feat(ui-codemods): read consumer config for prettier if it exists when applying codemods

TEST PLAN:
- Codemods should work as before, but the code output should be formatted according to the consumer
prettier config

Change-Id: I88a500ed9d88ca3e4f6d4ad8714bc9cff681bdad
Reviewed-on: https://gerrit.instructure.com/c/instructure-ui/+/237054
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Pam Hiett <phiett@instructure.com>
Product-Review: Pam Hiett <phiett@instructure.com>
QA-Review: Steve Jensen <sejensen@instructure.com>
Visual-Regression-Test: Steve Jensen <sejensen@instructure.com>

Author: serikjensen

packages/ui-codemods/__testfixtures__/.prettierrc

@@ -0,0 +1,5 @@
+{
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "none"
+}

packages/ui-codemods/lib/updateImports.js

@@ -48,11 +48,12 @@ module.exports = function (file, api, options) {
   }
 
   const root = j(file.source)
+
   let hasModifications = false
 
   hasModifications = replaceDeprecatedImports(j, root, config, api) || hasModifications
 
   return hasModifications
-    ? formatSource(root.toSource())
+    ? formatSource(root.toSource(), file.path)
     : null
 }

packages/ui-codemods/lib/updatePropNames.js

@@ -44,6 +44,6 @@ module.exports = function (file, api, options) {
   hasModifications = replaceDeprecatedProps(j, root, config) || hasModifications
 
   return hasModifications
-    ? formatSource(root.toSource())
+    ? formatSource(root.toSource(), file.path)
     : null
 }

packages/ui-codemods/lib/utils/formatSource.js

@@ -24,8 +24,24 @@
 
 const prettier = require('prettier')
 
-module.exports = function formatSource (source) {
-  return prettier.format(source, {
+module.exports = function formatSource (source, sourcePath) {
+  let options = null
+
+  try {
+    options = prettier.resolveConfig.sync(sourcePath)
+
+    if (options) {
+      // Set the parser argument if the consumer did not set one to avoid a console warning
+      options = {
+        ...options,
+        parser: options.parser || 'babel'
+      }
+    }
+  } catch (err) {
+    // Will revert to the deafult prettier options if a config cannot be parsed
+  }
+
+  return prettier.format(source, options || {
     parser: 'babel',
     semi: false,
     singleQuote: true,