New-Types: add types for Opossum (#29637)

types/opossum/index.d.ts

@@ -0,0 +1,34 @@
+// Type definitions for opossum 1.8
+// Project: https://github.com/bucharest-gold/opossum
+// Definitions by: Quinn Langille <https://github.com/quinnlangille>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+/// <reference types="node"/>
+import * as stream from "stream";
+
+export type Action = () => any;
+
+export class CircuitBreaker {
+    promisify(action: Action): Promise<Action>;
+    stats(): stream.Transform;
+}
+
+export interface CircuitBreakerOptions {
+    timeout?: number;
+    maxFailures?: number;
+    resetTimeout?: number;
+    rollingCountTimeout?: number;
+    rollingCountBuckets?: number;
+    name?: string;
+    rollingPercentilesEnabled?: boolean;
+    capacity?: number;
+    errorThresholdPercentage?: number;
+    enabled?: boolean;
+    allowWarmUp?: boolean;
+}
+
+export default function circuitBreaker(
+    action: Action,
+    options?: CircuitBreakerOptions
+): CircuitBreaker;

types/opossum/opossum-tests.ts

@@ -0,0 +1,24 @@
+import { Transform } from "stream";
+import circuitBreaker, { CircuitBreaker, CircuitBreakerOptions } from "opossum";
+
+const _blank = () => {};
+
+const testNoOptions: CircuitBreaker = circuitBreaker(_blank);
+
+const options: CircuitBreakerOptions = {
+    timeout: 1,
+    maxFailures: 1,
+    resetTimeout: 1,
+    rollingCountTimeout: 1,
+    rollingCountBuckets: 1,
+    name: "testing",
+    rollingPercentilesEnabled: true,
+    capacity: 1,
+    errorThresholdPercentage: 1,
+    enabled: true,
+    allowWarmUp: true
+};
+
+const testWithOptions: CircuitBreaker = circuitBreaker(_blank, options);
+const shouldBeAPromise: Promise<any> = testWithOptions.promisify(_blank);
+const shouldBeATransformStream: Transform = testWithOptions.stats();

types/opossum/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "opossum-tests.ts"
+    ]
+}

types/opossum/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }