Narrow Action type to only defined reducers.

src/@types/ActionType.ts

@@ -0,0 +1,5 @@
+import * as reducers from '../actions/index'
+
+type ActionType = keyof typeof reducers
+
+export default ActionType

src/@types/Patch.ts

@@ -1,10 +1,11 @@
 import { GetOperation } from 'fast-json-patch'
+import ActionType from './ActionType'
 
 // Extend fast-json-patch Operation type to include actions list
 // See fast-json-patch types: https://github.com/Starcounter-Jack/JSON-Patch/blob/89a09e94e0e6500115789e33586a75c8dd1aea13/module/core.d.ts
 // TODO: This should allow any Operation, not just GetOperation. But how to extend?
 interface ExtendedOperation<T = any> extends GetOperation<T> {
-  actions: string[]
+  actions: ActionType[]
 }
 
 type Patch = ExtendedOperation[]

src/actions/app.ts

@@ -1,4 +1,5 @@
 import { Action } from 'redux'
+import ActionType from '../@types/ActionType'
 import Index from '../@types/IndexType'
 import State from '../@types/State'
 import initialState from '../util/initialState'
@@ -7,7 +8,7 @@ import * as reducers from './index'
 /**
  * The main app reducer. Uses action.type to select the reducer with the same name. Otherwise throw an error with unknownAction.
  */
-const appReducer = (state: State = initialState(), action: Action<string>): State =>
+const appReducer = (state: State = initialState(), action: Action<ActionType>): State =>
   ((reducers as Index<any>)[action.type] || reducers.unknownAction)(state, action)
 
 export default appReducer

src/commands/splitSentences.tsx

@@ -1,8 +1,5 @@
 import _ from 'lodash'
-import { Dispatch } from 'react'
-import { Action } from 'redux'
 import Command from '../@types/Command'
-import Thunk from '../@types/Thunk'
 import { alertActionCreator as alert } from '../actions/alert'
 import { splitSentencesActionCreator as splitSentences } from '../actions/splitSentences'
 import SplitSentencesIcon from '../components/icons/SplitSentencesIcon'
@@ -20,7 +17,7 @@ const splitSentencesShortcut: Command = {
   canExecute: state => {
     return !!state.cursor || hasMulticursor(state)
   },
-  exec: (dispatch: Dispatch<Action | Thunk>, getState) => {
+  exec: (dispatch, getState) => {
     const state = getState()
     const { cursor } = state
     const value = cursor ? headValue(state, cursor) : undefined

src/components/LayoutTree.tsx

@@ -4,6 +4,7 @@ import { useSelector } from 'react-redux'
 import { TransitionGroup } from 'react-transition-group'
 import { CSSTransitionProps } from 'react-transition-group/CSSTransition'
 import { css, cx } from '../../styled-system/css'
+import ActionType from '../@types/ActionType'
 import Autofocus from '../@types/Autofocus'
 import Index from '../@types/IndexType'
 import LazyEnv from '../@types/LazyEnv'
@@ -435,7 +436,12 @@ const TreeNode = ({
 
   // true if the last action is any of archive/delete/collapse
   const isLastActionDelete = useSelector(state => {
-    const deleteActions = ['archiveThought', 'collapseContext', 'deleteThought', 'deleteThoughtWithCursor']
+    const deleteActions: ActionType[] = [
+      'archiveThought',
+      'collapseContext',
+      'deleteThought',
+      'deleteThoughtWithCursor',
+    ]
     const lastPatches = state.undoPatches[state.undoPatches.length - 1]
     return lastPatches?.some(patch => deleteActions.includes(patch.actions[0]))
   })

src/redux-enhancers/undoRedoEnhancer.ts

@@ -2,20 +2,20 @@ import { Operation, applyPatch, compare } from 'fast-json-patch'
 import { produce } from 'immer'
 import _ from 'lodash'
 import { Action, Store, StoreEnhancer, StoreEnhancerStoreCreator } from 'redux'
+import ActionType from '../@types/ActionType'
 import Index from '../@types/IndexType'
 import Lexeme from '../@types/Lexeme'
 import Patch from '../@types/Patch'
 import State from '../@types/State'
 import ThoughtId from '../@types/ThoughtId'
-import * as reducers from '../actions'
 import updateThoughts from '../actions/updateThoughts'
 import getThoughtById from '../selectors/getThoughtById'
 import headValue from '../util/headValue'
 import reducerFlow from '../util/reducerFlow'
 
 // a map of action types to boolean
 type ActionFlags = {
-  [key in keyof typeof reducers]: boolean
+  [key in ActionType]: boolean
 }
 
 // Actions representing any cursor movements.