From 7f4d62e886a8a100942963cef711e584ceba3031 Mon Sep 17 00:00:00 2001
From: Michael Cousins <michael.cousins@viam.com>
Date: Thu, 17 Apr 2025 11:08:19 -0400
Subject: [PATCH] perf(typescript): strip `projectService` from parser options
 when needed

---
 .changeset/spicy-toes-raise.md         |  5 +++++
 src/parser/converts/root.ts            |  7 ++-----
 src/parser/parser-options.ts           | 23 +++++++++++++++++++++++
 src/parser/typescript/analyze/index.ts | 17 +++++++----------
 4 files changed, 37 insertions(+), 15 deletions(-)
 create mode 100644 .changeset/spicy-toes-raise.md

diff --git a/.changeset/spicy-toes-raise.md b/.changeset/spicy-toes-raise.md
new file mode 100644
index 00000000..533807fa
--- /dev/null
+++ b/.changeset/spicy-toes-raise.md
@@ -0,0 +1,5 @@
+---
+"svelte-eslint-parser": patch
+---
+
+Strip `projectService` from TS options when type information not needed
diff --git a/src/parser/converts/root.ts b/src/parser/converts/root.ts
index 5e5e8de3..81614868 100644
--- a/src/parser/converts/root.ts
+++ b/src/parser/converts/root.ts
@@ -27,6 +27,7 @@ import {
   getOptionsFromRoot,
 } from "../compat.js";
 import { sortNodes } from "../sort.js";
+import { withoutProjectParserOptions } from "../parser-options.js";
 
 /**
  * Convert root
@@ -259,11 +260,7 @@ function convertGenericsAttribute(script: SvelteScriptElement, ctx: Context) {
     result = parseScriptWithoutAnalyzeScope(
       scriptLet,
       ctx.sourceCode.scripts.attrs,
-      {
-        ...ctx.parserOptions,
-        // Without typings
-        project: null,
-      },
+      withoutProjectParserOptions(ctx.parserOptions),
     ) as unknown as TSESParseForESLintResult;
   } catch {
     // ignore
diff --git a/src/parser/parser-options.ts b/src/parser/parser-options.ts
index fd338485..44d43af1 100644
--- a/src/parser/parser-options.ts
+++ b/src/parser/parser-options.ts
@@ -9,6 +9,8 @@ import { getParserForLang, type UserOptionParser } from "./resolve-parser.js";
 export type NormalizedParserOptions = {
   parser?: UserOptionParser;
   project?: string | string[] | null;
+  projectService?: unknown;
+  EXPERIMENTAL_useProjectService?: unknown;
 
   ecmaVersion: number | "latest";
   sourceType: "module" | "script";
@@ -104,3 +106,24 @@ export function isTypeScript(
 
   return false;
 }
+
+/**
+ * Remove typing-related options from parser options.
+ *
+ * Allows the typescript-eslint parser to parse a file without
+ * trying to collect typing information from TypeScript.
+ *
+ * See https://typescript-eslint.io/packages/parser#withoutprojectparseroptionsparseroptions
+ */
+export function withoutProjectParserOptions(
+  options: NormalizedParserOptions,
+): NormalizedParserOptions {
+  const {
+    project: _strippedProject,
+    projectService: _strippedProjectService,
+    EXPERIMENTAL_useProjectService: _strippedExperimentalUseProjectService,
+    ...result
+  } = options;
+
+  return result;
+}
diff --git a/src/parser/typescript/analyze/index.ts b/src/parser/typescript/analyze/index.ts
index 9d784e7a..cea34041 100644
--- a/src/parser/typescript/analyze/index.ts
+++ b/src/parser/typescript/analyze/index.ts
@@ -23,6 +23,7 @@ import type { NormalizedParserOptions } from "../../parser-options.js";
 import { setParent } from "../set-parent.js";
 import { getGlobalsForSvelte, globalsForRunes } from "../../globals.js";
 import type { SvelteParseContext } from "../../svelte-parse-context.js";
+import { withoutProjectParserOptions } from "../../parser-options.js";
 
 export type AnalyzeTypeScriptContext = {
   slots: Set<SvelteHTMLElement>;
@@ -53,11 +54,7 @@ export function analyzeTypeScriptInSvelte(
   const result = parseScriptWithoutAnalyzeScope(
     code.script + code.render + code.rootScope,
     attrs,
-    {
-      ...parserOptions,
-      // Without typings
-      project: null,
-    },
+    withoutProjectParserOptions(parserOptions),
   ) as unknown as TSESParseForESLintResult;
 
   ctx._beforeResult = result;
@@ -118,11 +115,11 @@ export function analyzeTypeScript(
   const ctx = new VirtualTypeScriptContext(code);
   ctx.appendOriginal(/^\s*/u.exec(code)![0].length);
 
-  const result = parseScriptWithoutAnalyzeScope(code, attrs, {
-    ...parserOptions,
-    // Without typings
-    project: null,
-  }) as unknown as TSESParseForESLintResult;
+  const result = parseScriptWithoutAnalyzeScope(
+    code,
+    attrs,
+    withoutProjectParserOptions(parserOptions),
+  ) as unknown as TSESParseForESLintResult;
 
   ctx._beforeResult = result;