Fix tests for Node 15

package.json

@@ -13,9 +13,9 @@
             "url": "https://github.com/Wenzil"
         },
         {
-           "name": "Jerry Kurian",
+            "name": "Jerry Kurian",
-           "email": "jerrykurian@protonmail.com",
+            "email": "jerrykurian@protonmail.com",
-           "url": "https://github.com/jkurian"
+            "url": "https://github.com/jkurian"
         },
         {
             "name": "Lewis Diamond",
@@ -42,29 +42,26 @@
     },
     "dependencies": {},
     "devDependencies": {
-        "@types/chai": "^4.1.7",
+        "@ava/typescript": "^1.1.1",
-        "@types/node": "^12.12.15",
+        "@types/chai": "^4.2.14",
-        "@types/sinon": "^7.0.13",
+        "@types/node": "^14.14.25",
-        "ava": "^2.4.0",
+        "@types/sinon": "^9.0.10",
-        "chai": "^4.2.0",
+        "ava": "^3.15.0",
+        "chai": "^4.3.0",
+        "prettier": "^2.2.1",
+        "sinon": "^9.2.4",
         "stromjs": "./",
-        "prettier": "^1.14.3",
+        "ts-node": "^9.1.1",
-        "sinon": "^7.4.2",
+        "tslint": "^6.1.3",
-        "ts-node": "^8.3.0",
-        "tslint": "^5.11.0",
         "tslint-config-prettier": "^1.16.0",
-        "tslint-plugin-prettier": "^2.0.1",
+        "tslint-plugin-prettier": "^2.3.0",
-        "typescript": "^3.5.3"
+        "typescript": "^4.1.3"
     },
     "ava": {
         "files": [
             "tests/*.spec.ts",
             "tests/utils/*.spec.ts"
         ],
-        "sources": [
-            "src/**/*.ts"
-        ],
-        "compileEnhancements": false,
         "failWithoutAssertions": false,
         "extensions": [
             "ts"

samples/parallelMap.js

@@ -8,7 +8,7 @@ strom
     .fromArray([1, 2, 3, 4, 6, 8])
     .pipe(
         strom.parallelMap(async d => {
-            await sleep(10000 - d * 1000);
+            await sleep(1000 - d * 100);
             return `${d}`;
         }, 3),
     )

src/functions/baseDefinitions.ts

@@ -1,5 +1,5 @@
 export interface WithEncoding {
-    encoding: string;
+    encoding: BufferEncoding;
 }
 
 export enum SerializationFormats {

src/functions/compose.ts

@@ -1,10 +1,8 @@
-import { AllStreams, isReadable } from "../helpers";
+import { isReadable, isWritable } from "../helpers";
-import { PassThrough, pipeline, TransformOptions, Transform } from "stream";
+import { PassThrough, pipeline, TransformOptions, Transform, Stream, Readable, Writable } from "stream";
 
 export function compose(
-    streams: Array<
+    streams: (Readable | Writable)[],
-        NodeJS.ReadableStream | NodeJS.ReadWriteStream | NodeJS.WritableStream
-    >,
     errorCallback?: (err: any) => void,
     options?: TransformOptions,
 ): Compose {
@@ -15,30 +13,30 @@ export function compose(
     return new Compose(streams, errorCallback, options);
 }
 
-enum EventSubscription {
-    Last = 0,
-    First,
-    All,
-    Self,
-}
 
 export class Compose extends Transform {
-    private first: AllStreams;
+    private first: Writable & Readable;
-    private last: AllStreams;
+    private last: Readable;
-    private streams: AllStreams[];
+    private streams: Stream[];
-    private inputStream: ReadableStream;
 
     constructor(
-        streams: AllStreams[],
+        streams: (Readable | Writable)[],
         errorCallback?: (err: any) => void,
         options?: TransformOptions,
     ) {
         super(options);
         this.first = new PassThrough(options);
-        this.last = streams[streams.length - 1];
+        const last = streams.pop();
+        if (last && isReadable(last)) {
+            this.last = last;
+        } else {
+            throw new TypeError("Invalid last stream provided, it must be readable");
+        }
         this.streams = streams;
         pipeline(
-            [this.first, ...streams],
+            [this.first,
+            ...streams,
+            this.last],
             errorCallback ||
                 ((error: any) => {
                     if (error) {
@@ -48,10 +46,10 @@ export class Compose extends Transform {
         );
 
         if (isReadable(this.last)) {
-            (this.last as NodeJS.ReadWriteStream).pipe(
+            this.last.pipe(
                 new Transform({
                     ...options,
-                    transform: (d: any, encoding, cb) => {
+                    transform: (d: any, _encoding, cb) => {
                         this.push(d);
                         cb();
                     },
@@ -60,13 +58,13 @@ export class Compose extends Transform {
         }
     }
 
-    public _transform(chunk: any, encoding: string, cb: any) {
+    public _transform(chunk: any, encoding: BufferEncoding, cb: any) {
-        (this.first as NodeJS.WritableStream).write(chunk, encoding, cb);
+        this.first.write(chunk, encoding, cb);
     }
 
     public _flush(cb: any) {
-        if (isReadable(this.first)) {
+        if (isWritable(this.first)) {
-            (this.first as any).push(null);
+            this.first.push(null);
         }
         this.last.once("end", () => {
             cb();

src/functions/demux.ts

@@ -1,9 +1,7 @@
-import { DuplexOptions, Duplex, Transform } from "stream";
+import { DuplexOptions, Duplex, Transform, Writable } from "stream";
 
 import { isReadable } from "../helpers";
 
-type DemuxStreams = NodeJS.WritableStream | NodeJS.ReadWriteStream;
-
 export interface DemuxOptions extends DuplexOptions {
     remultiplex?: boolean;
 }
@@ -12,7 +10,7 @@ export function demux(
     pipelineConstructor: (
         destKey?: string,
         chunk?: any,
-    ) => DemuxStreams | DemuxStreams[],
+    ) => Writable | Writable[],
     demuxBy: string | ((chunk: any) => string),
     options?: DemuxOptions,
 ): Duplex {
@@ -21,20 +19,20 @@ export function demux(
 
 class Demux extends Duplex {
     private streamsByKey: {
-        [key: string]: DemuxStreams[];
+        [key: string]: Writable[];
     };
     private demuxer: (chunk: any) => string;
     private pipelineConstructor: (
         destKey?: string,
         chunk?: any,
-    ) => DemuxStreams[];
+    ) => Writable[];
     private remultiplex: boolean;
     private transform: Transform;
     constructor(
         pipelineConstructor: (
             destKey?: string,
             chunk?: any,
-        ) => DemuxStreams | DemuxStreams[],
+        ) => Writable | Writable[],
         demuxBy: string | ((chunk: any) => string),
         options: DemuxOptions = {},
     ) {
@@ -60,7 +58,7 @@ class Demux extends Duplex {
     }
 
     // tslint:disable-next-line
-    public _read(size: number) {}
+    public _read(_size: number) {}
 
     public async _write(chunk: any, encoding: any, cb: any) {
         const destKey = this.demuxer(chunk);
@@ -70,7 +68,7 @@ class Demux extends Duplex {
 
             newPipelines.forEach(newPipeline => {
                 if (this.remultiplex && isReadable(newPipeline)) {
-                    (newPipeline as NodeJS.ReadWriteStream).pipe(
+                    newPipeline.pipe(
                         this.transform,
                     );
                 } else if (this.remultiplex) {
@@ -88,7 +86,7 @@ class Demux extends Duplex {
                 pendingDrains.push(
                     new Promise(resolve => {
                         pipeline.once("drain", () => {
-                            resolve();
+                            resolve(null);
                         });
                     }),
                 );
@@ -99,7 +97,7 @@ class Demux extends Duplex {
     }
 
     public _flush() {
-        const pipelines: DemuxStreams[] = Array.prototype.concat.apply(
+        const pipelines: Writable[] = Array.prototype.concat.apply(
             [],
             Object.values(this.streamsByKey),
         );
@@ -121,7 +119,7 @@ class Demux extends Duplex {
     }
 
     public _destroy(error: any, cb: (error?: any) => void) {
-        const pipelines: DemuxStreams[] = [].concat.apply(
+        const pipelines: Writable[] = [].concat.apply(
             [],
             Object.values(this.streamsByKey),
         );

src/functions/index.ts

@@ -1,9 +1,4 @@
-import {
+import { TransformOptions } from "stream";
-    Transform,
-    TransformOptions,
-    WritableOptions,
-    ReadableOptions,
-} from "stream";
 import { accumulator, accumulatorBy } from "./accumulator";
 import { batch } from "./batch";
 import { child } from "./child";

src/functions/replace.ts

@@ -9,7 +9,7 @@ export function replace(
     const decoder = new StringDecoder(options.encoding);
     return new Transform({
         readableObjectMode: true,
-        transform(chunk: Buffer, encoding, callback) {
+        transform(chunk: Buffer, _encoding, callback) {
             const asString = decoder.write(chunk);
             // Take care not to break up multi-byte characters spanning multiple chunks
             if (asString !== "" || chunk.length === 0) {

src/helpers.ts

@@ -1,17 +1,23 @@
+import { Readable, Stream, Writable } from "stream";
+
 export async function sleep(time: number): Promise<{} | null> {
     return time > 0 ? new Promise(resolve => setTimeout(resolve, time)) : null;
 }
 
-export type AllStreams =
-    | NodeJS.ReadableStream
-    | NodeJS.ReadWriteStream
-    | NodeJS.WritableStream;
-
 export function isReadable(
-    stream: AllStreams,
+    stream: Stream,
-): stream is NodeJS.WritableStream {
+): stream is Readable {
     return (
-        (stream as NodeJS.ReadableStream).pipe !== undefined &&
+        (stream as Readable).pipe !== undefined &&
-        (stream as any).readable === true
+        (stream as Readable).readable === true
+    );
+}
+
+export function isWritable(
+    stream: Stream,
+): stream is Writable {
+    return (
+        (stream as Writable).write !== undefined &&
+        (stream as Writable).writable === true
     );
 }

tests/compose.spec.ts

@@ -144,7 +144,7 @@ test("compose() writable length should be less than highWaterMark when handing w
 });
 
 test("compose() should emit drain event ~rate * highWaterMark ms for every write that causes backpressure", async t => {
-    t.plan(2);
+    t.plan(7);
     const _rate = 100;
     const highWaterMark = 2;
     return new Promise(async (resolve, reject) => {
@@ -529,10 +529,10 @@ test.cb("compose() `finish` and `end` propagates", t => {
     });
     composed.on("end", () => {
         t.pass();
-        t.end();
     });
     sink.on("finish", () => {
         t.pass();
+        t.end();
     });
 
     const input = [

tests/demux.spec.ts

@@ -21,13 +21,11 @@ test.cb("demux() constructor should be called once per key", t => {
         { key: "a", visited: [] },
         { key: "b", visited: [] },
     ];
-    const construct = sinon.spy((destKey: string) => {
+    const construct = sinon.spy((_destKey: string) => {
-        const dest = map((chunk: Test) => {
+        return map((chunk: Test) => {
             chunk.visited.push(1);
             return chunk;
         });
-
-        return dest;
     });
 
     const demuxed = demux(construct, "key", {});
@@ -124,13 +122,11 @@ test.cb("demux() constructor should be called once per key using keyBy", t => {
         { key: "b", visited: [] },
     ];
 
-    const construct = sinon.spy((destKey: string) => {
+    const construct = sinon.spy((_destKey: string) => {
-        const dest = map((chunk: Test) => {
+        return map((chunk: Test) => {
             chunk.visited.push(1);
             return chunk;
         });
-
-        return dest;
     });
 
     const demuxed = demux(construct, item => item.key, {});
@@ -206,7 +202,7 @@ test("demux() write should return false and emit drain if more than highWaterMar
         let pendingReads = input.length;
         const highWaterMark = 5;
         const slowProcessorSpeed = 25;
-        const construct = (destKey: string) => {
+        const construct = (_destKey: string) => {
             const first = map(
                 async (chunk: Chunk) => {
                     await sleep(slowProcessorSpeed);
@@ -231,7 +227,7 @@ test("demux() write should return false and emit drain if more than highWaterMar
             highWaterMark,
         });
 
-        _demux.on("error", err => {
+        _demux.on("error", _err => {
             reject();
         });
 
@@ -239,7 +235,7 @@ test("demux() write should return false and emit drain if more than highWaterMar
             const res = _demux.write(item);
             expect(_demux._writableState.length).to.be.at.most(highWaterMark);
             if (!res) {
-                await new Promise((resolv, rej) => {
+                await new Promise((resolv, _rej) => {
                     _demux.once("drain", () => {
                         expect(_demux._writableState.length).to.be.equal(0);
                         t.pass();
@@ -270,7 +266,7 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
         const highWaterMark = 5;
         const slowProcessorSpeed = 25;
 
-        const construct = (destKey: string) => {
+        const construct = (_destKey: string) => {
             const first = map(
                 async (chunk: Chunk) => {
                     await sleep(slowProcessorSpeed);
@@ -292,7 +288,7 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
         const _demux = demux(construct, "key", {
             highWaterMark,
         });
-        _demux.on("error", err => {
+        _demux.on("error", _err => {
             reject();
         });
 
@@ -300,14 +296,14 @@ test("demux() should emit one drain event after slowProcessorSpeed * highWaterMa
         for (const item of input) {
             const res = _demux.write(item);
             if (!res) {
-                await new Promise((resolv, rej) => {
+                await new Promise((resolv, _rej) => {
                     // This event should be received after all items in demux are processed
                     _demux.once("drain", () => {
                         expect(performance.now() - start).to.be.greaterThan(
                             slowProcessorSpeed * highWaterMark,
                         );
                         t.pass();
-                        resolv();
+                        resolv(null);
                     });
                 });
             }
@@ -332,7 +328,7 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
             { key: "a", mapped: [] },
         ];
         let pendingReads = input.length;
-        const construct = (destKey: string) => {
+        const construct = (_destKey: string) => {
             const first = map(
                 async (chunk: Chunk) => {
                     await sleep(50);
@@ -354,7 +350,7 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
             highWaterMark: 5,
         });
 
-        _demux.on("error", err => {
+        _demux.on("error", _err => {
             reject();
         });
 
@@ -364,7 +360,7 @@ test("demux() should emit one drain event when writing 6 items with highWaterMar
             if (!res) {
                 await new Promise(_resolve => {
                     _demux.once("drain", () => {
-                        _resolve();
+                        _resolve(null);
                         expect(_demux._writableState.length).to.be.equal(0);
                         t.pass();
                     });
@@ -683,13 +679,7 @@ test.cb("Demux should send data events", t => {
 });
 
 test.cb("demux() `finish` and `end` propagates", t => {
-    interface Chunk {
+    t.plan(10);
-        key: string;
-        mapped: number[];
-    }
-
-    t.plan(9);
-
     const construct = (destKey: string) => {
         const dest = map((chunk: any) => {
             chunk.mapped.push(destKey);
@@ -728,10 +718,10 @@ test.cb("demux() `finish` and `end` propagates", t => {
     });
     _demux.on("end", () => {
         t.pass();
-        t.end();
     });
     sink.on("finish", () => {
         t.pass();
+        t.end();
     });
 
     const input = [