Decaffeinate helper scripts (#4781)

* decaf script setup

* update gitignore

* fix conflicts, remove decaffeinate script hooks


Co-authored-by: Brian Mann <brian.mann86@gmail.com>

.eslintrc.decaffeinate.js

@@ -0,0 +1,13 @@
+const _ = require('lodash')
+const baseConfig = require('./.eslintrc.json')
+
+module.exports = _.defaultsDeep({}, baseConfig, {
+  rules: {
+    // auto-fix removing some common unnecessary returns
+    '@cypress/dev/no-return-before': 'error',
+    // make sure we use arrow callback
+    'prefer-arrow-callback': 'error',
+    // since our jscodemod scripts will format one-line-body functions as single line
+    'arrow-body-style': ['error', 'always'],
+  },
+})

.gitignore

@@ -64,3 +64,6 @@ scripts/support
 package-lock.json
 yarn.lock
 binary-url.json
+
+# Allows us to dynamically create eslint rules that override the default for Decaffeinate scripts
+.eslintrc.js

.vscode/tasks.json

@@ -6,7 +6,13 @@
     {
       "label": "decaffeinate-bulk file",
       "type": "shell",
-      "command": "npm run decaffeinate-bulk -- --file ${file} convert",
+      "command": "npm run decaffeinate-bulk -- convert --file ${file}",
+      "problemMatcher": []
+    },
+    {
+      "label": "decaffeinate-bulk multiple files",
+      "type": "shell",
+      "command": "npm run decaffeinate-bulk -- convert --file ${file} ${file}",
       "problemMatcher": []
     },
     {
@@ -14,16 +20,6 @@
       "type": "shell",
       "command": "npm run decaffeinate-bulk -- --dir ${fileDirname} convert",
       "problemMatcher": []
-    },
-    {
-      "label": "decaffeinate",
-      "type": "shell",
-      "command": "npm run decaffeinate -- ${file}"
-    },
-    {
-      "label": "jscodeshift",
-      "type": "shell",
-      "command": "npm run jscodeshift -- ${file}"
     }
   ]
 }

package.json

@@ -25,8 +25,9 @@
     "cypress:run": "node ./cli/bin/cypress run --dev",
     "cypress:run:debug": "node ./scripts/debug.js cypress:run",
     "cypress:verify": "node ./cli/bin/cypress verify --dev",
-    "decaffeinate": "decaffeinate --use-cs2 --loose",
+    "predecaffeinate-bulk": "shx cp .eslintrc.decaffeinate.js .eslintrc.js",
     "decaffeinate-bulk": "bulk-decaffeinate",
+    "postdecaffeinate-bulk": "shx rm .eslintrc.js",
     "dev": "node ./scripts/start.js",
     "dev-debug": "node ./scripts/debug.js dev",
     "docker": "./scripts/run-docker-local.sh",