Add ESLint config

.eslintrc.json

@@ -0,0 +1,29 @@
+{
+  "parserOptions": {
+    "ecmaVersion": 5
+  },
+  "extends": "eslint:recommended",
+  "env": {
+    "commonjs": true,
+    "browser": true
+  },
+  "rules": {
+    "strict": [2, "global"],
+    "block-scoped-var": 2,
+    "consistent-return": 2,
+    "eqeqeq": [2, "smart"],
+    "guard-for-in": 2,
+    "no-caller": 2,
+    "no-extend-native": 2,
+    "no-loop-func": 2,
+    "no-new": 2,
+    "no-param-reassign": 2,
+    "no-return-assign": 2,
+    "no-unused-expressions": 2,
+    "no-use-before-define": 2,
+    "radix": [2, "always"],
+    "indent": [2, 2],
+    "quotes": [2, "double"],
+    "semi": [2, "always"]
+  }
+}

.gitignore

@@ -4,6 +4,7 @@ bower_components/
 package-lock.json
 
 /.*
+!/.eslintrc.json
 !/.github
 !/.gitignore
 

CHANGELOG.md

@@ -12,6 +12,7 @@ New features:
 Bugfixes:
 
 Other improvements:
+- Added ESLint config and fixed the resulting linter issues (#82)
 
 ## [v5.0.0](https://github.com/purescript-web/purescript-canvas/releases/tag/v5.0.0) - 2021-02-26
 

package.json

@@ -2,9 +2,10 @@
   "private": true,
   "scripts": {
     "clean": "rimraf output && rimraf .pulp-cache",
-    "build": "pulp build -- --censor-lib --strict"
+    "build": "eslint src && pulp build -- --censor-lib --strict"
   },
   "devDependencies": {
+    "eslint": "^7.32.0",
     "pulp": "^15.0.0",
     "purescript-psa": "^0.8.0",
     "rimraf": "^3.0.2"