Add types for concurrently (#38580)

types/concurrently/concurrently-tests.ts

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+import * as concurrently from 'concurrently';
+
+concurrently(['echo foo']); // $ExpectType Promise<null>
+// $ExpectType Promise<null>
+concurrently(
+    [
+        'echo foo',
+        {
+            command: 'echo bar',
+            name: 'bar',
+            prefixColor: 'yellow',
+        },
+    ],
+    {
+        prefix: 'foo',
+        killOthers: ['success'],
+    },
+);
+
+concurrently('foo'); // $ExpectError

types/concurrently/index.d.ts

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+// Type definitions for concurrently 4.1
+// Project: https://github.com/kimmobrunfeldt/concurrently#readme
+// Definitions by: Michael B. <https://github.com/Blasz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+export = concurrently;
+
+declare function concurrently(
+    commands: Array<concurrently.CommandObj | string>,
+    options?: concurrently.Options,
+): Promise<null>;
+
+declare namespace concurrently {
+    interface CommandObj {
+        command: string;
+        name?: string;
+        prefixColor?: string;
+    }
+    interface Options {
+        defaultInputTarget?: number;
+        inputStream?: NodeJS.ReadableStream;
+        killOthers?: Array<'success' | 'failure'>;
+        outputStream?: NodeJS.WritableStream;
+        prefix?: 'index' | 'pid' | 'time' | 'command' | 'name' | 'none' | string;
+        prefixLength?: number;
+        raw?: boolean;
+        restartTries?: number;
+        restartDelay?: number;
+        successCondition?: 'first' | 'last';
+        timestampFormat?: string;
+    }
+}

types/concurrently/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "concurrently-tests.ts"
+    ]
+}

types/concurrently/tslint.json

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+{ "extends": "dtslint/dt.json" }