Type for Signalfx package (#38638)

* added signalfx

* fixed test errors

* fixed test errors

types/signalfx/index.d.ts

@@ -0,0 +1,53 @@
+// Type definitions for signalfx 7.0
+// Project: https://github.com/signalfx/signalfx-nodejs
+// Definitions by: Vladimir Grenaderov <https://github.com/VladimirGrenaderov>
+//                 Max Boguslavskiy <https://github.com/maxbogus>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+export interface IngestOptions {
+    enableAmazonUniqueId?: boolean;
+    dimensions?: object;
+    ingestEndpoint?: string;
+    timeout?: number;
+    batchSize?: number;
+    userAgents?: string[];
+    proxy?: string;
+}
+
+export interface SignalMetric {
+    metric: string;
+    value: number;
+    timestamp?: number;
+}
+
+export interface SignalReport {
+    cumulative_counters?: SignalMetric[];
+    gauges?: SignalMetric[];
+    counters?: SignalMetric[];
+}
+
+export interface SignalClient {
+    send(report: SignalReport): void;
+}
+
+export class Ingest {
+    constructor(token: string, options?: IngestOptions);
+    send(report: SignalReport): void;
+}
+
+export class IngestJson {
+    constructor(token: string, options?: IngestOptions);
+    send(report: SignalReport): void;
+}
+
+export const CONSTANTS: {
+    MESSAGE_TYPES: {
+        CONTROL: string;
+        DATA: string;
+        EVENT: string;
+        METADATA: string;
+    };
+};
+
+export function SignalFlow(apiToken: any, options: any): any;

types/signalfx/signalfx-tests.ts

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+import * as signalfx from 'signalfx';
+
+const sgnlfx = new signalfx.Ingest('1');
+sgnlfx.send({});

types/signalfx/tsconfig.json

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

types/signalfx/tslint.json

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