Add "Handlebars.VM.resolvePartial" to type definitions

- Handlebars.VM is actually not part of the API,
  but Handlebars.VM.resolvePartial is mentioned
  in the documentation and is thus now treated
  as part of the API.

Closes #1534

Author: AndrewLeedham

lib/handlebars/runtime.js

@@ -209,6 +209,9 @@ export function wrapProgram(container, i, fn, data, declaredBlockParams, blockPa
   return prog;
 }
 
+/**
+ * This is currently part of the official API, therefore implementation details should not be changed.
+ */
 export function resolvePartial(partial, context, options) {
   if (!partial) {
     if (options.name === '@partial-block') {

types/index.d.ts

@@ -7,6 +7,7 @@
  *   - Raanan Weber <https://github.com/RaananW>
  *   - Sergei Dorogin <https://github.com/evil-shrike>
  *   - webbiesdk <https://github.com/webbiesdk>
+ *   - Andrew Leedham <https://github.com/AndrewLeedham>
  * For full history prior to their migration to handlebars.js, please see:
  * https://github.com/DefinitelyTyped/DefinitelyTyped/commits/1ce60bdc07f10e0b076778c6c953271c072bc894/types/handlebars/index.d.ts
  */
@@ -20,6 +21,7 @@ declare namespace Handlebars {
   export type Template<T = any> = TemplateDelegate<T>|string;
 
   export interface RuntimeOptions {
+      name?: string;
       partial?: boolean;
       depths?: any[];
       helpers?: { [name: string]: Function };
@@ -147,6 +149,13 @@ declare namespace Handlebars {
       NullLiteral(): void;
       Hash(hash: hbs.AST.Hash): void;
   }
+
+  export namespace VM {
+    /**
+     * @deprecated
+     */
+    export function resolvePartial<T = any>(partial: HandlebarsTemplateDelegate<T> | undefined, context: any, options: RuntimeOptions): HandlebarsTemplateDelegate<T>;
+  }
 }
 
 /**
@@ -223,6 +232,8 @@ interface Logger {
   log(level: number, obj: string): void;
 }
 
+type CompilerInfo = [number/* revision */, string /* versions */];
+
 declare namespace hbs {
   namespace AST {
       interface Node {

types/test.ts

@@ -90,6 +90,16 @@ const parsedTmpl = Handlebars.parse('<p>Hello, my name is {{name}}.</p>', {
 
 const parsedTmplWithoutOptions = Handlebars.parse('<p>Hello, my name is {{name}}.</p>');
 
+// Custom partial resolution.
+const originalResolvePartial = Handlebars.VM.resolvePartial;
+Handlebars.VM.resolvePartial = <T>(partial: HandlebarsTemplateDelegate<T> | undefined, context: any, options: RuntimeOptions): HandlebarsTemplateDelegate<T> => {
+  const name = options.name;
+  // transform name.
+  options.name = name;
+  return originalResolvePartial(partial, context, options);
+}
+
+
 // #1544, allow custom helpers in knownHelpers
 Handlebars.compile('test', {
   knownHelpers: {