[p-forever] Add types

types/p-forever/index.d.ts

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+// Type definitions for p-forever 1.0
+// Project: https://github.com/sindresorhus/p-forever#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.7
+
+export = pForever;
+
+declare function pForever<T>(
+    fn: (previousValue?: T) => T | PromiseLike<T> | typeof pForever.end
+): Promise<void>;
+declare function pForever<T>(
+    fn: (previousValue: T) => T | PromiseLike<T> | typeof pForever.end,
+    initialValue: T
+): Promise<void>;
+
+declare namespace pForever {
+    const end: unique symbol;
+}

types/p-forever/p-forever-tests.ts

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+import pForever = require('p-forever');
+
+// $ExpectType Promise<void>
+pForever(i => {
+    // $ExpectType number
+    i;
+    i++;
+    return i <= 100 ? i : pForever.end;
+}, 0);
+// $ExpectType Promise<void>
+pForever(i => {
+    // $ExpectType number
+    i;
+    i++;
+    return i <= 100 ? Promise.resolve(i) : pForever.end;
+}, 0);
+
+let i = 0;
+
+// $ExpectType Promise<void>
+pForever<number>(prevI => {
+    // $ExpectType number | undefined
+    prevI;
+    i++;
+    return i <= 100 ? i : pForever.end;
+});
+// $ExpectType Promise<void>
+pForever<number>(prevI => {
+    // $ExpectType number | undefined
+    prevI;
+    i++;
+    return i <= 100 ? Promise.resolve(i) : pForever.end;
+});

types/p-forever/tsconfig.json

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

types/p-forever/tslint.json

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