Add error handler

src/utils/error-handler.ts

@@ -0,0 +1,45 @@
+export enum Severity {
+  INFO = 'info',
+  WARNING = 'warning',
+  ERROR = 'error',
+}
+
+export interface ErrorHandlerError {
+  severity: Severity;
+  message: string;
+}
+
+export type ErrorMetadata = { [key: string]: any };
+
+export class ErrorHandler {
+  private static readonly errors: Array<ErrorHandlerError> = [];
+  private static metadata: ErrorMetadata = {};
+  private static onErrorListeners: Array<
+    (error: ErrorHandlerError, metadata: ErrorMetadata) => void
+  > = [];
+
+  public static addException(exception: Error) {
+    ErrorHandler.addError(Severity.ERROR, exception.message);
+  }
+
+  public static addError(severity: Severity, message: string) {
+    ErrorHandler.errors.push({ severity, message });
+    ErrorHandler.onErrorListeners.forEach((listener) =>
+      listener({ severity, message }, ErrorHandler.metadata)
+    );
+  }
+
+  public static addMetadata(key: string, value: any) {
+    const serialized = {};
+    for (const k in value) {
+      serialized[k] = value[k];
+    }
+    ErrorHandler.metadata[key] = serialized;
+  }
+
+  public static addOnErrorListener(
+    listener: (error: ErrorHandlerError, metadata: ErrorMetadata) => void
+  ) {
+    ErrorHandler.onErrorListeners.push(listener);
+  }
+}