diff --git a/packages/gatsby/src/redux/__tests__/__snapshots__/pages.js.snap b/packages/gatsby/src/redux/__tests__/__snapshots__/pages.ts.snap
similarity index 100%
rename from packages/gatsby/src/redux/__tests__/__snapshots__/pages.js.snap
rename to packages/gatsby/src/redux/__tests__/__snapshots__/pages.ts.snap
diff --git a/packages/gatsby/src/redux/__tests__/__snapshots__/redirects.js.snap b/packages/gatsby/src/redux/__tests__/__snapshots__/redirects.ts.snap
similarity index 100%
rename from packages/gatsby/src/redux/__tests__/__snapshots__/redirects.js.snap
rename to packages/gatsby/src/redux/__tests__/__snapshots__/redirects.ts.snap
diff --git a/packages/gatsby/src/redux/__tests__/__snapshots__/status.js.snap b/packages/gatsby/src/redux/__tests__/__snapshots__/status.ts.snap
similarity index 100%
rename from packages/gatsby/src/redux/__tests__/__snapshots__/status.js.snap
rename to packages/gatsby/src/redux/__tests__/__snapshots__/status.ts.snap
diff --git a/packages/gatsby/src/redux/__tests__/pages.js b/packages/gatsby/src/redux/__tests__/pages.ts
similarity index 95%
rename from packages/gatsby/src/redux/__tests__/pages.js
rename to packages/gatsby/src/redux/__tests__/pages.ts
index b69f64b4a6153..e81ca9758236f 100644
--- a/packages/gatsby/src/redux/__tests__/pages.js
+++ b/packages/gatsby/src/redux/__tests__/pages.ts
@@ -1,16 +1,17 @@
+import { readFile } from "fs-extra"
+
 jest.mock(`fs-extra`, () => {
   return {
     readFile: jest.fn(() => `contents`),
   }
 })
-const glob = require(`glob`)
+import glob from "glob"
 
-const { pagesReducer: reducer } = require(`../reducers/pages`)
-const { actions } = require(`../actions`)
-const { readFile } = require(`fs-extra`)
+import { pagesReducer as reducer } from "../reducers/pages"
+import { actions } from "../actions"
 
 afterEach(() => {
-  readFile.mockClear()
+  ;(readFile as jest.Mock).mockClear()
 })
 
 Date.now = jest.fn(
diff --git a/packages/gatsby/src/redux/__tests__/redirects.js b/packages/gatsby/src/redux/__tests__/redirects.ts
similarity index 92%
rename from packages/gatsby/src/redux/__tests__/redirects.js
rename to packages/gatsby/src/redux/__tests__/redirects.ts
index 35c982055328d..26256c779c0ef 100644
--- a/packages/gatsby/src/redux/__tests__/redirects.js
+++ b/packages/gatsby/src/redux/__tests__/redirects.ts
@@ -1,12 +1,12 @@
-const { actions } = require(`../actions`)
-const { store } = require(`../index`)
+import { actions } from "../actions"
+import { store } from "../index"
 
 jest.mock(`../index`, () => {
   return {
     store: {
       getState: jest.fn(),
     },
-    dispath: () => {},
+    dispath: (): void => {},
     emitter: {
       on: jest.fn(),
     },
@@ -23,7 +23,9 @@ const protocolArr = [
 
 describe(`Add redirects`, () => {
   beforeEach(() => {
-    store.getState.mockReturnValue({ program: { pathPrefixs: false } })
+    ;(store.getState as jest.Mock).mockReturnValue({
+      program: { pathPrefixs: false },
+    })
   })
 
   it(`allows you to add redirects`, () => {
@@ -79,7 +81,7 @@ describe(`Add redirects`, () => {
 
 describe(`Add redirects with path prefixs`, () => {
   beforeEach(() => {
-    store.getState.mockReturnValue({
+    ;(store.getState as jest.Mock).mockReturnValue({
       program: {
         prefixPaths: true,
       },
diff --git a/packages/gatsby/src/redux/__tests__/status.js b/packages/gatsby/src/redux/__tests__/status.ts
similarity index 86%
rename from packages/gatsby/src/redux/__tests__/status.js
rename to packages/gatsby/src/redux/__tests__/status.ts
index 67fef98915510..d0c825eb28893 100644
--- a/packages/gatsby/src/redux/__tests__/status.js
+++ b/packages/gatsby/src/redux/__tests__/status.ts
@@ -1,6 +1,7 @@
 import { statusReducer } from "../reducers/status"
+import { IGatsbyState } from "../types"
 
-const { actions } = require(`../actions`)
+import { actions } from "../actions"
 
 Date.now = jest.fn(() => 1482363367071)
 
@@ -24,7 +25,7 @@ describe(`Status actions/reducer`, () => {
   })
 
   it(`throws an error if status isn't an object`, done => {
-    function runReducer() {
+    function runReducer(): IGatsbyState["status"] {
       return statusReducer(
         undefined,
         actions.setPluginStatus(`test job`, { name: `test-plugin` })
@@ -36,7 +37,7 @@ describe(`Status actions/reducer`, () => {
   })
 
   it(`throws an error if the plugin name isn't set`, done => {
-    function runReducer() {
+    function runReducer(): IGatsbyState["status"] {
       return statusReducer(
         undefined,
         actions.setPluginStatus({ blah: `test job` })
diff --git a/packages/gatsby/src/redux/types.ts b/packages/gatsby/src/redux/types.ts
index ae1c509bfc008..e862515b28718 100644
--- a/packages/gatsby/src/redux/types.ts
+++ b/packages/gatsby/src/redux/types.ts
@@ -81,6 +81,7 @@ export interface IGatsbyPlugin {
   id: Identifier
   name: string
   version: string
+  [key: string]: any
 }
 
 export interface IGatsbyPluginContext {