chore(gatsby): Convert redux/reducers/redirects to typescript (#22810)

* Convert redux/reducer/redirects to typescript

* Fix Tests

* Fix Test

* Fix

* address PR feedback

* fix issues in test

Co-authored-by: Blaine Kasten <blainekasten@gmail.com>

packages/gatsby/src/redux/reducers/__tests__/redirects.js → packages/gatsby/src/redux/reducers/__tests__/redirects.ts

@@ -1,9 +1,11 @@
+import { ICreateRedirectAction, IRedirect } from "../../types"
+
 let reducer
 
 describe(`redirects`, () => {
   beforeEach(() => {
     jest.isolateModules(() => {
-      reducer = require(`../redirects`)
+      reducer = require(`../redirects`).redirectsReducer
     })
   })
   it(`lets you redirect to an internal url`, () => {
@@ -15,7 +17,7 @@ describe(`redirects`, () => {
       },
     }
 
-    let state = reducer(undefined, action)
+    const state = reducer(undefined, action)
 
     expect(state).toEqual([
       {
@@ -34,7 +36,7 @@ describe(`redirects`, () => {
       },
     }
 
-    let state = reducer(undefined, action)
+    const state = reducer(undefined, action)
 
     expect(state).toEqual([
       {
@@ -73,7 +75,10 @@ describe(`redirects`, () => {
   })
 
   it(`prevents duplicate redirects`, () => {
-    function createRedirect(fromPath, toPath) {
+    function createRedirect(
+      fromPath: string,
+      toPath: string
+    ): ICreateRedirectAction {
       return {
         type: `CREATE_REDIRECT`,
         payload: { fromPath, toPath },
@@ -92,7 +97,7 @@ describe(`redirects`, () => {
   })
 
   it(`allows multiple redirects with same "fromPath" but different options`, () => {
-    function createRedirect(redirect) {
+    function createRedirect(redirect: IRedirect): ICreateRedirectAction {
       return {
         type: `CREATE_REDIRECT`,
         payload: redirect,

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

@@ -1,5 +1,6 @@
 const reduxNodes = require(`./nodes`)
 const lokiNodes = require(`../../db/loki/nodes`).reducer
+import { redirectsReducer } from "./redirects"
 
 const backend = process.env.GATSBY_DB_NODES || `redux`
 
@@ -59,7 +60,7 @@ module.exports = {
   jobsV2: require(`./jobsv2`),
   webpack: require(`./webpack`),
   webpackCompilationHash: require(`./webpack-compilation-hash`),
-  redirects: require(`./redirects`),
+  redirects: redirectsReducer,
   babelrc: require(`./babelrc`),
   schemaCustomization: require(`./schema-customization`),
   themes: require(`./themes`),

packages/gatsby/src/redux/reducers/redirects.ts

@@ -0,0 +1,46 @@
+import _ from "lodash"
+import { IGatsbyState, IRedirect, ICreateRedirectAction } from "../types"
+
+const redirects = new Map<string, IRedirect[]>()
+
+function exists(newRedirect: IRedirect): boolean {
+  const fromPathRedirects = redirects.get(newRedirect.fromPath)
+
+  if (!fromPathRedirects) return false
+
+  return fromPathRedirects.some(redirect => _.isEqual(redirect, newRedirect))
+}
+
+function add(redirect: IRedirect): void {
+  let samePathRedirects = redirects.get(redirect.fromPath)
+
+  if (!samePathRedirects) {
+    samePathRedirects = []
+    redirects.set(redirect.fromPath, samePathRedirects)
+  }
+
+  samePathRedirects.push(redirect)
+}
+
+export const redirectsReducer = (
+  state: IGatsbyState["redirects"] = [],
+  action: ICreateRedirectAction
+): IGatsbyState["redirects"] => {
+  switch (action.type) {
+    case `CREATE_REDIRECT`: {
+      const redirect = action.payload
+
+      // Add redirect only if it wasn't yet added to prevent duplicates
+      if (!exists(redirect)) {
+        add(redirect)
+
+        state.push(redirect)
+      }
+
+      return state
+    }
+
+    default:
+      return state
+  }
+}

packages/gatsby/src/redux/types.ts

@@ -6,6 +6,15 @@ type SystemPath = string
 type Identifier = string
 type StructuredLog = any // TODO this should come from structured log interface
 
+export interface IRedirect {
+  fromPath: string
+  toPath: string
+  isPermanent?: boolean
+  redirectInBrowser?: boolean
+  // Users can add anything to this createRedirect API
+  [key: string]: any
+}
+
 export enum ProgramStatus {
   BOOTSTRAP_FINISHED = `BOOTSTRAP_FINISHED`,
   BOOTSTRAP_QUERY_RUNNING_FINISHED = `BOOTSTRAP_QUERY_RUNNING_FINISHED`,
@@ -140,7 +149,7 @@ export interface IGatsbyState {
   }
   webpack: any // TODO This should be the output from ./utils/webpack.config.js
   webpackCompilationHash: string
-  redirects: any[] // TODO
+  redirects: IRedirect[]
   babelrc: {
     stages: {
       develop: any // TODO
@@ -303,3 +312,8 @@ export interface IRemoveStaleJobAction {
   traceId?: string
   payload: { contentDigest: string }
 }
+
+export interface ICreateRedirectAction {
+  type: `CREATE_REDIRECT`
+  payload: IRedirect
+}