[file-exists] add typings (#18926)

types/file-exists/file-exists-tests.ts

@@ -0,0 +1,15 @@
+import fileExists = require('file-exists');
+
+fileExists('/index.html', (err, exists) => {
+    err; // $ExpectType Error | null
+    exists; // $ExpectType boolean
+});
+
+fileExists('/index.html', {root: ''}, (err, exists) => {
+    err; // $ExpectType Error | null
+    exists; // $ExpectType boolean
+});
+
+// $ExpectType boolean
+fileExists.sync('/index.html');
+fileExists.sync('/index.html', {root: ''});

types/file-exists/index.d.ts

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+// Type definitions for file-exists 4.0
+// Project: https://github.com/scottcorgan/file-exists
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = fileExists;
+
+declare function fileExists(filepath: string, callback?: (err: Error | null, exists: boolean) => void): void;
+declare function fileExists(filepath: string, options?: fileExists.Options, callback?: (err: Error | null, exists: boolean) => void): void;
+
+declare namespace fileExists {
+    function sync(filepath: string, options?: Options): boolean;
+
+    interface Options {
+        root?: string;
+    }
+}

types/file-exists/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",
+        "file-exists-tests.ts"
+    ]
+}

types/file-exists/tslint.json

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