Remove prettier from babel-plugin as dependency

We can now fully remove prettier from babel-plugin-react-forget. I moved it to 
devDependencies instead, to make the rollup build simpler and so we can continue 
to prettify our internal source code.

compiler/packages/babel-plugin-react-forget/package.json

@@ -31,7 +31,6 @@
     "@babel/types": "^7.19.0",
     "chalk": "4",
     "invariant": "^2.2.4",
-    "prettier": "2.8.8",
     "pretty-format": "^24"
   },
   "devDependencies": {
@@ -60,6 +59,7 @@
     "hermes-parser": "^0.15.1",
     "jest": "^29.0.3",
     "jest-environment-jsdom": "^29.0.3",
+    "prettier": "2.8.8",
     "react": "^0.0.0-experimental-493f72b0a-20230727",
     "react-dom": "^0.0.0-experimental-493f72b0a-20230727",
     "rimraf": "^3.0.2",

compiler/packages/babel-plugin-react-forget/src/Babel/RunReactForgetBabelPlugin.ts

@@ -10,23 +10,16 @@ import { transformFromAstSync } from "@babel/core";
 import * as BabelParser from "@babel/parser";
 import * as HermesParser from "hermes-parser";
 import invariant from "invariant";
-import prettier from "prettier";
 import type { PluginOptions } from "../Entrypoint";
 import ReactForgetBabelPlugin from "./BabelPlugin";
 
-type ReactForgetBabelPluginResult = {
-  ast: BabelCore.BabelFileResult["ast"];
-  code: string;
-  map: BabelCore.BabelFileResult["map"];
-};
-
 export function runReactForgetBabelPlugin(
   text: string,
   file: string,
   language: "flow" | "typescript",
   options: PluginOptions | null,
   includeAst: boolean = false
-): ReactForgetBabelPluginResult {
+): BabelCore.BabelFileResult {
   let ast;
   if (language === "flow") {
     ast = HermesParser.parse(text, {
@@ -59,12 +52,5 @@ export function runReactForgetBabelPlugin(
     result?.code != null,
     `Expected BabelPluginReactForget to codegen successfully, got: ${result}`
   );
-  return {
-    ast: result.ast,
-    code: prettier.format(result.code, {
-      semi: true,
-      parser: language === "typescript" ? "babel-ts" : "flow",
-    }),
-    map: result.map,
-  };
+  return result;
 }

compiler/packages/fixture-test-utils/src/compiler-utils.ts

@@ -110,9 +110,12 @@ export function transformFixtureInput(
 
   return {
     ...result,
-    code: prettier.format(result.code, {
-      semi: true,
-      parser: language === "typescript" ? "babel-ts" : "flow",
-    }),
+    code:
+      result.code != null
+        ? prettier.format(result.code, {
+            semi: true,
+            parser: language === "typescript" ? "babel-ts" : "flow",
+          })
+        : result.code,
   };
 }

compiler/packages/snap/src/compiler-worker.ts

@@ -88,12 +88,13 @@ export async function compile(
     // since console log order is non-deterministic
     const shouldLogPragma = input.split("\n")[0].includes("@debug");
     toggleLogging(isOnlyFixture && (shouldLogPragma || implicitDebugMode));
-    code = transformFixtureInput(
-      input,
-      basename,
-      runReactForgetBabelPlugin,
-      parseConfigPragma
-    ).code;
+    code =
+      transformFixtureInput(
+        input,
+        basename,
+        runReactForgetBabelPlugin,
+        parseConfigPragma
+      ).code ?? null;
   } catch (e) {
     e.message = e.message.replace(/\u001b[^m]*m/g, "");
     error = e;

compiler/packages/sprout/src/runner-worker.ts

@@ -13,13 +13,13 @@ import type { parseConfigPragma as ParseConfigPragma } from "babel-plugin-react-
 import {
   COMPILER_PATH,
   PARSE_CONFIG_PRAGMA_PATH,
-  parseLanguage,
   TestFixture,
+  parseLanguage,
   transformFixtureInput,
 } from "fixture-test-utils";
 import fs from "fs/promises";
 import path from "path";
-import { doEval, EvaluatorResult } from "./runner-evaluator";
+import { EvaluatorResult, doEval } from "./runner-evaluator";
 
 const { runReactForgetBabelPlugin } = require(COMPILER_PATH) as {
   runReactForgetBabelPlugin: typeof RunReactForgetBabelPlugin;
@@ -135,6 +135,13 @@ function transformFixtureForget(
       };
     }
 
+    if (forgetResult.code == null) {
+      return {
+        type: "UnexpectedError",
+        value: "Unexpected - no code emitted",
+      };
+    }
+
     const code = transformAST(
       forgetResult.ast,
       forgetResult.code,