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             observable.ts
        
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             / djx / src / main / ts / observable.ts
          
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      import { IDestroyable } from "@implab/core-amd/interfaces";

      export interface Sink<T> {

          next: (value: T) => void;

          error: (e: unknown) => void;

          complete: () => void;

      }

      export type Consumer<T> = Partial<Sink<T>>;

      export type Producer<T> = (sink: Sink<T>) => (void | (() => void));

      export interface Observable<T> {

          on(consumer: Partial<Sink<T>>): IDestroyable;

      } 

      const noop = () => {};

      const sink = <T>(consumer: Consumer<T>) => {

          const { next = noop, error = noop, complete = noop } = consumer;

          let done = false;

          return {

              next: (value: T) => done && next(value),

              error: (e: unknown) => done && (done = true, error(e)),

              complete: () => done && (done = true, complete())

          };

      }

      export const observe = <T>(producer: Producer<T>) : Observable<T> => ({

          on: (consumer: Consumer<T>) => ({

              destroy: producer(sink(consumer)) ?? noop

          })

      });

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				import { IDestroyable } from "@implab/core-amd/interfaces";

				export interface Sink<T> {
				next: (value: T) => void;
				error: (e: unknown) => void;
				complete: () => void;
				}

				export type Consumer<T> = Partial<Sink<T>>;

				export type Producer<T> = (sink: Sink<T>) => (void \| (() => void));

				export interface Observable<T> {
				on(consumer: Partial<Sink<T>>): IDestroyable;
				}

				const noop = () => {};

				const sink = <T>(consumer: Consumer<T>) => {
				const { next = noop, error = noop, complete = noop } = consumer;
				let done = false;

				return {
				next: (value: T) => done && next(value),
				error: (e: unknown) => done && (done = true, error(e)),
				complete: () => done && (done = true, complete())
				};
				}

				export const observe = <T>(producer: Producer<T>) : Observable<T> => ({
				on: (consumer: Consumer<T>) => ({
				destroy: producer(sink(consumer)) ?? noop
				})
				});