From 4b3100b43ab9e86bb1bf2cd86a6978b2afef5545 Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Wed, 26 Oct 2022 20:34:47 +0800
Subject: [PATCH] Reduce size of `typescript` plugin (#13734)

---
 scripts/build/modify-typescript-module.mjs | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/scripts/build/modify-typescript-module.mjs b/scripts/build/modify-typescript-module.mjs
index e1d90be3f..9b36300a2 100644
--- a/scripts/build/modify-typescript-module.mjs
+++ b/scripts/build/modify-typescript-module.mjs
@@ -173,6 +173,26 @@ function modifyTypescriptModule(text) {
     })
     .replace("ts.createLanguageService = createLanguageService;", "");
 
+  // `ts.scanner`
+  // This is a big module, most code except `ts.scanner` is not used
+  source.replaceSubmodule(
+    (text) => text.includes("ts.findPackageJson = findPackageJson;"),
+    "ts.scanner = ts.createScanner(99 /* ScriptTarget.Latest */, /*skipTrivia*/ true);"
+  );
+
+  // `ts.visitNode`
+  source.removeSubmodule((text) => text.includes("ts.visitNode = visitNode;"));
+
+  // `ts.createGetSymbolWalker`
+  source.removeSubmodule((text) =>
+    text.includes("ts.createGetSymbolWalker = createGetSymbolWalker;")
+  );
+
+  // `ts.getModuleInstanceState `
+  source.removeSubmodule((text) =>
+    text.includes("ts.getModuleInstanceState = getModuleInstanceState;")
+  );
+
   /* spell-checker: disable */
   // `ts.createParenthesizerRules`
   source
@@ -197,6 +217,12 @@ function modifyTypescriptModule(text) {
       "ts.createNodeConverters = () => ts.nullNodeConverters;"
     );
 
+  // `ts.classifier`
+  source.removeSubmodule((text) => text.includes("classifier = ts.classifier"));
+  source.removeSubmodule((text) =>
+    text.includes("ts.createClassifier = createClassifier;")
+  );
+
   // `ts.getScriptTargetFeatures`
   source
     .replaceAlignedCode({