Add types for handlebars-helpers (#30620)

types/handlebars-helpers/handlebars-helpers-tests.ts

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+import * as Handlebars from 'handlebars';
+import * as helpers from 'handlebars-helpers';
+
+const handlebars = Handlebars.create();
+
+helpers();
+helpers('helper');
+helpers(['helper']);
+helpers({handlebars});
+helpers('helper', {handlebars});
+helpers(['helper'], {handlebars});

types/handlebars-helpers/index.d.ts

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+// Type definitions for handlebars-helpers 0.5
+// Project: http://assemble.io/helpers/
+// Definitions by: Toilal <https://github.com/Toilal>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as Handlebars from 'handlebars';
+
+declare function helpers(groups?: helpers.Options | string | string[], options?: helpers.Options): { [name: string]: Handlebars.HelperDelegate };
+
+interface Utils {
+    /**
+     * Returns true if the given value contains the given
+     * `object`, optionally passing a starting index.
+     */
+    contains<T>(val: T[], obj: T, start: number): boolean;
+
+    /**
+     * Remove leading and trailing whitespace and non-word
+     * characters from the given string.
+     */
+    chop(str: string): string;
+
+    /**
+     * Change casing on the given `string`, optionally
+     * passing a delimiter to use between words in the
+     * returned string.
+     *
+     * ```handlebars
+     * utils.changecase('fooBarBaz');
+     * //=> 'foo bar baz'
+     *
+     * utils.changecase('fooBarBaz' '-');
+     * //=> 'foo-bar-baz'
+     * ```
+     */
+    changecase(str: string, fn: (str: string) => string): string;
+}
+
+declare namespace helpers {
+    interface Options {
+        handlebars?: typeof Handlebars;
+        hbs?: typeof Handlebars;
+    }
+
+    const utils: Utils;
+}
+
+export = helpers;

types/handlebars-helpers/tsconfig.json

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

types/handlebars-helpers/tslint.json

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