ngx-remotedata
Version:
RemoteData: Slaying a UI Antipattern with Angular
126 lines • 15.2 kB
JavaScript
import { Observable } from 'rxjs';
// ----------------------------
//
// Constructor functions
//
// ----------------------------
export const notAsked = () => {
return { tag: 'NotAsked' };
};
export const inProgress = (value) => {
return { tag: 'InProgress', value };
};
export const failure = (error, value) => {
return { tag: 'Failure', error, value };
};
export const success = (value) => {
return { tag: 'Success', value };
};
// ----------------------------
//
// Guards
//
// ----------------------------
export const isNotAsked = (value) => {
return (value !== null &&
value !== undefined &&
value.hasOwnProperty('tag') &&
value.tag === 'NotAsked');
};
export const isInProgress = (value) => {
return (value !== null &&
value !== undefined &&
value.hasOwnProperty('tag') &&
value.tag === 'InProgress');
};
export const isFailure = (value) => {
return (value !== null &&
value !== undefined &&
value.hasOwnProperty('tag') &&
value.tag === 'Failure');
};
export const isSuccess = (value) => {
return (value !== null &&
value !== undefined &&
value.hasOwnProperty('tag') &&
value.tag === 'Success');
};
export const isRemoteData = (value) => {
const hasRemoteDataTag = (tag) => tag === 'NotAsked' ||
tag === 'InProgress' ||
tag === 'Success' ||
tag === 'Failure';
return (value !== null &&
value !== undefined &&
value.hasOwnProperty('tag') &&
hasRemoteDataTag(value.tag));
};
// ----------------------------
//
// Folds
//
// ----------------------------
export const fold = (onNotAsked, onInProgress, onFailure, onSuccess, rd) => {
switch (rd.tag) {
case 'NotAsked':
return onNotAsked();
case 'InProgress':
return onInProgress(rd.value);
case 'Failure':
return onFailure(rd.error, rd.value);
case 'Success':
return onSuccess(rd.value);
}
};
export const getOrElse = (rd, defaultValue) => {
switch (rd.tag) {
case 'Success':
return rd.value;
default:
return defaultValue;
}
};
// ----------------------------
//
// Transformations
//
// ----------------------------
export const map = (fn, rd) => isSuccess(rd) ? success(fn(rd.value)) : rd;
export const mapFailure = (fn, rd) => isFailure(rd) ? failure(fn(rd.error)) : rd;
export const chain = (fn, rd) => isSuccess(rd) ? fn(rd.value) : rd;
// ----------------------------
//
// RxJs specific
//
// ----------------------------
/**
* Emits only when source Observable is a Success
* @returns Success<T>
*/
export function filterSuccess() {
return (source) => new Observable(subscriber => {
source.subscribe({
next(value) {
if (isSuccess(value)) {
subscriber.next(value);
}
}
});
});
}
/**
* Emits only when source Observable is a Failure
* @returns Failure<E, T>
*/
export function filterFailure() {
return (source) => new Observable(subscriber => {
source.subscribe({
next(value) {
if (isFailure(value)) {
subscriber.next(value);
}
}
});
});
}
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{ Observable } from 'rxjs';\n\ntype DefaultError = string;\n\nexport interface NotAsked {\n  readonly tag: 'NotAsked';\n}\n\nexport interface InProgress<T> {\n  readonly tag: 'InProgress';\n  readonly value: T | undefined;\n}\n\nexport interface Failure<E, T> {\n  readonly tag: 'Failure';\n  readonly value: T | undefined;\n  error: E;\n}\n\nexport interface Success<T> {\n  readonly tag: 'Success';\n  readonly value: T;\n}\n\n// ----------------------------\n//\n//  Constructor functions\n//\n// ----------------------------\n\nexport const notAsked = <T, E = DefaultError>(): RemoteData<T, E> => {\n  return { tag: 'NotAsked' };\n};\n\nexport const inProgress = <T, E = DefaultError>(\n  value?: T\n): RemoteData<T, E> => {\n  return { tag: 'InProgress', value };\n};\n\nexport const failure = <T, E = DefaultError>(\n  error: E,\n  value?: T\n): RemoteData<T, E> => {\n  return { tag: 'Failure', error, value };\n};\n\nexport const success = <T, E = DefaultError>(value: T): RemoteData<T, E> => {\n  return { tag: 'Success', value };\n};\n\n// ----------------------------\n//\n//  Guards\n//\n// ----------------------------\n\nexport const isNotAsked = <T, E>(value: unknown): value is NotAsked => {\n  return (\n    value !== null &&\n    value !== undefined &&\n    (value as object).hasOwnProperty('tag') &&\n    (value as RemoteData<T, E>).tag === 'NotAsked'\n  );\n};\n\nexport const isInProgress = <T, E>(value: unknown): value is InProgress<T> => {\n  return (\n    value !== null &&\n    value !== undefined &&\n    (value as object).hasOwnProperty('tag') &&\n    (value as RemoteData<T, E>).tag === 'InProgress'\n  );\n};\n\nexport const isFailure = <T, E>(value: unknown): value is Failure<E, T> => {\n  return (\n    value !== null &&\n    value !== undefined &&\n    (value as object).hasOwnProperty('tag') &&\n    (value as RemoteData<T, E>).tag === 'Failure'\n  );\n};\n\nexport const isSuccess = <T, E>(value: unknown): value is Success<T> => {\n  return (\n    value !== null &&\n    value !== undefined &&\n    (value as object).hasOwnProperty('tag') &&\n    (value as RemoteData<T, E>).tag === 'Success'\n  );\n};\n\nexport const isRemoteData = <T, E = DefaultError>(\n  value: unknown\n): value is RemoteData<T, E> => {\n  const hasRemoteDataTag = (tag: RemoteData<any, any>['tag']) =>\n    tag === 'NotAsked' ||\n    tag === 'InProgress' ||\n    tag === 'Success' ||\n    tag === 'Failure';\n  return (\n    value !== null &&\n    value !== undefined &&\n    (value as object).hasOwnProperty('tag') &&\n    hasRemoteDataTag((value as RemoteData<T, E>).tag)\n  );\n};\n\n// ----------------------------\n//\n//  Folds\n//\n// ----------------------------\n\nexport const fold = <T, E>(\n  onNotAsked: () => T,\n  onInProgress: (value: T | undefined) => T,\n  onFailure: (error: E, value: T | undefined) => T,\n  onSuccess: (value: T) => T,\n  rd: RemoteData<T, E>\n): T => {\n  switch (rd.tag) {\n    case 'NotAsked':\n      return onNotAsked();\n    case 'InProgress':\n      return onInProgress(rd.value);\n    case 'Failure':\n      return onFailure(rd.error, rd.value);\n    case 'Success':\n      return onSuccess(rd.value);\n  }\n};\n\nexport const getOrElse = <T, E>(rd: RemoteData<T, E>, defaultValue: T): T => {\n  switch (rd.tag) {\n    case 'Success':\n      return rd.value;\n    default:\n      return defaultValue;\n  }\n};\n\n// ----------------------------\n//\n//  Transformations\n//\n// ----------------------------\n\nexport const map = <A, B, E>(\n  fn: (a: A) => B,\n  rd: RemoteData<A, E>\n): RemoteData<B, E> =>\n  isSuccess(rd) ? success(fn(rd.value)) : (rd as RemoteData<B, E>);\n\nexport const mapFailure = <A, E, F>(\n  fn: (e: E) => F,\n  rd: RemoteData<A, E>\n): RemoteData<A, F> =>\n  isFailure(rd) ? failure(fn(rd.error)) : (rd as RemoteData<A, F>);\n\nexport const chain = <A, B, E>(\n  fn: (a: A) => RemoteData<B, E>,\n  rd: RemoteData<A, E>\n): RemoteData<B, E> =>\n  isSuccess(rd) ? fn(rd.value) : (rd as RemoteData<B, E>);\n\n// ----------------------------\n//\n//  RxJs specific\n//\n// ----------------------------\n\n/**\n * Emits only when source Observable is a Success\n * @returns Success<T>\n */\nexport function filterSuccess() {\n  return <T, E>(source: Observable<RemoteData<T, E>>): Observable<Success<T>> =>\n    new Observable(subscriber => {\n      source.subscribe({\n        next(value) {\n          if (isSuccess(value)) {\n            subscriber.next(value);\n          }\n        }\n      });\n    });\n}\n\n/**\n * Emits only when source Observable is a Failure\n * @returns Failure<E, T>\n */\nexport function filterFailure() {\n  return <T, E>(\n    source: Observable<RemoteData<T, E>>\n  ): Observable<Failure<E, T>> =>\n    new Observable(subscriber => {\n      source.subscribe({\n        next(value) {\n          if (isFailure(value)) {\n            subscriber.next(value);\n          }\n        }\n      });\n    });\n}\n\n// ----------------------------\n//\n//  RemoteData type\n//\n// ----------------------------\n\nexport type RemoteData<T, E = string> =\n  | NotAsked\n  | InProgress<T>\n  | Failure<E, T>\n  | Success<T>;\n"]}