Progress on incoming event handling

.eslintrc.cjs

@@ -0,0 +1,46 @@
+module.exports = {
+    env: {
+        commonjs: true,
+        es6: true,
+        browser: true,
+    },
+    extends: ['eslint:recommended', 'plugin:prettier/recommended'],
+    globals: {
+        DISCORD_APP_ID: true,
+        DISCORD_PUBLIC_KEY: true,
+        DISCORD_BOT_TOKEN: true,
+    },
+    parser: '@typescript-eslint/parser',
+    parserOptions: {
+        ecmaVersion: 6,
+        sourceType: 'module',
+    },
+    plugins: ['@typescript-eslint'],
+    rules: {
+        'prettier/prettier': 'warn',
+        'no-cond-assign': [2, 'except-parens'],
+        'no-unused-vars': 0,
+        '@typescript-eslint/no-unused-vars': 1,
+        'no-empty': [
+            'error',
+            {
+                allowEmptyCatch: true,
+            },
+        ],
+        'prefer-const': [
+            'warn',
+            {
+                destructuring: 'all',
+            },
+        ],
+        'spaced-comment': 'warn',
+    },
+    overrides: [
+        {
+            files: ['slash-up.config.js', 'webpack.config.js'],
+            env: {
+                node: true,
+            },
+        },
+    ],
+}

.eslintrc.js

@@ -1,46 +0,0 @@
-module.exports = {
-  env: {
-    commonjs: true,
-    es6: true,
-    browser: true
-  },
-  extends: ['eslint:recommended', 'plugin:prettier/recommended'],
-  globals: {
-    DISCORD_APP_ID: true,
-    DISCORD_PUBLIC_KEY: true,
-    DISCORD_BOT_TOKEN: true
-  },
-  parser: '@typescript-eslint/parser',
-  parserOptions: {
-    ecmaVersion: 6,
-    sourceType: 'module'
-  },
-  plugins: ['@typescript-eslint'],
-  rules: {
-    'prettier/prettier': 'warn',
-    'no-cond-assign': [2, 'except-parens'],
-    'no-unused-vars': 0,
-    '@typescript-eslint/no-unused-vars': 1,
-    'no-empty': [
-      'error',
-      {
-        allowEmptyCatch: true
-      }
-    ],
-    'prefer-const': [
-      'warn',
-      {
-        destructuring: 'all'
-      }
-    ],
-    'spaced-comment': 'warn'
-  },
-  overrides: [
-    {
-      files: ['slash-up.config.js', 'webpack.config.js'],
-      env: {
-        node: true
-      }
-    }
-  ]
-};

.idea/jsLibraryMappings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <includedPredefinedLibrary name="Node.js Core" />
+  </component>
+</project>

slash-up.config.js

@@ -2,18 +2,18 @@
 // Make sure to fill in "token" and "applicationId" before using.
 // You can also use environment variables from the ".env" file if any.
 
-module.exports = {
+export default {
-  // The Token of the Discord bot
+    // The Token of the Discord bot
-  token: process.env.DISCORD_BOT_TOKEN,
+    token: process.env.DISCORD_BOT_TOKEN,
-  // The Application ID of the Discord bot
+    // The Application ID of the Discord bot
-  applicationId: process.env.DISCORD_APP_ID,
+    applicationId: process.env.DISCORD_APP_ID,
-  // This is where the path to command files are, .ts files are supported!
+    // This is where the path to command files are, .ts files are supported!
-  commandPath: './src/commands',
+    commandPath: './src/commands',
-  // You can use different environments with --env (-e)
+    // You can use different environments with --env (-e)
-  env: {
+    env: {
-    development: {
+        development: {
-      // The "globalToGuild" option makes global commands sync to the specified guild instead.
+            // The "globalToGuild" option makes global commands sync to the specified guild instead.
-      globalToGuild: process.env.DEVELOPMENT_GUILD_ID
+            globalToGuild: process.env.DEVELOPMENT_GUILD_ID,
-    }
+        },
-  }
+    },
-};
+}

src/game/dieState.spec.ts

@@ -1,5 +1,5 @@
 import { describe, expect, test } from '@jest/globals'
-import { DieState, isHeldState, isSelectedState, setDeselected, setSelected, toggleSelected } from './gameData'
+import { DieState, isHeldState, isSelectedState, setDeselected, setSelected, toggleSelected } from './dieState'
 
 describe('isHeldState', () => {
     test.each<[DieState, boolean]>([

src/game/dieState.ts

@@ -0,0 +1,130 @@
+export enum DieFace {
+    FAIL = 'F',
+    STOP = 'S',
+    WILD = '*',
+    BONUS = 'B',
+    USELESS = 'X',
+    SCORE_0 = '0',
+    SCORE_1 = '1',
+    SCORE_2 = '2',
+    SCORE_3 = '3',
+    SCORE_4 = '4',
+    SCORE_5 = '5',
+    SCORE_6 = '6',
+    SCORE_7 = '7',
+    SCORE_8 = '8',
+    SCORE_9 = '9',
+    SCORE_10 = '10',
+}
+
+export type SpecialDie = DieFace.FAIL | DieFace.STOP | DieFace.WILD | DieFace.BONUS | DieFace.USELESS
+export type ScoringDie =
+    | DieFace.SCORE_0
+    | DieFace.SCORE_1
+    | DieFace.SCORE_2
+    | DieFace.SCORE_3
+    | DieFace.SCORE_4
+    | DieFace.SCORE_5
+    | DieFace.SCORE_6
+    | DieFace.SCORE_7
+    | DieFace.SCORE_8
+    | DieFace.SCORE_9
+    | DieFace.SCORE_10
+
+type DieFaceCount = {
+    [v in DieFace]?: number
+}
+
+export enum DieState {
+    ROLLED = 'rolled',
+    SELECTED = 'selected',
+    HELD = 'held',
+    HELD_SELECTED = 'held_selected',
+    SCORED = 'scored',
+}
+
+export function isHeldState(d: DieState): d is DieState.HELD | DieState.HELD_SELECTED {
+    return d === DieState.HELD || d === DieState.HELD_SELECTED
+}
+
+export function isSelectedState(d: DieState): d is DieState.SELECTED | DieState.HELD_SELECTED {
+    return d === DieState.SELECTED || d === DieState.HELD_SELECTED
+}
+
+export function setSelected(d: DieState): DieState.SELECTED | DieState.HELD_SELECTED | DieState.SCORED {
+    switch (d) {
+        case DieState.ROLLED:
+            return DieState.SELECTED
+        case DieState.HELD:
+            return DieState.HELD_SELECTED
+        case DieState.SELECTED:
+        case DieState.HELD_SELECTED:
+        case DieState.SCORED:
+            return d
+    }
+}
+
+export function setDeselected(d: DieState): DieState.ROLLED | DieState.HELD | DieState.SCORED {
+    switch (d) {
+        case DieState.SELECTED:
+            return DieState.ROLLED
+        case DieState.HELD_SELECTED:
+            return DieState.HELD
+        case DieState.ROLLED:
+        case DieState.HELD:
+        case DieState.SCORED:
+            return d
+    }
+}
+
+export function toggleSelected(d: DieState): DieState {
+    switch (d) {
+        case DieState.ROLLED:
+            return DieState.SELECTED
+        case DieState.SELECTED:
+            return DieState.ROLLED
+        case DieState.HELD:
+            return DieState.HELD_SELECTED
+        case DieState.HELD_SELECTED:
+            return DieState.HELD
+        case DieState.SCORED:
+            return DieState.SCORED
+    }
+}
+
+export interface DieResult {
+    readonly type: DieType
+    readonly face: DieFace
+    readonly state: DieState
+}
+
+export interface DieType {
+    // The name of this die type
+    readonly name: string
+    // The faces of this die type; faces may be repeated to increase their odds
+    readonly faces: readonly DieFace[]
+}
+
+export interface DiceCombo {
+    // The name of this combo, for the UI
+    readonly name: string
+    // How many points this combo is worth
+    readonly points: number
+    // Which dice are needed to satisfy this combo
+    readonly dice: readonly ScoringDie[]
+    // How many dice can be replaced for the combo
+    readonly wildMaxDice?: number
+}
+
+export interface DiceComboResult {
+    // combo used
+    readonly combo: DiceCombo
+    // total number of points
+    readonly points: number
+    // number of dice used
+    readonly usesDice: DieFaceCount
+    // number of wild dice used
+    readonly wildDice: number
+    // number of bonus dice used
+    readonly bonusDice: number
+}

src/game/gameEvent.ts

@@ -1,30 +1,40 @@
-import { DieResult, GameData } from './gameData'
+import { DiceCombo, DieResult } from './dieState'
 
 export enum IncomingEventType {
     // Chooses the action to be performed for this round but does not lock it in until the player rolls.
+    // Valid during GameState.ROUND_START
     SelectAction = 'select_action',
     // Dice buttons toggle the selection of that die
+    // Valid during GameState.TURN_ROLLED
     ToggleSelectDie = 'toggle_select_die',
     // Button 1 is Select All/Deselect All
     // Select All appears if no dice are selected
     // Deselect All displays if at least one die is selected
+    // Both valid during GameState.TURN_ROLLED
     SelectAllDice = 'select_all_dice',
     DeselectAllDice = 'deselect_all_dice',
     // Button 2 is Hold/Release selected dice
     // If only held dice are selected, Release appears
     // For selections with at least one unheld die, Hold appears
+    // Both valid during GameState.TURN_ROLLED
     HoldSelectedDice = 'hold_selected_dice',
     ReleaseSelectedDice = 'release_selected_dice',
     // Button 3 is End Turn/Score Selected Dice
-    // End Turn appears if at least one Stop die is selected, but is only enabled if sufficient Stop dice are selected
+    // End Turn appears by default, but is only enabled if sufficient Stop dice are in the current roll or if the turn
-    // and no non-Stop dice are selected
+    // has been failed
-    // Score Selected Dice appears otherwise, but is only enabled if at least one scoreable die is selected and no
+    // Score Selected Dice appears when any dice are selected, but is only enabled if at least one scoreable die is
-    // non-scoreable dice are selected
+    // selected and no non-scoreable dice are selected
+    // Both appear during GameState.TURN_ROLLED
+    // End Turn also appears and must be pressed to move to the next round (or end the game) in GameState.TURN_FAILED
     EndTurn = 'end_turn',
     ScoreSelectedDice = 'score_selected_dice',
     // Button 4 is Roll Dice
-    // It's always visible, but is disabled if there are no unheld dice
+    // It's always visible, but is disabled if there are no unheld dice or if the action has not been chosen
+    // Valid during GameState.ROUND_START, GameState.TURN_START, and GameState.TURN_ROLLED
     RollDice = 'roll_dice',
+    // Abort ends the game without a victor
+    // Valid during any state except GameState.ABORTED or GameState.VICTORY
+    Abort = 'abort',
 }
 
 export interface IncomingBaseEvent {
@@ -46,6 +56,7 @@ export interface IncomingSimpleEvent extends IncomingBaseEvent {
         | IncomingEventType.EndTurn
         | IncomingEventType.DeselectAllDice
         | IncomingEventType.RollDice
+        | IncomingEventType.Abort
 }
 
 export type IncomingEvent = IncomingIndexedEvent | IncomingSimpleEvent
@@ -74,6 +85,7 @@ export enum OutgoingEventType {
 
     ScoreDice = 'score_dice',
     GainFailures = 'gain_failures',
+    SafeEndTurn = 'safe_end_turn',
 
     LoseRound = 'lose_round',
     LoseGame = 'lose_game',
@@ -83,11 +95,6 @@ export enum OutgoingEventType {
     StartRound = 'new_round',
 }
 
-export enum EventTarget {
-    Top = 'top',
-    Bottom = 'bottom',
-}
-
 export enum TextSender {
     Top = 'top',
     Bottom = 'bottom',
@@ -114,6 +121,7 @@ export interface OutgoingBaseTargetedEvent extends OutgoingBaseEvent {
         | OutgoingEventType.LoseGame
         | OutgoingEventType.ScoreDice
         | OutgoingEventType.GainFailures
+        | OutgoingEventType.SafeEndTurn
         | OutgoingEventType.StartRoll
         | OutgoingEventType.StartTurn
         | OutgoingEventType.StartRound
@@ -121,7 +129,11 @@ export interface OutgoingBaseTargetedEvent extends OutgoingBaseEvent {
 }
 
 export interface OutgoingSimpleTargetedEvent extends OutgoingBaseTargetedEvent {
-    readonly type: OutgoingEventType.LoseGame | OutgoingEventType.StartTurn | OutgoingEventType.StartRound
+    readonly type:
+        | OutgoingEventType.LoseGame
+        | OutgoingEventType.StartTurn
+        | OutgoingEventType.StartRound
+        | OutgoingEventType.SafeEndTurn
 }
 
 export interface OutgoingDamageEvent extends OutgoingBaseTargetedEvent {
@@ -137,12 +149,13 @@ export interface OutgoingDamageEvent extends OutgoingBaseTargetedEvent {
 
 export interface OutgoingStartRollEvent extends OutgoingBaseTargetedEvent {
     readonly type: OutgoingEventType.StartRoll
-    readonly newDice: DieResult[]
+    readonly newDice: readonly DieResult[]
 }
 
 export interface OutgoingScoreDiceEvent extends OutgoingBaseTargetedEvent {
     readonly type: OutgoingEventType.ScoreDice
-    readonly scoredDice: DieResult[]
+    readonly scoredCombo: DiceCombo
+    readonly scoredDice: readonly DieResult[]
     readonly scoreDelta: number
 }
 
@@ -153,16 +166,16 @@ export type OutgoingEvent =
     | OutgoingStartRollEvent
     | OutgoingScoreDiceEvent
 
-export interface BaseEventResult {
+export interface BaseEventResult<T> {
-    readonly newState: GameData
+    readonly newState: T
 }
 
-export interface SuccessResult extends BaseEventResult {
+export interface SuccessResult<T> extends BaseEventResult<T> {
-    readonly events: OutgoingEvent[]
+    readonly events: readonly OutgoingEvent[]
 }
 
-export interface FailedResult extends BaseEventResult {
+export interface FailedResult<T> extends BaseEventResult<T> {
     readonly error: GameError
 }
 
-export type EventResult = SuccessResult | FailedResult
+export type EventResult<T> = SuccessResult<T> | FailedResult<T>

src/game/gameState.ts

@@ -1,88 +1,5 @@
 import { RenderableText } from '../util/renderableText'
-
+import { DiceCombo, DieResult, DieType } from './dieState'
-export enum DieFace {
-    FAIL = 'F',
-    STOP = 'S',
-    SCORE_0 = '0',
-    SCORE_1 = '1',
-    SCORE_2 = '2',
-    SCORE_3 = '3',
-    SCORE_4 = '4',
-    SCORE_5 = '5',
-    WILD = '*',
-    HEART = '<3',
-    QUESTION = '?',
-}
-
-export enum DieState {
-    ROLLED = 'rolled',
-    SELECTED = 'selected',
-    HELD = 'held',
-    HELD_SELECTED = 'held_selected',
-    SCORED = 'scored',
-}
-
-export function isHeldState(d: DieState): d is DieState.HELD | DieState.HELD_SELECTED {
-    return d === DieState.HELD || d === DieState.HELD_SELECTED
-}
-
-export function isSelectedState(d: DieState): d is DieState.SELECTED | DieState.HELD_SELECTED {
-    return d === DieState.SELECTED || d === DieState.HELD_SELECTED
-}
-
-export function setSelected(d: DieState): DieState.SELECTED | DieState.HELD_SELECTED | DieState.SCORED {
-    switch (d) {
-        case DieState.ROLLED:
-            return DieState.SELECTED
-        case DieState.HELD:
-            return DieState.HELD_SELECTED
-        case DieState.SELECTED:
-        case DieState.HELD_SELECTED:
-        case DieState.SCORED:
-            return d
-    }
-}
-
-export function setDeselected(d: DieState): DieState.ROLLED | DieState.HELD | DieState.SCORED {
-    switch (d) {
-        case DieState.SELECTED:
-            return DieState.ROLLED
-        case DieState.HELD_SELECTED:
-            return DieState.HELD
-        case DieState.ROLLED:
-        case DieState.HELD:
-        case DieState.SCORED:
-            return d
-    }
-}
-
-export function toggleSelected(d: DieState): DieState {
-    switch (d) {
-        case DieState.ROLLED:
-            return DieState.SELECTED
-        case DieState.SELECTED:
-            return DieState.ROLLED
-        case DieState.HELD:
-            return DieState.HELD_SELECTED
-        case DieState.HELD_SELECTED:
-            return DieState.HELD
-        case DieState.SCORED:
-            return DieState.SCORED
-    }
-}
-
-export interface DieResult {
-    readonly type: DieType
-    readonly face: DieFace
-    readonly state: DieState
-}
-
-export interface DieType {
-    // The name of this die type
-    readonly name: string
-    // The faces of this die type; faces may be repeated to increase their odds
-    readonly faces: readonly DieFace[]
-}
 
 export interface AIWeights {
     // How much this AI likes to choose actions that increase the damage bonus
@@ -165,11 +82,13 @@ export interface Difficulty {
     readonly shortDescription?: string
     // Description of the difficulty when selected
     readonly description?: string
+    // The player who should start in this difficulty; defaults to random
+    readonly startingPlayer?: PlayerSide | null
 
-    // Starting values for the top
+    // Starting values for each character
-    readonly topStats: PlayerStartingState
+    readonly stats: {
-    // Starting values for the bottom
+        readonly [x in PlayerSide]: PlayerStartingState
-    readonly bottomStats: PlayerStartingState
+    }
 }
 
 export interface PlayerText {
@@ -198,6 +117,8 @@ export interface GameTheme {
     readonly shortDescription: string
     readonly description: string
 
+    readonly diceCombos: readonly DiceCombo[]
+
     readonly actions: readonly GameAction[]
 
     readonly difficulties: readonly Difficulty[]
@@ -205,8 +126,10 @@ export interface GameTheme {
     readonly commonText?: { readonly [key: string]: RenderableText | undefined }
 
     readonly narratorName: string
-    readonly topText: PlayerText
+
-    readonly bottomText: PlayerText
+    readonly text: {
+        readonly [x in PlayerSide]: PlayerText
+    }
 }
 
 export interface TriggeredText {
@@ -257,10 +180,10 @@ export interface ActionText {
 }
 
 export interface GameAction {
-    // The text from the top's perspective, and for the top's actions
+    // The text from each player's perspective.
-    readonly topText: ActionText
+    readonly text: {
-    // The text from the bottom's perspective, and for the bottom's actions
+        readonly [x in PlayerSide]: ActionText
-    readonly bottomText: ActionText
+    }
 
     // The dice that are rolled for this action
     readonly dice: readonly DieType[]
@@ -276,6 +199,11 @@ export interface GameAction {
     readonly canFinishBottom: boolean
 }
 
+export enum PlayerSide {
+    TOP = 'top',
+    BOTTOM = 'bottom',
+}
+
 export interface PlayerState {
     // This player's name
     readonly name: string
@@ -301,49 +229,45 @@ export interface PlayerState {
     readonly timesRecovered: number
 }
 
-export enum GameState {
+export enum GamePhase {
-    ONGOING = 'ongoing',
+    ROUND_START = 'round_start',
+    TURN_START = 'turn_start',
+    TURN_ROLLED = 'turn_rolled',
+    TURN_FAILED = 'turn_failed',
     ABORTED = 'aborted',
-    TOP_WINS = 'top_wins',
+    VICTORY = 'victory',
-    BOTTOM_WINS = 'bottom_wins',
 }
 
-export interface GameData {
+export interface GameState {
-    // The version of the serialization format this data was saved with.
-    readonly version: number
-    // Whether the game is still ongoing, or if not, who won (if anyone).
-    readonly gameState: GameState
-
-    // The state of the top player
-    readonly top: PlayerState
-    // The state of the bottom player
-    readonly bottom: PlayerState
-
     // The theme that defines this game for the players.
     readonly theme: GameTheme
     // The difficulty selected for this game.
     readonly difficulty: Difficulty
 
-    // If true, the top chose/is choosing the action this round.
+    // The current phase of the game.
-    readonly isTopRound: boolean
+    readonly gamePhase: GamePhase
-    // The action chosen for this round, or null if the current player has not chosen an action yet.
+    // The owner of the current phase, or null if the phase is Aborted
-    // The action is locked in if lastRoll is not null or lastTurnTotal is not 0.
+    readonly phaseOwner: PlayerSide | null
-    readonly action: GameAction | null
+
+    // The state of each player in the game.
+    readonly players: {
+        readonly [x in PlayerSide]: PlayerState
+    }
 
-    // If true, the top is rolling this turn.
+    // The action chosen for this round. Defaults to the first action in the list.
-    readonly isTopTurn: boolean
+    readonly action: GameAction
     // The total for the previous turn, or 0 if the current player is taking the first turn
     // If the current player fails when the turn total is 0, they take the penalty and pass the initiative without taking damage.
     // This can still end the game if the current action is capable of ending the game for this player and
     // this player has more damage than their maximum.
     readonly lastTurnTotal: number
-    // The dice available for the current turn, or null if the current player has not rolled yet this turn.
+    // The dice available for the current turn
-    readonly lastRoll: readonly DieResult[] | null
+    readonly lastRoll: readonly DieResult[]
     // The total value of the selected dice, or 0 if the selected dice cannot be scored.
     readonly selectedDiceValue: number
     // Whether the selected dice are sufficient to end the turn.
     readonly selectedDiceEndTurn: boolean
-    // The number of dice that have come up failures so far in the current turn
+    // The number of dice that have come up failures so far in the current turn, including the lastRoll.
     readonly countedFails: number
     // The total of the dice that have been scored so far this turn
     readonly currentTurnTotal: number

src/game/handleEvent.ts

@@ -0,0 +1,198 @@
+import { ErrorType, EventResult, IncomingEvent, IncomingEventType } from './gameEvent'
+import { GamePhase, GameState } from './gameState'
+import { DieResult, DieState, isSelectedState, setDeselected, setSelected, toggleSelected } from './dieState'
+import { isValidIndex } from '../util/precondition'
+
+export function handleEvent(state: GameState, event: IncomingEvent): EventResult<GameState> {
+    try {
+        switch (event.type) {
+            case IncomingEventType.SelectAction:
+                return handleSelectActionEvent<GameState>(state, event)
+            case IncomingEventType.ToggleSelectDie:
+                return handleToggleSelectIndexEvent<DieResult, GameState>(state, event)
+            case IncomingEventType.SelectAllDice:
+                return handleSelectAllEvent<DieResult, GameState>(state, true)
+            case IncomingEventType.DeselectAllDice:
+                return handleSelectAllEvent<DieResult, GameState>(state, false)
+            case IncomingEventType.HoldSelectedDice:
+                return handleHoldDiceEvent<DieResult, GameState>(state, true)
+            case IncomingEventType.ReleaseSelectedDice:
+                return handleHoldDiceEvent<DieResult, GameState>(state, false)
+            case IncomingEventType.Abort:
+                return handleAbortEvent<GameState>(state)
+            default:
+                return {
+                    newState: state,
+                    error: {
+                        type: ErrorType.UnexpectedError,
+                        message: 'Event type not yet implemented',
+                    },
+                }
+        }
+    } catch (e) {
+        return {
+            newState: state,
+            error: {
+                type: ErrorType.UnexpectedError,
+                message: `Failed handling event: ${e}`,
+            },
+        }
+    }
+}
+
+export interface SelectActionState<A> {
+    readonly gamePhase: GamePhase
+    readonly theme: {
+        readonly actions: readonly A[]
+    }
+    readonly action: A
+}
+
+export function handleSelectActionEvent<T extends SelectActionState<unknown>>(
+    state: T,
+    { index }: { readonly index: number },
+): EventResult<T> {
+    if (state.gamePhase !== GamePhase.ROUND_START) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `You can only change actions when the turn has not started yet.`,
+            },
+            newState: state,
+        }
+    }
+    if (index < 0 || index >= state.theme.actions.length || index !== Math.floor(index)) {
+        return {
+            error: {
+                type: ErrorType.InvalidIndex,
+                message: `Select an integer action index between 0 (inclusive) and ${state.theme.actions.length} (exclusive)`,
+            },
+            newState: state,
+        }
+    }
+    return {
+        newState: {
+            ...state,
+            action: state.theme.actions[index],
+        },
+        events: [],
+    }
+}
+
+export interface DiceStatesState<D extends { readonly state: DieState }> {
+    readonly gamePhase: GamePhase
+    readonly lastRoll: readonly D[]
+}
+
+export function handleToggleSelectIndexEvent<D extends { readonly state: DieState }, T extends DiceStatesState<D>>(
+    state: T,
+    { index }: { readonly index: number },
+): EventResult<T> {
+    if (state.gamePhase !== GamePhase.TURN_ROLLED) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `You can only toggle the selected state of a die when dice have been rolled.`,
+            },
+            newState: state,
+        }
+    }
+    if (!isValidIndex(index, state.lastRoll.length)) {
+        return {
+            newState: state,
+            error: {
+                type: ErrorType.InvalidIndex,
+                message: `Select an integer action index between 0 (inclusive) and ${state.lastRoll.length} (exclusive)`,
+            },
+        }
+    }
+    return {
+        newState: {
+            ...state,
+            lastRoll: [
+                ...state.lastRoll.slice(0, index),
+                {
+                    ...state.lastRoll[index],
+                    state: toggleSelected(state.lastRoll[index].state),
+                },
+                ...state.lastRoll.slice(index + 1),
+            ],
+        },
+        events: [],
+    }
+}
+
+function handleSelectAllEvent<D extends { readonly state: DieState }, T extends DiceStatesState<D>>(
+    state: T,
+    select: boolean,
+): EventResult<T> {
+    if (state.gamePhase !== GamePhase.TURN_ROLLED) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `You can only change the selected state of the dice when dice have been rolled.`,
+            },
+            newState: state,
+        }
+    }
+    return {
+        newState: {
+            ...state,
+            lastRoll: state.lastRoll.map<D>((x) => ({
+                ...x,
+                state: select ? setSelected(x.state) : setDeselected(x.state),
+            })),
+        },
+        events: [],
+    }
+}
+
+function handleHoldDiceEvent<D extends { readonly state: DieState }, T extends DiceStatesState<D>>(
+    state: T,
+    hold: boolean,
+): EventResult<T> {
+    if (state.gamePhase !== GamePhase.TURN_ROLLED) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `You can only toggle the hold state of dice when dice have been rolled.`,
+            },
+            newState: state,
+        }
+    }
+    return {
+        newState: {
+            ...state,
+            lastRoll: state.lastRoll.map<D>((v) => {
+                if (isSelectedState(v.state)) {
+                    return {
+                        ...v,
+                        state: hold ? DieState.HELD_SELECTED : DieState.SELECTED,
+                    }
+                } else {
+                    return v
+                }
+            }),
+        },
+        events: [],
+    }
+}
+
+function handleAbortEvent<T extends { readonly gamePhase: GamePhase }>(state: T): EventResult<T> {
+    if (state.gamePhase === GamePhase.ABORTED || state.gamePhase === GamePhase.VICTORY) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `The game is already over.`,
+            },
+            newState: state,
+        }
+    }
+    return {
+        newState: {
+            ...state,
+            gamePhase: GamePhase.ABORTED,
+        },
+        events: [],
+    }
+}

src/util/precondition.ts

@@ -0,0 +1,3 @@
+export function isValidIndex(index: number, length: number): boolean {
+    return Number.isInteger(index) && index >= 0 && index < length
+}

webpack.config.js

@@ -1,32 +1,32 @@
-const path = require('path');
+import { join } from 'path'
 
-module.exports = {
+export default {
-  output: {
+    output: {
-    filename: 'worker.js',
+        filename: 'worker.js',
-    path: path.join(__dirname, 'dist')
+        path: join(__dirname, 'dist'),
-  },
+    },
-  mode: 'production',
+    mode: 'production',
-  resolve: {
+    resolve: {
-    extensions: ['.ts', '.tsx', '.js'],
+        extensions: ['.ts', '.tsx', '.js'],
-    plugins: [],
+        plugins: [],
-    fallback: {
+        fallback: {
-      zlib: false,
+            zlib: false,
-      https: false,
+            https: false,
-      fs: false,
+            fs: false,
-      fastify: false,
+            fastify: false,
-      express: false,
+            express: false,
-      path: false
+            path: false,
-    }
+        },
-  },
+    },
-  module: {
+    module: {
-    rules: [
+        rules: [
-      {
+            {
-        test: /\.tsx?$/,
+                test: /\.tsx?$/,
-        loader: 'ts-loader',
+                loader: 'ts-loader',
-        options: {
+                options: {
-          transpileOnly: true
+                    transpileOnly: true,
-        }
+                },
-      }
+            },
-    ]
+        ],
-  }
+    },
-};
+}