ZETA-6981: Add intial file for adding a varaible statement.

src/rz/typescript/add-variable-statement/add-variable-statement.ts

@@ -0,0 +1,14 @@
+import { VariableDeclarationKind } from "ts-morph";
+import { EditCodeBlockInput } from "../interfaces/edit-typescript.interface";
+
+// right now assumes all methods will be private
+export function addVariableDeclarationStatement(editCodeBlockInput: EditCodeBlockInput): void {
+  const sourceFile = editCodeBlockInput.sourceFile;
+  sourceFile.insertVariableStatement(0, {
+    declarationKind: VariableDeclarationKind.Const,
+    declarations: [{
+      name: editCodeBlockInput.name as string,
+      initializer: editCodeBlockInput.codeBlock
+    }]
+  });
+}