Rework to cache instead of serialize

Using lessons from other PRs

src/js/game/buildings/miner.js

@@ -44,15 +44,9 @@ export class MetaMinerBuilding extends MetaBuilding {
     /**
      * Creates the entity at the given location
      * @param {Entity} entity
-     * @param {GameRoot} root
      */
-    setupEntityComponents(entity, root) {
-        let itemBelow = null;
-        if (root) {
-            const staticComp = entity.components.StaticMapEntity;
-            itemBelow = root.map.getLowerLayerContentXY(staticComp.origin.x, staticComp.origin.y);
-        }
-        entity.addComponent(new MinerComponent({ minedItem: itemBelow }));
+    setupEntityComponents(entity) {
+        entity.addComponent(new MinerComponent({}));
         entity.addComponent(
             new ItemEjectorComponent({
                 slots: [{ pos: new Vector(0, 0), direction: enumDirection.top }],

src/js/game/components/miner.js

@@ -12,10 +12,10 @@ export class MinerComponent extends Component {
     }
 
     static getSchema() {
+        // cachedMinedItem is not serialized.
         return {
             lastMiningTime: types.ufloat,
             chainable: types.bool,
-            minedItem: types.nullable(types.obj(gItemRegistry)),
             itemChainBuffer: types.array(types.obj(gItemRegistry)),
         };
     }
@@ -23,14 +23,10 @@ export class MinerComponent extends Component {
     duplicateWithoutContents() {
         return new MinerComponent({
             chainable: this.chainable,
-            minedItem: this.minedItem,
         });
     }
 
-    /**
-     * @param {{chainable?: boolean, minedItem?: BaseItem}} param0
-     */
-    constructor({ chainable = false, minedItem = null }) {
+    constructor({ chainable = false }) {
         super();
         this.lastMiningTime = 0;
         this.chainable = chainable;
@@ -45,7 +41,7 @@ export class MinerComponent extends Component {
         /**
          * @type {BaseItem}
          */
-        this.minedItem = minedItem;
+        this.cachedMinedItem = null;
     }
 
     /**

src/js/game/systems/miner.js

@@ -25,8 +25,16 @@ export class MinerSystem extends GameSystemWithFilter {
 
             const minerComp = entity.components.Miner;
 
-            if (!minerComp.minedItem) {
-                continue;
+            if (!minerComp.cachedMinedItem) {
+                const staticComp = entity.components.StaticMapEntity;
+                const tileBelow = this.root.map.getLowerLayerContentXY(
+                    staticComp.origin.x,
+                    staticComp.origin.y
+                );
+                if (!tileBelow) {
+                    continue;
+                }
+                minerComp.cachedMinedItem = tileBelow;
             }
 
             // First, try to get rid of chained items
@@ -38,9 +46,9 @@ export class MinerSystem extends GameSystemWithFilter {
             }
 
             if (this.root.time.isIngameTimerExpired(minerComp.lastMiningTime, 1 / miningSpeed)) {
-                if (this.tryPerformMinerEject(entity, minerComp.minedItem)) {
+                if (this.tryPerformMinerEject(entity, minerComp.cachedMinedItem)) {
                     // Analytics hook
-                    this.root.signals.itemProduced.dispatch(minerComp.minedItem);
+                    this.root.signals.itemProduced.dispatch(minerComp.cachedMinedItem);
 
                     // Actually mine
                     minerComp.lastMiningTime = this.root.time.now();
@@ -105,10 +113,13 @@ export class MinerSystem extends GameSystemWithFilter {
                     if (!staticComp.shouldBeDrawn(parameters)) {
                         continue;
                     }
+                    if (!minerComp.cachedMinedItem) {
+                        continue;
+                    }
 
-                    if (minerComp.minedItem) {
+                    if (minerComp.cachedMinedItem) {
                         const padding = 3;
-                        parameters.context.fillStyle = minerComp.minedItem.getBackgroundColorAsResource();
+                        parameters.context.fillStyle = minerComp.cachedMinedItem.getBackgroundColorAsResource();
                         parameters.context.fillRect(
                             staticComp.origin.x * globalConfig.tileSize + padding,
                             staticComp.origin.y * globalConfig.tileSize + padding,
@@ -117,8 +128,8 @@ export class MinerSystem extends GameSystemWithFilter {
                         );
                     }
 
-                    if (minerComp.minedItem) {
-                        minerComp.minedItem.draw(
+                    if (minerComp.cachedMinedItem) {
+                        minerComp.cachedMinedItem.draw(
                             (0.5 + staticComp.origin.x) * globalConfig.tileSize,
                             (0.5 + staticComp.origin.y) * globalConfig.tileSize,
                             parameters