feat: gatsby source medusa (#924)

packages/gatsby-source-medusa/src/make-source-from-operation.ts

@@ -0,0 +1,25 @@
+import { SourceNodesArgs } from "gatsby"
+import { processNode } from "./process-node"
+
+export function makeSourceFromOperation(gatsbyApi: SourceNodesArgs) {
+  return async function sourceFromOperation(
+    op: IMedusaOperation
+  ): Promise<void> {
+    const { reporter, actions } = gatsbyApi
+
+    reporter.info(`Initiating operation query ${op.name}`)
+    const nodes = await op.execute()
+
+    nodes.map((rawNode) => {
+      const nodeArr = processNode(
+        rawNode,
+        op.name,
+        gatsbyApi.createContentDigest
+      )
+
+      nodeArr.forEach((node) => {
+        actions.createNode(node)
+      })
+    })
+  }
+}