feat(cli): add construct:prevlayer command

packs/BP/scripts/commands/PrevLayerCommand.js

@@ -0,0 +1,36 @@
+import { CustomCommandParamType, CustomCommandStatus, system } from '@minecraft/server';
+import { Command } from '../classes/Commands/Command';
+import { findInstance } from '../classes/Commands/lib/findInstance';
+import { commandError } from '../classes/Commands/lib/commandError';
+
+export class PrevLayerCommand extends Command {
+    constructor() {
+        super({
+            name: 'prevlayer',
+            description: 'construct.commands.prevlayer',
+            mandatoryParameters: [
+                { name: 'instanceName', type: CustomCommandParamType.String }
+            ],
+            callback: (source, instanceName) => this.run(source, instanceName)
+        });
+    }
+
+    run(source, instanceName) {
+        try {
+            const instance = findInstance(source, instanceName);
+            if (!instance) return { status: CustomCommandStatus.Failure };
+            system.run(() => {
+                instance.decreaseLayer();
+                source.sendMessage({
+                    rawtext: [{ translate: 'construct.commands.prevlayer.success',
+                                with: [instanceName, String(instance.getLayer())] }]
+                });
+            });
+            return { status: CustomCommandStatus.Success };
+        } catch (err) {
+            return commandError(source, err);
+        }
+    }
+}
+
+export const prevLayerCommand = new PrevLayerCommand();

packs/BP/scripts/main.js

@@ -20,6 +20,7 @@ import './commands/MoveCommand';
 import './commands/ActiveCommand';
 import './commands/LayerCommand';
 import './commands/NextLayerCommand';
+import './commands/PrevLayerCommand';
 
 // Other
 import './classes/BlockInfo';