Move CodeGenerator to separate file

Making it clear that the abstraction is designed with purpose.
mtennoe#106

Author: erictuvesson

src/generators/codeGenerator.ts

@@ -0,0 +1,25 @@
+import { CodeGenOptions } from "../options/options";
+import { ViewData } from "../getViewForSwagger2";
+
+/**
+ * Abstraction over a code generator.
+ */
+export interface CodeGenerator {
+  /**
+   * Returns the ViewData from the provided options.
+   *
+   * @param {CodeGenOptions} opts
+   *
+   * @returns {ViewData}
+   */
+  getViewData(opts: CodeGenOptions): ViewData;
+
+  /**
+   * Generate the code from the provided options.
+   *
+   * @param {CodeGenOptions} opts
+   *
+   * @returns {string}
+   */
+  getCode(opts: CodeGenOptions): string;
+}

src/generators/swagger2.ts

@@ -1,11 +1,7 @@
 import { CodeGenOptions } from "../options/options";
 import { transformToCodeWithMustache } from "../transform/transformToCodeWithMustache";
 import { getViewForSwagger2, ViewData } from "../getViewForSwagger2";
-
-interface CodeGenerator {
-  getViewData(opts: CodeGenOptions): ViewData;
-  getCode(opts: CodeGenOptions): string;
-}
+import { CodeGenerator } from "./codeGenerator";
 
 function verifyThatWeAreGeneratingForSwagger2(opts: CodeGenOptions): void {
   if (opts.swagger.swagger !== "2.0") {