added types for express-status-monitor (#38977)

types/express-status-monitor/express-status-monitor-tests.ts

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+import express = require('express');
+import expressStatusMonitor = require('express-status-monitor');
+import socketIO = require('socket.io');
+
+const app = express();
+app.use(expressStatusMonitor());
+app.use(
+    expressStatusMonitor({
+        title: 'Type Test',
+        theme: 'default.css',
+        path: '/status',
+        socketPath: '/socket.io',
+        websocket: null,
+        chartVisibility: {
+            cpu: true,
+            mem: false,
+            load: true,
+        },
+        ignoreStartsWith: '/admin',
+        healthChecks: [],
+    }),
+);
+app.use(
+    expressStatusMonitor({
+        spans: [{ interval: 10000, retention: 60 * 1000 }],
+        healthChecks: [
+            {
+                protocol: 'http',
+                host: 'localhost',
+                path: '/healthcheck',
+                port: '4000',
+            },
+        ],
+    }),
+);
+
+const io = socketIO.listen(80);
+
+app.use(
+    expressStatusMonitor({
+        websocket: io,
+    }),
+);

types/express-status-monitor/index.d.ts

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+// Type definitions for express-status-monitor 1.2
+// Project: https://github.com/RafalWilinski/express-status-monitor#readme
+// Definitions by: Alex Anderson <https://github.com/me>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+/// <reference types="socket.io" />
+
+import express = require('express');
+
+declare namespace e {
+    interface ExpressStatusMonitorConfig {
+        title?: string;
+        theme?: string;
+        path?: string;
+        socketPath?: string;
+        websocket?: SocketIO.Server | null; // References a socket.io instance
+        spans?: RetentionSpan[];
+        chartVisibility?: {
+            cpu?: boolean;
+            mem?: boolean;
+            load?: boolean;
+            responseTime?: boolean;
+            rps?: boolean;
+            statusCodes?: boolean;
+        };
+        healthChecks?: HealthCheck[];
+        ignoreStartsWith?: string;
+    }
+
+    interface RetentionSpan {
+        interval: number;
+        retention: number;
+    }
+    interface HealthCheck {
+        protocol: string;
+        host: string;
+        path: string;
+        port: string | number;
+    }
+}
+
+declare function e(config?: e.ExpressStatusMonitorConfig): express.RequestHandler;
+
+export = e;

types/express-status-monitor/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",
+        "express-status-monitor-tests.ts"
+    ]
+}

types/express-status-monitor/tslint.json

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