master

.eslintrc

@@ -0,0 +1,13 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["prettier"],
+  "extends": [
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "parserOptions": { "ecmaVersion": 2021, "sourceType": "module" },
+  "rules": {
+    "@typescript-eslint/no-var-requires": 0,
+    "prettier/prettier": "error"
+  }
+}

.gitignore

@@ -29,3 +29,5 @@ java/rest/rest.iml
 **/.idea/
 **/target/
 **/*.iml
+
+text?.txt

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": true,
+  "printWidth": 120,
+  "tabWidth": 2
+}

cloneReadableStream.ts

@@ -0,0 +1,28 @@
+import { Readable, ReadableOptions } from 'stream';
+
+class ReadableStreamClone extends Readable {
+  constructor(readableStream: Readable, options?: ReadableOptions) {
+    super(options);
+
+    readableStream.on('data', (chunk) => {
+      this.push(chunk);
+    });
+
+    readableStream.on('end', () => {
+      this.push(null);
+    });
+
+    readableStream.on('error', (err) => {
+      this.emit('error', err);
+    });
+
+    readableStream.on('error', (err) => {
+      this.emit('error', err);
+    });
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  _read() {}
+}
+
+module.exports = ReadableStreamClone;

package.json

@@ -14,7 +14,11 @@
         "typescript",
         "types"
     ],
-    "scripts": {},
+    "scripts": {
+        "test": "ts-node test.cloneReadableStream.ts",
+        "lint": "eslint cloneRead.ts",
+        "format": "eslint cloneRead.ts --fix"
+    },
     "maintainers": [
         {
             "name": "levansuper",
@@ -26,6 +30,14 @@
         "url": "[email protected]:levansuper/readable-stream-clone.git"
     },
     "devDependencies": {
-        "@types/node": "^13.9.3"
+        "@typescript-eslint/eslint-plugin": "^4.18.0",
+        "@typescript-eslint/parser": "^4.18.0",
+        "eslint": "^7.22.0",
+        "eslint-config-prettier": "^8.1.0",
+        "eslint-plugin-prettier": "^3.3.1",
+        "prettier": "^2.2.1",
+        "@types/node": "^14.14.35",
+        "ts-node": "^9.1.1",
+        "typescript": "^4.2.3"
     }
 }

test.cloneReadableStream.ts

@@ -0,0 +1,16 @@
+import * as fs from 'fs';
+const ReadableStreamClone = require('./cloneReadableStream');
+
+const readStream = fs.createReadStream('text.txt', { highWaterMark: 3 });
+
+// for test purposes I'm restrict internal buffer threshold  to 3 byte
+const readClone1 = new ReadableStreamClone(readStream, { highWaterMark: 3 });
+const readClone2 = new ReadableStreamClone(readStream, { highWaterMark: 3 });
+
+const writeStream1 = fs.createWriteStream('text1.txt');
+const writeStream2 = fs.createWriteStream('text2.txt');
+
+readClone1.pipe(writeStream1);
+readClone2.pipe(writeStream2);
+
+console.log('File test.txt was copied - OK.');

text.txt

@@ -0,0 +1,33 @@
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes
+Example text file for test purposes

tsconfig.json

@@ -1,63 +1,11 @@
 {
-  "compilerOptions": {
-    /* Basic Options */
-    // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    // "lib": [],                             /* Specify library files to be included in the compilation. */
-    // "allowJs": true,                       /* Allow javascript files to be compiled. */
-    // "checkJs": true,                       /* Report errors in .js files. */
-    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
-    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
-    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
-    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
-    // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    // "outDir": "./",                        /* Redirect output structure to the directory. */
-    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-    // "composite": true,                     /* Enable project compilation */
-    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
-    // "removeComments": true,                /* Do not emit comments to output. */
-    // "noEmit": true,                        /* Do not emit outputs. */
-    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
-    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
-    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
-
-    /* Strict Type-Checking Options */
-    "strict": true,                           /* Enable all strict type-checking options. */
-    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
-    // "strictNullChecks": true,              /* Enable strict null checks. */
-    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
-    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
-    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
-    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
-    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
-
-    /* Additional Checks */
-    // "noUnusedLocals": true,                /* Report errors on unused locals. */
-    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
-    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
-    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
-
-    /* Module Resolution Options */
-    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
-    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
-    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
-    // "typeRoots": [],                       /* List of folders to include type definitions from. */
-    // "types": [],                           /* Type declaration files to be included in compilation. */
-    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
-    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
-
-    /* Source Map Options */
-    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
-    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
-    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
-    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
-
-    /* Experimental Options */
-    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
-    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
-  }
-}
+  "compilerOptions":
+  {
+    "target": "es2020",
+    "module": "commonjs",
+    "esModuleInterop": true,
+    "moduleResolution": "node"
+  },
+  "include": ["*.ts"],
+  "exclude": ["node_modules"],
+}