rename src to source

source/errors/application-error.ts

@@ -0,0 +1,14 @@
+/** An expected application failure whose message is safe to send to clients. */
+export class ApplicationError extends Error {
+    /**
+     * @param statusCode - HTTP-equivalent status returned to the client.
+     * @param message - Client-safe error summary.
+     */
+    constructor(
+        readonly statusCode: number,
+        message: string,
+    ) {
+        super(message);
+        this.name = 'ApplicationError';
+    }
+}