gitignore

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+node_modules

.stylelintrc.json

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+{
+    "processors": ["stylelint-processor-styled-components"],
+    "extends": [
+        "stylelint-config-standard",
+        "stylelint-config-styled-components"
+    ],
+    "syntax": "scss",
+    "rules": {
+        "block-opening-brace-space-after": null,
+        "block-closing-brace-space-before": null,
+        "declaration-colon-newline-after": null,
+        "indentation": 4
+    }
+}