chore(gatsby): migrate pageData reducer to TypeScript

packages/gatsby/src/redux/reducers/index.js

@@ -4,6 +4,7 @@ import { redirectsReducer } from "./redirects"
 import { staticQueryComponentsReducer } from "./static-query-components"
 import { statusReducer } from "./status"
 import { webpackReducer } from "./webpack"
+import { pageDataReducer } from "./page-data"
 import { themesReducer } from "./themes"
 import { webpackCompilationHashReducer } from "./webpack-compilation-hash"
 import { reducer as logReducer } from "gatsby-cli/lib/reporter/redux/reducer"
@@ -74,5 +75,5 @@ module.exports = {
   logs: logReducer,
   inferenceMetadata: require(`./inference-metadata`),
   pageDataStats: require(`./page-data-stats`),
-  pageData: require(`./page-data`),
+  pageData: pageDataReducer,
 }

packages/gatsby/src/redux/reducers/page-data.js → packages/gatsby/src/redux/reducers/page-data.ts

@@ -1,4 +1,9 @@
-module.exports = (state = new Map(), action) => {
+import { ActionsUnion, IGatsbyState } from "../types"
+
+export const pageDataReducer = (
+  state: IGatsbyState["pageData"] = new Map(),
+  action: ActionsUnion
+): IGatsbyState["pageData"] => {
   switch (action.type) {
     case `DELETE_CACHE`:
       return new Map()

packages/gatsby/src/redux/types.ts

@@ -206,7 +206,7 @@ export interface IGatsbyState {
     }
   }
   pageDataStats: Map<SystemPath, number>
-  pageData: any
+  pageData: Map<Identifier, string>
 }
 
 export interface ICachedReduxState {
@@ -243,6 +243,8 @@ export type ActionsUnion =
   | ISetWebpackCompilationHashAction
   | ISetWebpackConfigAction
   | IUpdatePluginsHashAction
+  | IRemovePageDataAction
+  | ISetPageDataAction
 
 export interface ICreatePageDependencyAction {
   type: `CREATE_COMPONENT_DEPENDENCY`
@@ -392,6 +394,21 @@ export interface IDeleteCacheAction {
   type: `DELETE_CACHE`
 }
 
+export interface IRemovePageDataAction {
+  type: `REMOVE_PAGE_DATA`
+  payload: {
+    id: Identifier
+  }
+}
+
+export interface ISetPageDataAction {
+  type: `SET_PAGE_DATA`
+  payload: {
+    id: Identifier
+    resultHash: string
+  }
+}
+
 export interface IReplaceStaticQueryAction {
   type: `REPLACE_STATIC_QUERY`
   payload: IGatsbyStaticQueryComponents