feat(@power-doctest/javascript): support preTransform options

packages/@power-doctest/javascript/src/power-doctest-runner.ts

@@ -28,6 +28,11 @@ export interface PowerDoctestRunnerOptions {
     // If runMode is any, anyone assertion is finished and resolve it
     // In Both, anyone is failed and reject it
     runMode?: "any" | "all";
+    // transform function
+    // set code => code function if need
+    // Apply this transform before power-doctest transform
+    preTransform?: (code:string) => string;
+    // Internal Option
     powerDoctestCallbackFunctionName?: string;
 }
 
@@ -37,6 +42,7 @@ export function run(code: string, options: PowerDoctestRunnerOptions = {}) {
     const runMode = options.runMode || "all";
     const timeout = options.timeout !== undefined ? options.timeout : 2000;
     const postCallbackName = options.powerDoctestCallbackFunctionName || CALLBACK_FUNCTION_NAME;
+    const preTransform = options.preTransform ? options.preTransform : (code: string) => code;
     const context = options.context || {};
     return new Promise((resolve, reject) => {
         let isSettled = false;
@@ -80,7 +86,7 @@ Also, you should consider to use { "runMode": "any" }` : ""}`));
         };
         process.on("uncaughtException", uncaughtException);
         process.on("unhandledRejection", unhandledRejection as any);
-        const poweredCode = convertCode(code, {
+        const poweredCode = convertCode(preTransform(code), {
             assertAfterCallbackName: postCallbackName
         });
         // total count of assert