fix(config): migrate project config and harden SmartFile and StreamFile defaults for updated toolchain compatibility

ts/classes.streamfile.ts

@@ -33,7 +33,11 @@ export class StreamFile {
       const response = await plugins.smartrequest.SmartRequest.create()
         .url(url)
         .get();
-      return response.stream();
+      const responseStream = response.stream();
+      if (!responseStream) {
+        throw new Error(`No response stream available for ${url}`);
+      }
+      return responseStream;
     };
     const streamFile = new StreamFile(streamSource, undefined, smartFs);
     streamFile.multiUse = true;
@@ -117,9 +121,9 @@ export class StreamFile {
 
   // enable stream based multi use
   private cachedStreamBuffer?: Buffer;
-  public multiUse: boolean;
+  public multiUse: boolean = false;
   public used: boolean = false;
-  public byteLengthComputeFunction: () => Promise<number>;
+  public byteLengthComputeFunction?: () => Promise<number>;
 
   private constructor(streamSource: TStreamSource, relativeFilePath?: string, smartFs?: any) {
     this.streamSource = streamSource;
@@ -185,6 +189,10 @@ export class StreamFile {
     }
 
     this.checkMultiUse();
+    if (!this.relativeFilePath) {
+      throw new Error('Cannot write stream to directory without a relative file path.');
+    }
+
     const filePath = plugins.path.join(dirPathArg, this.relativeFilePath);
     const dirPath = plugins.path.parse(filePath).dir;
     await this.smartFs.directory(dirPath).recursive().create();
@@ -213,7 +221,7 @@ export class StreamFile {
   /**
    * Returns the size of the file content in bytes.
    */
-  public async getSize(): Promise<number> {
+  public async getSize(): Promise<number | null> {
     if (this.byteLengthComputeFunction) {
       return this.byteLengthComputeFunction();
     } else {