Make created level.dat loadable in singleplayer (#71)

* make created worlds loadable in singleplayer

* add typings field

* make typings valid (no typechecking because of not tsconfig)

package.json

@@ -3,6 +3,7 @@
   "version": "2.7.0",
   "description": "Anvil Storage Provider implementation.",
   "main": "index.js",
+  "typings": "src/index.d.ts",
   "scripts": {
     "test": "mocha test/",
     "pretest": "npm run lint",

src/index.d.ts

@@ -0,0 +1,3 @@
+export const Anvil: typeof import('./anvil')
+export const chunk: typeof import('./chunk')
+export const level: typeof import('./level')

src/level.d.ts

@@ -0,0 +1,168 @@
+// readLevel, writeLevel
+
+// 1.8.8
+export interface LevelDatFull {
+    WorldGenSettings?: WorldGenSettings;
+    RandomSeed:           number[];
+    generatorName?:        string;
+    BorderCenterX:        number;
+    BorderCenterZ:        number;
+    Difficulty:           number;
+    DifficultyLocked:     number;
+    BorderSizeLerpTime:   number[];
+    Version?: {
+      Name: string
+      // id, snapshot
+    }
+    /** 0,1 */
+    raining:              number;
+    Time:                 number[];
+    GameType:             number;
+    MapFeatures:          number;
+    BorderDamagePerBlock: number;
+    BorderWarningBlocks:  number;
+    BorderSizeLerpTarget: number;
+    DayTime:              number[];
+    initialized:          number;
+    allowCommands:        number;
+    SizeOnDisk:           number[];
+    GameRules:            GameRules;
+    Player:               Player;
+    SpawnY:               number;
+    rainTime:             number;
+    thunderTime:          number;
+    SpawnZ:               number;
+    hardcore:             number;
+    SpawnX:               number;
+    clearWeatherTime:     number;
+    thundering:           number;
+    generatorVersion?:     number;
+    version:              number;
+    BorderSafeZone:       number;
+    generatorOptions?:     string;
+    LastPlayed:           number[];
+    BorderWarningTime:    number;
+    LevelName:            string;
+    BorderSize:           number;
+}
+
+export interface GameRules {
+  doTileDrops:         string;
+  doFireTick:          string;
+  reducedDebugInfo:    string;
+  naturalRegeneration: string;
+  doMobLoot:           string;
+  keepInventory:       string;
+  doEntityDrops:       string;
+  mobGriefing:         string;
+  randomTickSpeed:     string;
+  commandBlockOutput:  string;
+  doMobSpawning:       string;
+  logAdminCommands:    string;
+  sendCommandFeedback: string;
+  doDaylightCycle:     string;
+  showDeathMessages:   string;
+}
+
+export interface Player {
+  HurtByTimestamp:     number;
+  SleepTimer:          number;
+  Attributes:          Attribute[];
+  Invulnerable:        number;
+  PortalCooldown:      number;
+  AbsorptionAmount:    number;
+  abilities:           Abilities;
+  FallDistance:        number;
+  DeathTime:           number;
+  XpSeed:              number;
+  HealF:               number;
+  XpTotal:             number;
+  playerGameType:      number;
+  SelectedItem:        SelectedItem;
+  Motion:              number[];
+  UUIDLeast:           number[];
+  Health:              number;
+  foodSaturationLevel: number;
+  Air:                 number;
+  OnGround:            number;
+  Dimension:           number;
+  Rotation:            number[];
+  XpLevel:             number;
+  Score:               number;
+  UUIDMost:            number[];
+  Sleeping:            number;
+  Pos:                 number[];
+  Fire:                number;
+  XpP:                 number;
+  EnderItems:          any[];
+  foodLevel:           number;
+  foodExhaustionLevel: number;
+  HurtTime:            number;
+  SelectedItemSlot:    number;
+  Inventory:           SelectedItem[];
+  foodTickTimer:       number;
+}
+
+export interface Attribute {
+  Base: number;
+  Name: string;
+}
+
+export interface SelectedItem {
+  Slot?:  number;
+  id:     string;
+  Count:  number;
+  Damage: number;
+}
+
+export interface Abilities {
+  invulnerable: number;
+  mayfly:       number;
+  instabuild:   number;
+  walkSpeed:    number;
+  mayBuild:     number;
+  flying:       number;
+  flySpeed:     number;
+}
+
+// 1.16+
+
+export interface WorldGenSettings {
+  /** 0,1 */
+  bonus_chest:       number;
+  seed:              number[];
+  /** 0,1 */
+  generate_features: number;
+  dimensions:        Dimensions;
+}
+
+export interface Dimensions {
+  // :overworld, :the_nether, :the_end
+  [key: string]:  WorldGen;
+}
+
+export interface WorldGen {
+  generator: WorldGenGenerator;
+  // same as key
+  type:      string;
+}
+
+export interface WorldGenGenerator {
+  settings:     string;
+  seed:         number[];
+  biome_source: BiomeSource;
+  type:         string;
+}
+
+export interface BiomeSource {
+  seed:         number[];
+  /** only for overworld 0,1 */
+  large_biomes?: number;
+  // :noise, :flat, ?
+  type:         string;
+}
+
+export type LevelDatWrite = Pick<LevelDatFull, 'RandomSeed' | 'Version' | 'generatorName'>
+
+export function readLevel(path: string): Promise<LevelDatFull>
+export function writeLevel(path: string, value: LevelDatWrite): Promise<void>

src/level.js

@@ -27,6 +27,28 @@ async function writeLevel (path, value) {
       Data: {
         type: 'compound',
         value: {
+          // ...oldLevel.value?.Data?.value,
+          Version: {
+            type: 'compound',
+            value: {
+              Name: {
+                type: 'string',
+                value: value.Version.Name
+              }
+            }
+          },
+          LevelName: {
+            type: 'string',
+            value: 'prismarine-world'
+          },
+          generatorName: {
+            type: 'string',
+            value: value.generatorName
+          },
+          version: {
+            type: 'int',
+            value: 19133
+          },
           RandomSeed: {
             type: 'long',
             value: value.RandomSeed