feat(pre-suf): new type definition (#43866)

- declaration file
- tests

https://github.com/kaelzhang/node-pre-suf

Thanks!

types/pre-suf/index.d.ts

@@ -0,0 +1,27 @@
+// Type definitions for pre-suf 1.1
+// Project: https://github.com/kaelzhang/node-pre-suf#readme
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Manipulate strings with prefixes and suffixes.
+ */
+
+/**
+ * Ensures that the new string will have prefix at the beginning of str.
+ * If str does not begin with prefix, prefix will be added to the beggining of str.
+ */
+export function ensureLeading(str: string, prefix: string): string;
+/**
+ * Removes the leading prefix of str.
+ */
+export function removeLeading(str: string, prefix: string): string;
+/**
+ * Ensures that the new string will have suffix at the end of str.
+ * If str does not end with suffix, suffix will be added at the end of str.
+ */
+export function ensureEnding(str: string, suffix: string): string;
+/**
+ * Removes the ending suffix of str.
+ */
+export function removeEnding(str: string, suffix: string): string;

types/pre-suf/pre-suf-tests.ts

@@ -0,0 +1,14 @@
+import presuf = require('pre-suf');
+
+presuf.ensureLeading('a', '/'); // $ExpectType string
+presuf.removeLeading('a', '/'); // $ExpectType string
+presuf.ensureEnding('a', '/'); // $ExpectType string
+presuf.removeEnding('/a/ab/a', '/a'); // $ExpectType string
+// $ExpectError
+presuf.ensureLeading();
+// $ExpectError
+presuf.removeLeading();
+// $ExpectError
+presuf.ensureEnding();
+// $ExpectError
+presuf.removeEnding();

types/pre-suf/tsconfig.json

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

types/pre-suf/tslint.json

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