Fix pluginSearchDirs schema (#12474)

* Fix `pluginSearchDirs` schema

* `anyOf` -> `oneOf`

* Fix test

scripts/utils/generate-schema.js

@@ -84,6 +84,19 @@ function optionToSchema(option) {
   }
   if (option.array) {
     schema = wrapWithArraySchema(schema);
+
+    // #10274
+    if (option.name === "pluginSearchDirs") {
+      schema = {
+        oneOf: [
+          schema,
+          {
+            enum: [false],
+            description: "Disable plugin autoloading.",
+          },
+        ],
+      };
+    }
   }
   return {
     description: option.description,

tests/integration/__tests__/__snapshots__/schema.js.snap

@@ -281,10 +281,20 @@ This option cannot be used with --range-start and --range-end.",
           "description": "Custom directory that contains prettier plugins in node_modules subdirectory.
 Overrides default behavior when plugins are searched relatively to the location of Prettier.
 Multiple values are accepted.",
-          "items": Object {
-            "type": "string",
-          },
-          "type": "array",
+          "oneOf": Array [
+            Object {
+              "items": Object {
+                "type": "string",
+              },
+              "type": "array",
+            },
+            Object {
+              "description": "Disable plugin autoloading.",
+              "enum": Array [
+                false,
+              ],
+            },
+          ],
         },
         "plugins": Object {
           "default": Array [],