feat: make coffee plugin optional

Author: aminya

package.json

@@ -27,18 +27,15 @@
     "@babel/plugin-syntax-jsx": "^7.16.7",
     "@typescript-eslint/eslint-plugin": "^5.10.1",
     "@typescript-eslint/parser": "^5.10.1",
-    "coffeescript": "^1",
     "eslint": "^7",
     "eslint-config-prettier": "^8.3.0",
-    "eslint-plugin-coffee": "^0.1.15",
     "eslint-plugin-html": "^6.2.0",
     "eslint-plugin-import": "^2.25.4",
     "eslint-plugin-json": "^3.1.0",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-only-warn": "npm:@aminya/eslint-plugin-only-warn@^1.2.2",
     "eslint-plugin-optimize-regex": "^1.2.1",
     "eslint-plugin-react": "^7.28.0",
-    "eslint-plugin-react-hooks": "^4.3.0",
     "eslint-plugin-yaml": "^0.5.0",
     "prettier": "^2",
     "read-pkg-up": "^7",
@@ -55,6 +52,11 @@
   "peerDependencies": {
     "eslint": "^7"
   },
+  "optionalDependencies": {
+    "coffeescript": "^1",
+    "eslint-plugin-coffee": "^0.1.15",
+    "eslint-plugin-react-hooks": "^4.3.0"
+  },
   "keywords": [
     "eslint",
     "config",

pnpm-lock.yaml

@@ -7,6 +7,20 @@ const { yamlConfig } = require("./yaml")
 const { htmlConfig } = require("./html")
 const { pluginImportSettings } = require("./plugin-import-rules")
 
+const overrides = [tsConfig, jsonConfig, yamlConfig, htmlConfig]
+
+// add coffee if installed
+if (coffeeConfig !== {}) {
+  try {
+    const found = require.resolve("eslint-plugin-coffee")
+    if (found) {
+      overrides.push(coffeeConfig, csonConfig)
+    }
+  } catch (_err) {
+    // optional plugin
+  }
+}
+
 module.exports = {
   root: true,
   env: {
@@ -21,7 +35,7 @@ module.exports = {
     measure: "readonly",
   },
   ...jsConfig,
-  overrides: [tsConfig, coffeeConfig, jsonConfig, csonConfig, yamlConfig, htmlConfig],
+  overrides,
   settings: {
     ...pluginImportSettings,
   },