[delay] introduce typings (#18526)

types/delay/delay-tests.ts

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+import delay = require('delay');
+
+delay(200)
+    .then(() => {
+    });
+
+let str: string;
+let num: number;
+Promise.resolve(delay(100))
+    .then(() => {
+    });
+
+Promise.resolve("foo")
+    .then(delay<string>(100))
+    .then(result => {
+        str = result;
+    });
+
+Promise.resolve('foo')
+    .then(delay(100, 10))
+    .then(result => {
+        num = result;
+    });
+
+Promise.resolve('foo')
+    .then(delay.reject(100))
+    .then(x => 10)
+    .catch(err => {
+    });
+
+Promise.resolve('foo')
+    .then(delay.reject(100, 'bar'))
+    .then(x => 10)
+    .catch(err => {
+    });
+
+(async () => {
+    const delaying = delay(1000);
+    delaying.cancel();
+    try {
+        await delaying;
+    } catch (err) {
+        // `err` is an instance of `delay.CancelError`
+    }
+})();
+
+throw new delay.CancelError('bar');

types/delay/index.d.ts

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+// Type definitions for delay 2.0
+// Project: https://github.com/sindresorhus/delay#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+export = delay;
+
+declare function delay<T>(ms: number): delay.PDelayedPassThroughThunk<T>;
+declare function delay<T>(ms: number, value: T): delay.PDelayedThunk<T>;
+
+declare namespace delay {
+    function reject(ms: number, rejectionValue?: any): PDelayedThunk<never>;
+
+    class CancelError extends Error {
+        readonly name: 'CancelError';
+        constructor(message?: string);
+    }
+
+    type PDelayedThunk<T> = ((value: any) => DelayedPromiseLike<T>) & DelayedPromiseLike<T>;
+
+    type PDelayedPassThroughThunk<TValue> = ((value: TValue) => DelayedPromiseLike<TValue>) & DelayedPromiseLike<void>;
+
+    interface DelayedPromiseLike<T> {
+        then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null,
+                                             onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;
+        catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
+        cancel(): void;
+    }
+}

types/delay/tsconfig.json

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

types/delay/tslint.json

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