@code-art/rx-helpers
Version:
A library with Rxjs operators that can be used in your Angular 8 projects.
95 lines • 14.1 kB
JavaScript
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
const DESTROY_SUBJECT_SYMBOL = Symbol();
const DECORATOR_APPLIED_SYMBOL = Symbol();
function isComponentType(type) {
return type && !!type.ɵcmp;
}
function isDirectiveType(type) {
return type && !!type.ɵdir;
}
function isPipeType(type) {
return type && !!type.ɵpipe;
}
function isProviderType(type) {
return type && !!type.ɵprov;
}
function doOnDestroy() {
const subject = this[DESTROY_SUBJECT_SYMBOL];
if (subject) {
subject.next(0);
subject.complete();
this[DESTROY_SUBJECT_SYMBOL] = undefined;
}
}
function applyOnDestroyHook(def, handler) {
const oldOnDestroy = def.onDestroy;
def.onDestroy = function () {
if (oldOnDestroy) {
oldOnDestroy.apply(this);
}
handler.apply(this);
};
}
function applyOnDestroyToProvider(def, handler) {
const oldOnDestroy = def.prototype.ngOnDestroy;
def.prototype.ngOnDestroy = function (...args) {
if (oldOnDestroy) {
oldOnDestroy.apply(this, args);
}
handler.apply(this);
};
}
function applyOnDestroyToInstance(instance) {
if (!instance[DESTROY_SUBJECT_SYMBOL]) {
instance[DESTROY_SUBJECT_SYMBOL] = new Subject();
const constructor = instance.constructor;
if (typeof constructor === 'function') {
if (constructor[DECORATOR_APPLIED_SYMBOL]) {
return;
}
if (isPipeType(constructor)
|| isComponentType(constructor)
|| isDirectiveType(constructor)
|| isProviderType(constructor)) {
throw new Error(`To use ${takeUntilDestroyed.name} with Components, Pipes, Directives and Services add the @${TakeUntilDestroyed.name}.`);
}
}
if (typeof instance.ngOnDestroy !== 'function') {
throw new Error(`${takeUntilDestroyed.name} can only be applied to Components, Pipes, Directives and Services with @Injectable decorator or `
+ ` to object instance implementing OnDestroy interface.`);
}
const oldOnDestroy = instance.ngOnDestroy;
instance.ngOnDestroy = function (...args) {
oldOnDestroy.apply(instance, args);
doOnDestroy.apply(this);
};
}
}
function applyOnDestroyToClass(target) {
if (isComponentType(target)) {
applyOnDestroyHook(target.ɵcmp, doOnDestroy);
}
else if (isDirectiveType(target)) {
applyOnDestroyHook(target.ɵdir, doOnDestroy);
}
else if (isPipeType(target)) {
applyOnDestroyHook(target.ɵpipe, doOnDestroy);
}
else {
applyOnDestroyToProvider(target, doOnDestroy);
}
target[DECORATOR_APPLIED_SYMBOL] = true;
}
export function TakeUntilDestroyed() {
return applyOnDestroyToClass;
}
export function takeUntilDestroyed(instance) {
return (source) => {
const c = instance;
// const c = (component as any) as ComponentWithTakeUntilDestroy;
applyOnDestroyToInstance(c);
return source.pipe(takeUntil(c[DESTROY_SUBJECT_SYMBOL]));
};
}
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{ OnDestroy } from '@angular/core';\r\nimport { MonoTypeOperatorFunction, Observable, Subject } from 'rxjs';\r\nimport { takeUntil } from 'rxjs/operators';\r\n\r\nconst DESTROY_SUBJECT_SYMBOL = Symbol();\r\nconst DECORATOR_APPLIED_SYMBOL = Symbol();\r\n\r\ninterface InstanceWithTakeUntilDestroy extends OnDestroy {\r\n  [DESTROY_SUBJECT_SYMBOL]?: Subject<number>;\r\n}\r\n\r\ninterface FunctionWithDecorator extends Function {\r\n  [DECORATOR_APPLIED_SYMBOL]?: boolean;\r\n}\r\n\r\ninterface ComponentDefinition {\r\n  onDestroy: (() => void) | null;\r\n}\r\n\r\ninterface ComponentType extends FunctionWithDecorator {\r\n  ɵcmp: ComponentDefinition;\r\n}\r\n\r\ntype DirectiveDefinition = ComponentDefinition;\r\ntype PipeDefinition = ComponentDefinition;\r\n\r\ninterface ComponentType extends FunctionWithDecorator {\r\n  ɵcmp: ComponentDefinition;\r\n}\r\n\r\ninterface DirectiveType extends FunctionWithDecorator {\r\n  ɵdir: DirectiveDefinition;\r\n}\r\n\r\ninterface ProviderType extends FunctionWithDecorator {\r\n  ɵprov: any;\r\n}\r\n\r\ninterface PipeType extends FunctionWithDecorator {\r\n  ɵpipe: DirectiveDefinition;\r\n}\r\n\r\nfunction isComponentType(type: Function): type is ComponentType {\r\n  return type && !!(type as ComponentType).ɵcmp;\r\n}\r\n\r\nfunction isDirectiveType(type: Function): type is DirectiveType {\r\n  return type && !!(type as DirectiveType).ɵdir;\r\n}\r\n\r\nfunction isPipeType(type: Function): type is PipeType {\r\n  return type && !!(type as PipeType).ɵpipe;\r\n}\r\n\r\nfunction isProviderType(type: Function): type is ProviderType {\r\n  return type && !!(type as ProviderType).ɵprov;\r\n}\r\n\r\ntype HookableDefinition = (ComponentDefinition | DirectiveDefinition | PipeDefinition);\r\n\r\nfunction doOnDestroy(this: InstanceWithTakeUntilDestroy) {\r\n  const subject = this[DESTROY_SUBJECT_SYMBOL];\r\n  if (subject) {\r\n    subject.next(0);\r\n    subject.complete();\r\n    this[DESTROY_SUBJECT_SYMBOL] = undefined;\r\n  }\r\n}\r\n\r\nfunction applyOnDestroyHook(def: HookableDefinition, handler: (this: InstanceWithTakeUntilDestroy) => void) {\r\n  const oldOnDestroy = def.onDestroy;\r\n  def.onDestroy = function (this: InstanceWithTakeUntilDestroy): void {\r\n    if (oldOnDestroy) {\r\n      oldOnDestroy.apply(this);\r\n    }\r\n    handler.apply(this);\r\n  };\r\n}\r\n\r\nfunction applyOnDestroyToProvider(def: Function, handler: (this: InstanceWithTakeUntilDestroy) => void) {\r\n  const oldOnDestroy = def.prototype.ngOnDestroy;\r\n  def.prototype.ngOnDestroy = function (this: InstanceWithTakeUntilDestroy, ...args: []): void {\r\n    if (oldOnDestroy) {\r\n      oldOnDestroy.apply(this, args);\r\n    }\r\n    handler.apply(this);\r\n  };\r\n}\r\n\r\nfunction applyOnDestroyToInstance(instance: InstanceWithTakeUntilDestroy): void {\r\n  if (!instance[DESTROY_SUBJECT_SYMBOL]) {\r\n    instance[DESTROY_SUBJECT_SYMBOL] = new Subject<number>();\r\n    const constructor = instance.constructor as FunctionWithDecorator;\r\n    if (typeof constructor === 'function') {\r\n      if (constructor[DECORATOR_APPLIED_SYMBOL]) {\r\n        return;\r\n      }\r\n      if (isPipeType(constructor)\r\n        || isComponentType(constructor)\r\n        || isDirectiveType(constructor)\r\n        || isProviderType(constructor)) {\r\n        throw new Error(`To use ${\r\n            takeUntilDestroyed.name\r\n          } with Components, Pipes, Directives and Services add the @${\r\n          TakeUntilDestroyed.name\r\n          }.`\r\n        );\r\n      }\r\n    }\r\n\r\n    if (typeof instance.ngOnDestroy !== 'function') {\r\n      throw new Error(`${\r\n          takeUntilDestroyed.name\r\n        } can only be applied to Components, Pipes, Directives and Services with @Injectable decorator or `\r\n        + ` to object instance implementing OnDestroy interface.`\r\n      );\r\n    }\r\n    const oldOnDestroy = instance.ngOnDestroy;\r\n    instance.ngOnDestroy = function (this: InstanceWithTakeUntilDestroy, ...args) {\r\n      oldOnDestroy.apply(instance, args);\r\n      doOnDestroy.apply(this);\r\n    };\r\n  }\r\n}\r\n\r\nfunction applyOnDestroyToClass(target: FunctionWithDecorator): void {\r\n  if (isComponentType(target)) {\r\n    applyOnDestroyHook(target.ɵcmp, doOnDestroy);\r\n  } else if (isDirectiveType(target)) {\r\n    applyOnDestroyHook(target.ɵdir, doOnDestroy);\r\n  } else if (isPipeType(target)) {\r\n    applyOnDestroyHook(target.ɵpipe, doOnDestroy);\r\n  } else {\r\n    applyOnDestroyToProvider(target, doOnDestroy);\r\n  }\r\n  target[DECORATOR_APPLIED_SYMBOL] = true;\r\n}\r\n\r\nexport function TakeUntilDestroyed(): ClassDecorator {\r\n  return applyOnDestroyToClass;\r\n}\r\n\r\nexport function takeUntilDestroyed<T>(instance: any): MonoTypeOperatorFunction<T> {\r\n  return (source: Observable<T>) => {\r\n    const c = instance as InstanceWithTakeUntilDestroy;\r\n    // const c = (component as any) as ComponentWithTakeUntilDestroy;\r\n    applyOnDestroyToInstance(c);\r\n    return source.pipe(takeUntil(c[DESTROY_SUBJECT_SYMBOL] as Subject<number>));\r\n  };\r\n}\r\n"]}