Add __debug apis to cjs version (#13731)

src/index.cjs

@@ -15,11 +15,29 @@ const functionNames = [
 
 const prettier = Object.create(null);
 for (const name of functionNames) {
-  prettier[name] = function (...args) {
-    return prettierPromise.then((prettier) => prettier[name](...args));
+  prettier[name] = async (...args) => {
+    const prettier = await prettierPromise;
+    return prettier[name](...args);
   };
 }
 
+const debugApiFunctionNames = [
+  "parse",
+  "formatAST",
+  "formatDoc",
+  "printToDoc",
+  "printDocToString",
+];
+
+const debugApis = Object.create(null);
+for (const name of debugApiFunctionNames) {
+  debugApis[name] = async (...args) => {
+    const prettier = await prettierPromise;
+    return prettier.__debug[name](...args);
+  };
+}
+prettier.__debug = debugApis;
+
 if (process.env.NODE_ENV === "production") {
   prettier.util = require("./common/util-shared.js");
   prettier.doc = require("./document/index.js");

tests/integration/__tests__/bundle.js

@@ -3,6 +3,7 @@ import path from "node:path";
 import createEsmUtils from "esm-utils";
 import fastGlob from "fast-glob";
 import { projectRoot } from "../env.js";
+import prettier from "../../config/prettier-entry.js";
 import createSandBox from "../../config/utils/create-sandbox.cjs";
 import * as coreOptions from "../../../src/main/core-options.js";
 import codeSamples from "../../../website/playground/codeSamples.mjs";
@@ -95,3 +96,34 @@ test("global objects", async () => {
     expect(globalObjects).toStrictEqual({});
   }
 });
+
+test("Commonjs version", () => {
+  const prettierCommonjsVersion = require(path.join(
+    distDirectory,
+    "index.cjs"
+  ));
+
+  expect(Object.keys(prettierCommonjsVersion).sort()).toEqual(
+    Object.keys(prettier)
+      .filter((key) => key !== "__internal")
+      .sort()
+  );
+  expect(typeof prettierCommonjsVersion.format).toBe("function");
+
+  expect(Object.keys(prettierCommonjsVersion.doc)).toEqual(
+    Object.keys(prettier.doc)
+  );
+  expect(typeof prettierCommonjsVersion.doc.builders.fill).toBe("function");
+
+  expect(Object.keys(prettierCommonjsVersion.util)).toEqual(
+    Object.keys(prettier.util)
+  );
+  expect(typeof prettierCommonjsVersion.util.getStringWidth).toBe("function");
+
+  expect(Object.keys(prettierCommonjsVersion.__debug).sort()).toEqual(
+    Object.keys(prettier.__debug).sort()
+  );
+  expect(typeof prettierCommonjsVersion.__debug.parse).toBe("function");
+
+  expect(prettierCommonjsVersion.version).toBe(prettier.version);
+});