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sflow.ts
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sflow.ts
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import DIE from "phpdie";
import type { Ord } from "rambda";
import type { FieldPathByValue } from "react-hook-form";
import type { Split } from "ts-toolbelt/out/String/Split";
import { sf } from ".";
import { asyncMaps } from "./asyncMaps";
import type { Awaitable } from "./Awaitable";
import { cacheLists } from "./cacheLists";
import { cacheSkips } from "./cacheSkips";
import { cacheTails } from "./cacheTails";
import { chunkBys } from "./chunkBys";
import { chunkIfs } from "./chunkIfs";
import { chunkIntervals } from "./chunkIntervals";
import { chunks } from "./chunks";
import type { ChunkTransformer } from "./chunkTransforms";
import { concats, concatStream } from "./concats";
import { confluences } from "./confluences";
import { convolves } from "./convolves";
import { debounces } from "./debounces";
import { filters } from "./filters";
import { flatMaps } from "./flatMaps";
import { flats } from "./flats";
import type { FlowSource } from "./FlowSource";
import { forEachs } from "./forEachs";
import { toStream } from "./froms";
import { heads } from "./heads";
import { limits } from "./limits";
import { lines } from "./lines";
import { logs } from "./logs";
import { mapAddFields } from "./mapAddFields";
import { maps } from "./maps";
import { merges } from "./merges";
import { mergeStream } from "./mergeStream";
import { mergeStreamsByAscend, mergeStreamsByDescend } from "./mergeStreamsBy";
import { nils } from "./nils";
import { peeks } from "./peeks";
import { pMaps } from "./pMaps";
import { portals } from "./portals";
import { reduceEmits } from "./reduceEmits";
import { reduces } from "./reduces";
import { riffles } from "./riffles";
import { skips } from "./skips";
import { slices } from "./slices";
import type { SourcesType } from "./SourcesType";
import { streamAsyncIterator } from "./streamAsyncIterator";
import { matchAlls, matchs, replaceAlls, replaces } from "./strings";
import { tails } from "./tails";
import { tees } from "./tees";
import { terminates } from "./terminates";
import { throttles } from "./throttles";
import { throughs } from "./throughs";
import { uniqBys, uniqs } from "./uniqs";
import type { Unwinded } from "./Unwinded";
import { unwinds } from "./unwinds";
import { wseToArray, wseToPromise } from "./wse";
import { csvFormats, csvParses, tsvFormats, tsvParses } from "./xsvStreams";
export type Reducer<S, T> = (state: S, x: T, i: number) => Awaitable<S>;
export type EmitReducer<S, T, R> = (
state: S,
x: T,
i: number
) => Awaitable<{ next: S; emit: R }>;
interface BaseFlow<T> {
_type: T;
readable: ReadableStream<T>;
writable: WritableStream<T>;
/** @deprecated use chunk*/
buffer(...args: Parameters<typeof chunks<T>>): sflow<T[]>;
cacheSkip(...args: Parameters<typeof cacheSkips<T>>): sflow<T>;
cacheList(...args: Parameters<typeof cacheLists<T>>): sflow<T>;
cacheTail(...args: Parameters<typeof cacheTails<T>>): sflow<T>;
chunk(...args: Parameters<typeof chunks<T>>): sflow<T[]>;
/** inverse of flat, chunk all items */
chunk(): sflow<T[]>;
/** inverse of flat, chunk or buffer a length as array */
chunk(...args: Parameters<typeof chunks<T>>): sflow<T[]>;
/** group by (only affect on concat items)*/
chunkBy(...args: Parameters<typeof chunkBys<T>>): sflow<T[]>;
/** @see {@link chunkIfs} */
chunkIf(...args: Parameters<typeof chunkIfs<T>>): sflow<T[]>;
chunkTransforms<T>(options: {
start?: ChunkTransformer<T>;
transform?: ChunkTransformer<T>;
flush?: ChunkTransformer<T>;
}): sflow<T>;
/** @see convolves */
convolve(...args: Parameters<typeof convolves<T>>): sflow<T[]>;
/** act as pipeThrough<T,T> */
portal: {
(): sflow<T>;
(stream: TransformStream<T, T>): sflow<T>;
(fn: (s: sflow<T>) => FlowSource<T>): sflow<T>; // fn must fisrt
};
/** act as pipeThrough, alias of by */
through: {
(): sflow<T>;
(stream: TransformStream<T, T>): sflow<T>;
<R>(fn: (s: sflow<T>) => FlowSource<R>): sflow<R>; // fn must fisrt
<R>(stream: TransformStream<T, R>): sflow<R>;
};
/** act as pipeThrough, alias of through */
by: {
(): sflow<T>;
(stream: TransformStream<T, T>): sflow<T>;
<R>(fn: (s: sflow<T>) => FlowSource<R>): sflow<R>; // fn must fisrt
<R>(stream: TransformStream<T, R>): sflow<R>;
};
/** act as pipeThrough, but lazy, only pull upstream when downstream pull */
byLazy: {
(stream: TransformStream<T, T>): sflow<T>;
<R>(stream: TransformStream<T, R>): sflow<R>;
};
/** @deprecated use chunkInterval */
interval(...args: Parameters<typeof chunkIntervals<T>>): sflow<T[]>;
chunkInterval(...args: Parameters<typeof chunkIntervals<T>>): sflow<T[]>;
debounce(...args: Parameters<typeof debounces<T>>): sflow<T>;
filter(fn: (x: T, i: number) => Awaitable<any>): sflow<T>; // fn must fisrt
filter(): sflow<NonNullable<T>>;
flatMap<R>(...args: Parameters<typeof flatMaps<T, R>>): sflow<R>;
/** @deprecated to join another stream, use merge instead */
join(fn: (s: WritableStream<T>) => void | any): sflow<T>;
/** @deprecated to join another stream, use merge instead */
join(stream?: ReadableStream<T>): sflow<T>;
merge(fn: (s: WritableStream<T>) => void | any): sflow<T>;
merge(stream?: ReadableStream<T>): sflow<T>;
concat(fn: (s: WritableStream<T>) => void | any): sflow<T>;
concat(stream?: ReadableStream<T>): sflow<T>;
limit(...args: Parameters<typeof limits<T>>): sflow<T>;
head(...args: Parameters<typeof heads<T>>): sflow<T>;
map<R>(...args: Parameters<typeof maps<T, R>>): sflow<R>;
log(...args: Parameters<typeof logs<T>>): sflow<T>;
peek(...args: Parameters<typeof peeks<T>>): sflow<T>;
riffle(...args: Parameters<typeof riffles<T>>): sflow<T>;
forEach(...args: Parameters<typeof forEachs<T>>): sflow<T>;
pMap<R>(fn: (x: T, i: number) => Awaitable<R>): sflow<R>;
pMap<R>(
fn: (x: T, i: number) => Awaitable<R>,
options?: {
concurrency?: number;
}
): sflow<R>;
asyncMap<R>(fn: (x: T, i: number) => Awaitable<R>): sflow<R>;
asyncMap<R>(
fn: (x: T, i: number) => Awaitable<R>,
options?: {
concurrency?: number;
}
): sflow<R>;
reduce(fn: (state: T | undefined, x: T, i: number) => Awaitable<T>): sflow<T>; // fn must fisrt
reduce(fn: Reducer<T, T>, initialState: T): sflow<T>;
reduce<S>(
fn: (state: S | undefined, x: T, i: number) => Awaitable<S>
): sflow<S>; // fn must fisrt
reduce<S>(fn: Reducer<S, T>, initialState: S): sflow<S>;
reduceEmit(fn: EmitReducer<T, T, T>): sflow<T>;
reduceEmit<R>(fn: EmitReducer<T, T, R>): sflow<R>;
reduceEmit<S, R>(fn: EmitReducer<S, T, R>, state: S): sflow<R>;
skip: (...args: Parameters<typeof skips<T>>) => sflow<T>;
slice: (...args: Parameters<typeof slices<T>>) => sflow<T>;
tail: (...args: Parameters<typeof tails<T>>) => sflow<T>;
uniq: (...args: Parameters<typeof uniqs<T>>) => sflow<T>;
uniqBy: <K>(...args: Parameters<typeof uniqBys<T, K>>) => sflow<T>;
tees(fn: (s: sflow<T>) => void | any): sflow<T>; // fn must fisrt
tees(stream?: WritableStream<T>): sflow<T>;
throttle: (...args: Parameters<typeof throttles<T>>) => sflow<T>;
// prevents
abort(...args: Parameters<typeof terminates<T>>): sflow<T>;
terminateSignal(...args: Parameters<typeof terminates<T>>): sflow<T>;
preventAbort: () => sflow<T>;
preventClose: () => sflow<T>;
preventCancel: () => sflow<T>;
// transform
onStart: (start: TransformerStartCallback<T>) => sflow<T>;
onTransform: <R>(transform: TransformerTransformCallback<T, R>) => sflow<R>;
onFlush: (flush: TransformerFlushCallback<T>) => sflow<T>;
// to promises
done: () => Promise<void>;
end: (pipeTo?: WritableStream<T>) => Promise<void>;
run: () => Promise<void>;
/** alias of pipeTo */
to: (pipeTo?: WritableStream<T>) => Promise<void>;
toArray: () => Promise<T[]>;
toEnd: () => Promise<void>;
toNil: () => Promise<void>;
/** Count stream items, and drop items */
toCount: () => Promise<number>;
/** Get first item from stream, and terminate stream */
toFirst: () => Promise<T>;
/** Get one item from stream
* throws if more than 1 item is emitted
* return undefined if no item returned
* return the item
*/
toExactlyOne: (options?: { required?: boolean }) => Promise<T | undefined>;
/** Get one item from stream
* throws if more than 1 item is emitted
* return undefined if no item returned
* return the item
* @deprecated use toExactlyOne
*/
toOne: (options?: { required?: boolean }) => Promise<T | undefined>;
/** Get one item from stream
* throws if more than 1 item is emitted
* throws if no items emitted, (required defaults to false)
* return the item
*/
toAtLeastOne: (options?: { required?: boolean }) => Promise<T>;
/** Returns a promise that always give you latest value of the stream */
// toLatest: () => Promise<{ value: T; readable: sflow<T> }>;
/** Get last item from stream, ignore others */
toLast: () => Promise<T>;
toLog(...args: Parameters<typeof logs<T>>): Promise<void>;
}
type ArrayFlow<T> = T extends ReadonlyArray<any>
? {
// inverse of chunk
flat: (...args: Parameters<typeof flats<T>>) => sflow<T[number]>;
}
: {};
type DictionaryFlow<T> = T extends Record<string, any>
? {
unwind<K extends FieldPathByValue<T, ReadonlyArray<any>>>(
key: K
): sflow<Unwinded<T, K>>;
mapAddField: <K extends string, R>(
...args: Parameters<typeof mapAddFields<K, T, R>>
) => sflow<
Omit<T, K> & {
[key in K]: R;
}
>;
}
: {};
type StreamsFlow<T> = T extends ReadableStream<infer R>
? {
// merge multiupstreams
/** @deprecated use confluencesByBreth */
confluence(...args: Parameters<typeof confluences<R>>): sflow<R>;
confluenceByZip(): sflow<R>;
confluenceByConcat(): sflow<R>;
confluenceByParallel(): sflow<R>;
confluenceByAscend(ordFn: (x: R) => Ord): sflow<R>;
confluenceByDescend(ordFn: (x: R) => Ord): sflow<R>;
// concat()
}
: {};
type TextFlow<T> = T extends string
? {
join: (sep: string) => sflow<string>;
lines: (
...args: Parameters<typeof lines>
) => sflow<
ReturnType<typeof lines> extends TransformStream<any, infer R>
? R
: never
>;
match: (
...args: Parameters<typeof matchs>
) => sflow<
ReturnType<typeof matchs> extends TransformStream<any, infer R>
? R
: never
>;
matchAll: (
...args: Parameters<typeof matchAlls>
) => sflow<
ReturnType<typeof matchAlls> extends TransformStream<any, infer R>
? R
: never
>;
replace: (
...args: Parameters<typeof replaces>
) => sflow<
ReturnType<typeof replaces> extends TransformStream<any, infer R>
? R
: never
>;
replaceAll: (
...args: Parameters<typeof replaceAlls>
) => sflow<
ReturnType<typeof replaceAlls> extends TransformStream<any, infer R>
? R
: never
>;
}
: {};
type XsvEncodeFlow<T> = T extends Record<string, any>
? {
csvFormat: (
...args: Parameters<typeof csvFormats>
) => sflow<
ReturnType<typeof csvFormats> extends TransformStream<any, infer R>
? R
: never
>;
tsvFormat: (
...args: Parameters<typeof tsvFormats>
) => sflow<
ReturnType<typeof tsvFormats> extends TransformStream<any, infer R>
? R
: never
>;
}
: {};
type XsvDecodeFlow<T> = T extends string
? {
csvParse<S extends string>(
header: S
): sflow<Record<Split<S, ",">[number], any>>;
csvParse<S extends string[]>(header: S): sflow<Record<S[number], any>>;
tsvParse<S extends string>(
header: S
): sflow<Record<Split<S, ",">[number], any>>;
tsvParse<S extends string[]>(header: S): sflow<Record<S[number], any>>;
}
: {};
type ToResponse<T> =
// toResponse
T extends string | Uint8Array
? {
toResponse: () => Response;
text: () => Promise<string>;
json: () => Promise<any>;
blob: () => Promise<Blob>;
arrayBuffer: () => Promise<ArrayBuffer>;
}
: {};
// maybe:
// subscribe (forEach+nils)
// find (filter+limit)
// distinct=uniq
//
// todo:
// catch, retry
//
// string stream process
// match
// replace
// join
//
export type sflowType<T extends sflow<any>> = T extends sflow<infer R>
? R
: never;
export type sflow<T> = ReadableStream<T> &
AsyncIterableIterator<T> &
BaseFlow<T> &
ArrayFlow<T> &
DictionaryFlow<T> &
StreamsFlow<T> &
TextFlow<T> &
XsvEncodeFlow<T> &
XsvDecodeFlow<T> &
ToResponse<T>;
/** stream flow */
// <T, SRCS extends FlowSource<T>[]>(...streams: SRCS): ReadableStream<
// SourcesType<SRCS>
// >
export const sflow = <T0, SRCS extends FlowSource<T0>[] = FlowSource<T0>[]>(
...srcs: SRCS
): sflow<SourcesType<SRCS>> => {
type T = SourcesType<SRCS>;
const r: ReadableStream<T> =
srcs.length === 1
? (toStream(srcs[0]) as ReadableStream<T>)
: (concatStream(srcs) as ReadableStream<T>);
// @ts-ignore todo
return Object.assign(r, {
_type: null as T,
get readable() {
return r;
},
// get writable() {
// DIE(new Error("WIP, merge into this stream"));
// return new WritableStream();
// },
portal: (...args: Parameters<typeof portals>) =>
sflow(r.pipeThrough(portals(...args))),
through: (...args: Parameters<typeof _throughs>) =>
sflow(r.pipeThrough(_throughs(...args))),
by: (...args: Parameters<typeof _throughs>) =>
sflow(r.pipeThrough(_throughs(...args))),
byLazy: <R>(t: TransformStream<T, R>) => _byLazy<T, R>(r, t),
mapAddField: (
...args: Parameters<typeof mapAddFields> // @ts-ignore
) => sflow(r.pipeThrough(mapAddFields(...args))),
cacheSkip: (...args: Parameters<typeof cacheSkips>) =>
sflow(r).byLazy(cacheSkips(...args)),
cacheList: (...args: Parameters<typeof cacheLists>) =>
sflow(r).byLazy(cacheLists(...args)),
cacheTail: (...args: Parameters<typeof cacheTails>) =>
sflow(r).byLazy(cacheTails(...args)),
chunkBy: (...args: Parameters<typeof chunkBys>) =>
sflow(r.pipeThrough(chunkBys(...args))),
chunkIf: (...args: Parameters<typeof chunkIfs>) =>
sflow(r.pipeThrough(chunkIfs(...args))),
buffer: (...args: Parameters<typeof chunks>) =>
sflow(r.pipeThrough(chunks(...args))),
chunk: (...args: Parameters<typeof chunks>) =>
sflow(r.pipeThrough(chunks(...args))),
convolve: (...args: Parameters<typeof convolves>) =>
sflow(r.pipeThrough(convolves(...args))),
abort: (...args: Parameters<typeof terminates>) =>
sflow(r.pipeThrough(terminates(...args))),
chunkInterval: (...args: Parameters<typeof chunkIntervals>) =>
sflow(r.pipeThrough(chunkIntervals(...args))),
/** @deprecated */
interval: (...args: Parameters<typeof chunkIntervals>) =>
sflow(r.pipeThrough(chunkIntervals(...args))),
debounce: (...args: Parameters<typeof debounces>) =>
sflow(r.pipeThrough(debounces(...args))),
filter: (...args: Parameters<typeof filters>) =>
sflow(r.pipeThrough(filters(...args))),
flatMap: (...args: Parameters<typeof flatMaps>) =>
sflow(r.pipeThrough(flatMaps(...args))),
flat: (
...args: Parameters<typeof flats> // @ts-expect-error array only
) => sflow(r).byLazy(flats(...args)),
join: (...args: Parameters<typeof riffles>) =>
sflow(r.pipeThrough(riffles(...args))),
match: (
...args: Parameters<typeof matchs> // @ts-expect-error string only
) => sflow(r.pipeThrough(matchs(...args))),
matchAll: (
...args: Parameters<typeof matchAlls> // @ts-expect-error string only
) => sflow(r.pipeThrough(matchAlls(...args))),
replace: (
...args: Parameters<typeof replaces> // @ts-expect-error string only
) => sflow(r.pipeThrough(replaces(...args))),
replaceAll: (
...args: Parameters<typeof replaceAlls> // @ts-expect-error string only
) => sflow(r.pipeThrough(replaceAlls(...args))),
// stream merging
merge: (...args: FlowSource<T>[]) => sflow(r.pipeThrough(merges(...args))),
concat: (srcs: FlowSource<FlowSource<T>>) =>
// @ts-ignore streams only
sflow(r.pipeThrough(concats(srcs))),
confluence: (
...args: Parameters<typeof confluences> // @ts-ignore streams only
) => sflow(r.pipeThrough(confluences(...args))),
confluenceByZip: () =>
sflow(r)
// @ts-ignore upstream accepts streams only
.by(confluences()),
confluenceByConcat: () =>
sflow(r)
// @ts-ignore upstream accepts streams only
.by((srcs) => concatStream(srcs)),
confluenceByParallel: () =>
sflow(r)
// @ts-ignore upstream accepts streams only
.by((srcs: ReadableStream<FlowSource<T>>) =>
sf(srcs)
.toArray()
.then((srcs: FlowSource<T>[]) => mergeStream(...srcs))
)
// @ts-ignore upstream accepts streams only
.confluence(),
confluenceByAscend: (ordFn: (x: T) => Ord) =>
sflow(r)
.chunk()
// @ts-ignore upstream accepts streams only
.map((srcs) => mergeStreamsByAscend(ordFn, srcs))
.confluence(),
confluenceByDescend: (ordFn: (x: T) => Ord) =>
sflow(r)
.chunk()
// @ts-ignore upstream accepts streams only
.map((srcs) => mergeStreamsByDescend(ordFn, srcs))
.confluence(),
limit: (...args: Parameters<typeof limits>) =>
sflow(r).byLazy(limits(...args)),
head: (...args: Parameters<typeof heads>) =>
sflow(r.pipeThrough(heads(...args))),
map: (...args: Parameters<typeof maps>) =>
sflow(r.pipeThrough(maps(...args))),
log: (...args: Parameters<typeof logs>) =>
sflow(r.pipeThrough(logs(...args))),
uniq: (...args: Parameters<typeof uniqs>) =>
sflow(r.pipeThrough(uniqs(...args))),
uniqBy: (...args: Parameters<typeof uniqBys>) =>
sflow(r.pipeThrough(uniqBys(...args))),
unwind: (
...args: Parameters<typeof unwinds> // @ts-ignore
) => sflow(r.pipeThrough(unwinds(...args))),
asyncMap: (...args: Parameters<typeof asyncMaps>) =>
sflow(r.pipeThrough(asyncMaps(...args))),
pMap: (...args: Parameters<typeof pMaps>) =>
sflow(r.pipeThrough(pMaps(...args))),
peek: (...args: Parameters<typeof peeks>) =>
sflow(r.pipeThrough(peeks(...args))),
riffle: (...args: Parameters<typeof riffles>) =>
sflow(r.pipeThrough(riffles(...args))),
forEach: (...args: Parameters<typeof forEachs>) =>
sflow(r.pipeThrough(forEachs(...args))),
reduce: (...args: Parameters<typeof reduces>) =>
sflow(r.pipeThrough(reduces(...args))),
reduceEmit: (...args: Parameters<typeof reduceEmits>) =>
sflow(r.pipeThrough(reduceEmits(...args))),
skip: (...args: Parameters<typeof skips>) =>
sflow(r.pipeThrough(skips(...args))),
slice: (...args: Parameters<typeof slices>) =>
sflow(r.pipeThrough(slices(...args))),
tail: (...args: Parameters<typeof tails>) =>
sflow(r.pipeThrough(tails(...args))),
tees: (...args: Parameters<typeof _tees>) =>
sflow(r.pipeThrough(_tees(...args))),
throttle: (...args: Parameters<typeof throttles>) =>
sflow(r.pipeThrough(throttles(...args))),
// line based data stream
csvFormat: (
...args: Parameters<typeof csvFormats> // @ts-expect-error xsv
) => sflow(r.pipeThrough(csvFormats(...args))),
tsvFormat: (
...args: Parameters<typeof tsvFormats> // @ts-expect-error xsv
) => sflow(r.pipeThrough(tsvFormats(...args))),
csvParse: (
...args: Parameters<typeof csvParses> // @ts-expect-error xsv
) => sflow(r.pipeThrough(csvParses(...args))),
tsvParse: (
...args: Parameters<typeof tsvParses> // @ts-expect-error xsv
) => sflow(r.pipeThrough(tsvParses(...args))),
// prevents
/** prevent upstream abort, ignore upstream errors */
preventAbort: () =>
sflow(r.pipeThrough(throughs(), { preventAbort: true })),
/** prevent upstream close */
preventClose: () =>
sflow(r.pipeThrough(throughs(), { preventClose: true })),
/** prevent downstream cancel, ignore downstream errors */
preventCancel: () =>
sflow(r.pipeThrough(throughs(), { preventCancel: true })),
onStart: (start: TransformerStartCallback<T>) =>
sflow(r).by(new TransformStream({ start })),
onTransform: <R>(transform: TransformerTransformCallback<T, R>) =>
sflow(r).by(new TransformStream({ transform })),
onFlush: (flush: TransformerFlushCallback<T>) =>
sflow(r).by(new TransformStream({ flush })),
// to promises
done: () => r.pipeTo(nils<T>()),
end: (dst = nils<T>()) => r.pipeTo(dst),
to: (dst = nils<T>()) => r.pipeTo(dst),
run: () => r.pipeTo(nils<T>()),
toEnd: () => r.pipeTo(nils<T>()),
toNil: () => r.pipeTo(nils<T>()),
toArray: () => wseToArray(r),
toCount: async () => {
let i = 0;
const d = r.getReader();
while (!(await d.read()).done) i++;
return i;
},
// toCount: async () =>
// (async function () {
// let i = 0;
// await r.pipeTo(new WritableStream({ write: () => void i++ }));
// return i;
// })(),
// toCount: async () => (await wseToArray(r)).length,
// toCount: async () =>
// (await sflow(r)
// .map((_, i) => i + 1)
// .toLast()) ?? 0, // TODO: optimize memory usage
toFirst: () => wseToPromise(sflow(r).limit(1, { terminate: true })),
toLast: () => wseToPromise(sflow(r).tail(1)),
toExactlyOne: async () => {
const a = await wseToArray(r);
if (a.length > 1) DIE(`Expect only 1 Item, but got ${a.length}`);
return a[0];
},
toOne: async () => {
const a = await wseToArray(r);
if (a.length > 1) DIE(`Expect only 1 Item, but got ${a.length}`);
return a[0];
},
toAtLeastOne: async () => {
const a = await wseToArray(r);
if (a.length > 1) DIE(`Expect only 1 Item, but got ${a.length}`);
if (a.length < 1) DIE(`Expect at least 1 Item, but got ${a.length}`);
return a[0];
},
/** call console.log on every item */
toLog: (...args: Parameters<typeof logs<T>>) =>
sflow(r.pipeThrough(logs(...args))).done(),
// toLatest: () => {
// const store = { value: undefined as T, readable: ReadableStream };
// const proxy = new DeepProxy(store, {
// get(target, key, receiver) {
// const val = Reflect.get(target, key, receiver);
// if (typeof val === "object" && val !== null) return this.nest(val);
// return val;
// },
// });
// const initialPromise = Promise.withResolvers();
// let initialized = false;
// store.readable = sflow(r).tees((r) =>
// r
// .forEach((e) => {
// store.value = e as T; // update store
// if (initialized) return;
// initialized = true;
// initialPromise.resolve(proxy);
// })
// .done()
// );
// return initialPromise.promise;
// },
// string stream process
lines: (
...args: Parameters<typeof lines> // @ts-expect-error works on string only
) => sflow(r.pipeThrough(lines(...args))),
// as response (only ReadableStream<string | UInt8Array>)
toResponse: (init?: ResponseInit) => new Response(r, init),
text: (init?: ResponseInit) => new Response(r, init).text(),
json: (init?: ResponseInit) => new Response(r, init).json(),
blob: (init?: ResponseInit) => new Response(r, init).blob(),
arrayBuffer: (init?: ResponseInit) => new Response(r, init).arrayBuffer(),
// as iterator
// [Symbol.asyncDispose]: async () => await r.pipeTo(nils()),
[Symbol.asyncIterator]: streamAsyncIterator<T>,
});
};
export const _tees: {
<T>(fn: (s: sflow<T>) => void | any): TransformStream<T, T>;
<T>(stream?: WritableStream<T>): TransformStream<T, T>;
} = (arg) => {
if (!arg) return new TransformStream();
if (arg instanceof WritableStream) return tees((s) => s.pipeTo(arg));
const fn = arg;
const { writable, readable } = new TransformStream();
const [a, b] = readable.tee();
// @ts-ignore
fn(sflow(a));
return { writable, readable: b };
};
export const _throughs: {
<T>(stream?: TransformStream<T, T>): TransformStream<T, T>;
<T, R>(stream: TransformStream<T, R>): TransformStream<T, R>;
<T, R>(fn: (s: sflow<T>) => FlowSource<R>): TransformStream<T, R>;
} = (arg: any) => {
if (!arg) return new TransformStream();
if (typeof arg !== "function") return throughs((s) => s.pipeThrough(arg));
const fn = arg;
const { writable, readable } = new TransformStream();
return { writable, readable: sflow(fn(sflow(readable))) };
};
export function _byLazy<T, R>(
r: ReadableStream<T>,
t: TransformStream<T, R>
): sflow<R> {
const reader = r.getReader();
const tw = t.writable.getWriter();
const tr = t.readable.getReader();
return sflow<R>(
new ReadableStream<R>(
{
start: async (ctrl) => {
(async function () {
while (true) {
const { done, value } = await tr.read();
if (done) return ctrl.close();
ctrl.enqueue(value);
}
})();
},
pull: async (ctrl) => {
const { done, value } = await reader.read();
if (done) return tw.close();
await tw.write(value);
},
cancel: async (r) => {
reader.cancel(r);
tr.cancel(r);
},
},
{ highWaterMark: 0 }
)
);
}
export { sf };