plugin: add type assertions for strictNullChecks in runtime workers

Fix strictNullChecks:
- child-process-worker.ts: add definite assignment for childProcess
- custom-worker.ts: add assertions for pluginDevice and options
- node-fork-worker.ts: add catch block type annotation
- node-thread-worker.ts: add catch block type annotation
- python-worker.ts: add assertions for worker properties

server/src/plugin/runtime/child-process-worker.ts

@@ -6,7 +6,7 @@ import { RuntimeWorker, RuntimeWorkerOptions } from "./runtime-worker";
 export abstract class ChildProcessWorker extends EventEmitter implements RuntimeWorker {
     public pluginId: string;
     protected worker: child_process.ChildProcess | undefined;
-    killPromise: Promise<void>;
+    killPromise!: Promise<void>;
 
     get childProcess() {
         return this.worker;

server/src/plugin/runtime/custom-worker.ts

@@ -8,13 +8,13 @@ import { ChildProcessWorker } from "./child-process-worker";
 import { RuntimeWorkerOptions } from "./runtime-worker";
 
 export class CustomRuntimeWorker extends ChildProcessWorker {
-    serializer: ReturnType<typeof createRpcDuplexSerializer>;
-    fork: boolean;
+    serializer!: ReturnType<typeof createRpcDuplexSerializer>;
+    fork!: boolean;
 
     constructor(options: RuntimeWorkerOptions, runtime: ScryptedRuntime) {
         super(options);
 
-        const pluginDevice = runtime.findPluginDevice(this.pluginId);
+        const pluginDevice = runtime.findPluginDevice(this.pluginId)!;
         const scryptedRuntimeArguments: ScryptedRuntimeArguments = pluginDevice.state.scryptedRuntimeArguments?.value;
         if (!scryptedRuntimeArguments)
             throw new Error('custom runtime requires scryptedRuntimeArguments');
@@ -75,7 +75,7 @@ export class CustomRuntimeWorker extends ChildProcessWorker {
             this.serializer.sendMessage(message, reject, serializationContext);
         }
         catch (e) {
-            reject?.(e);
+            reject?.(e as Error);
         }
     }
 }

server/src/plugin/runtime/node-fork-worker.ts

@@ -105,7 +105,7 @@ export class NodeForkWorker extends ChildProcessWorker {
             });
         }
         catch (e) {
-            reject?.(e);
+            reject?.(e as Error);
         }
     }
 

server/src/plugin/runtime/node-thread-worker.ts

@@ -129,7 +129,7 @@ export class NodeThreadWorker extends EventEmitter implements RuntimeWorker {
             port.postMessage(postMessage, transferList);
         }
         catch (e) {
-            reject?.(e);
+            reject?.(e as Error);
         }
     }
 

server/src/plugin/runtime/python-worker.ts

@@ -26,7 +26,7 @@ export class PythonRuntimeWorker extends ChildProcessWorker {
         }
     }
 
-    serializer: ReturnType<typeof createRpcDuplexSerializer>;
+    serializer!: ReturnType<typeof createRpcDuplexSerializer>;
     peerin: Writable;
     peerout: Readable;
     _stdout = new PassThrough();
@@ -200,7 +200,7 @@ export class PythonRuntimeWorker extends ChildProcessWorker {
             this.serializer.sendMessage(message, reject, serializationContext);
         }
         catch (e) {
-            reject?.(e);
+            reject?.(e as Error);
         }
     }
 }