feat(callstatelib): add a callstate publishable lib

libs/shared/ngrx-callstate-store/src/lib/call-state.model.ts

@@ -0,0 +1,55 @@
+import { CustomError, ErrorHandler } from './external.model';
+
+export type LoadingState = 'INIT' | 'LOADING' | 'LOADED';
+
+export const UNKNOWN_ERROR_CAUSE = 'UNKNOWN_ERROR';
+export const UNKNOWN_ERROR_MESSAGE = 'unknown error occured';
+
+export class CallStateError {
+  name: string;
+  message: string;
+  stack?: string;
+
+  constructor(name = '', message = '') {
+    this.name = name;
+    this.message = message;
+  }
+}
+
+export class CallStateErrorHandler implements ErrorHandler<CallStateError> {
+  toError = (error: unknown): CallStateError => {
+    if (error instanceof CallStateError) return error;
+    if (error instanceof Error)
+      return new CallStateError(error.name, error.message);
+    return new CallStateError(UNKNOWN_ERROR_CAUSE, UNKNOWN_ERROR_MESSAGE);
+  };
+
+  getErrorMessage = (error?: CallStateError): string | undefined => {
+    return error?.message;
+  };
+}
+
+export interface EsuiteError {
+  code: string;
+}
+
+export interface ErrorState {
+  error: CustomError;
+}
+
+export type CallState = LoadingState | ErrorState;
+
+export const getErrorCallState = (
+  callState: CallState
+): CustomError | undefined => {
+  if (isErrorState(callState)) {
+    return callState.error;
+  }
+  return undefined;
+};
+
+export const isLoadedOrInError = (callState: CallState): boolean =>
+  callState === 'LOADED' || isErrorState(callState);
+
+export const isErrorState = (callState: CallState): callState is ErrorState =>
+  Object.prototype.hasOwnProperty.call(callState, 'error');