Add json schema for savedStateConfig

compiler/crates/relay-compiler/src/config.rs

@@ -702,7 +702,7 @@ pub struct MultiProjectConfigFile {
     feature_flags: FeatureFlags,
 
     /// Watchman saved state config.
-    #[schemars(skip)] // TODO: Fix me
+    #[schemars(with = "Option<ScmAwareClockDataJsonSchemaDef>")]
     saved_state_config: Option<ScmAwareClockData>,
 
     /// Then name of the global __DEV__ variable to use in generated artifacts
@@ -1053,3 +1053,37 @@ pub trait OperationPersister {
         Ok(())
     }
 }
+
+// Below are structs that we use as part of our config that are defined in
+// crates that are not part of Relay. We are not able to implement `JsonSchema`
+// for these structs directly, so we define these shadow structs which match the
+// deserialization shape of the original. We can then use `#[serde(with =
+// "...")]` to have JsonSchema use these shadow structs to generate the schema.
+//
+// See [Schemars docs](https://graham.cool/schemars/examples/5-remote_derive/)
+// for more context on this pattern.
+
+/// Holds extended clock data that includes source control aware
+/// query metadata.
+/// <https://facebook.github.io/watchman/docs/scm-query.html>
+#[derive(JsonSchema)]
+#[serde(remote = "ScmAwareClockData")]
+pub struct ScmAwareClockDataJsonSchemaDef {
+    pub mergebase: Option<String>,
+    #[serde(rename = "mergebase-with")]
+    pub mergebase_with: Option<String>,
+    #[serde(rename = "saved-state")]
+    pub saved_state: Option<SavedStateClockDataJsonSchemaDef>,
+}
+
+/// Holds extended clock data that includes source control aware
+/// query metadata.
+/// <https://facebook.github.io/watchman/docs/scm-query.html>
+#[derive(JsonSchema)]
+#[serde(remote = "SavedStateClockData")]
+pub struct SavedStateClockDataJsonSchemaDef {
+    pub storage: Option<String>,
+    #[serde(rename = "commit-id")]
+    pub commit: Option<String>,
+    pub config: Option<Value>,
+}

compiler/relay-compiler-config-schema.json

@@ -4471,6 +4471,49 @@
             "null"
           ]
         },
+        "savedStateConfig": {
+          "description": "Watchman saved state config.",
+          "type": [
+            "object",
+            "null"
+          ],
+          "properties": {
+            "mergebase": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "mergebase-with": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "saved-state": {
+              "description": "Holds extended clock data that includes source control aware query metadata. <https://facebook.github.io/watchman/docs/scm-query.html>",
+              "type": [
+                "object",
+                "null"
+              ],
+              "properties": {
+                "commit-id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "config": true,
+                "storage": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              }
+            }
+          }
+        },
         "sources": {
           "description": "A mapping from directory paths (relative to the root) to a source set. If a path is a subdirectory of another path, the more specific path wins.",
           "type": "object",