[find-up] add typings (#18838)

types/find-up/find-up-tests.ts

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+import findUp = require('find-up');
+
+findUp('unicorn.png').then(filepath => {
+    filepath; // $ExpectType string | null
+});
+
+findUp('unicorn.png', {cwd: ''});
+findUp(['rainbow.png', 'unicorn.png']);
+findUp(['rainbow.png', 'unicorn.png'], {cwd: ''});
+
+findUp.sync('unicorn.png'); // $ExpectType string | null
+findUp.sync('unicorn.png', {cwd: ''});
+findUp.sync(['rainbow.png', 'unicorn.png']);
+findUp.sync(['rainbow.png', 'unicorn.png'], {cwd: ''});

types/find-up/index.d.ts

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+// Type definitions for find-up 2.1
+// Project: https://github.com/sindresorhus/find-up#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = findUp;
+
+declare function findUp(filename: string | string[], options?: findUp.Options): Promise<string | null>;
+
+declare namespace findUp {
+    function sync(filename: string | string[], options?: findUp.Options): string | null;
+
+    interface Options {
+        cwd?: string;
+    }
+}

types/find-up/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",
+        "find-up-tests.ts"
+    ]
+}

types/find-up/tslint.json

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