feat: expose previous data to resolveData via lastData param

measuredco · Apr 24, 2024 · dd7051e · dd7051e
1 parent 0a18bdb
commit dd7051e
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Showing 4 changed files with 7 additions and 1 deletion.
diff --git a/apps/docs/pages/docs/api-reference/configuration/component-config.mdx b/apps/docs/pages/docs/api-reference/configuration/component-config.mdx
@@ -274,6 +274,10 @@ const resolveData = async ({ props }, { changed }) => {
 };
 ```
 
+##### `params.lastData`
+
+The data object from the previous run of this function.
+
 #### Returns
 
 | Prop   | Example                                              | Type   |

diff --git a/packages/core/lib/resolve-component-data.ts b/packages/core/lib/resolve-component-data.ts
@@ -43,7 +43,7 @@ export const resolveComponentData = async (
     }
 
     const { props: resolvedProps, readOnly = {} } =
-      await configForItem.resolveData(item, { changed });
+      await configForItem.resolveData(item, { changed, lastData: oldItem });
 
     const { readOnly: existingReadOnly = {} } = item || {};
 

diff --git a/packages/core/lib/resolve-root-data.ts b/packages/core/lib/resolve-root-data.ts
@@ -17,6 +17,7 @@ export const resolveRootData = async (data: Data, config: Config) => {
 
     const resolvedRoot = await config.root?.resolveData(rootWithProps, {
       changed,
+      lastData: cache.lastChange?.original || {},
     });
 
     cache.lastChange = {

diff --git a/packages/core/types/Config.tsx b/packages/core/types/Config.tsx
@@ -180,6 +180,7 @@ export type ComponentConfig<
     data: DataShape,
     params: {
       changed: Partial<Record<keyof ComponentProps, boolean>>;
+      lastData: DataShape;
     }
   ) =>
     | Promise<{