diff --git a/cli.ts b/cli.ts
index 480e828..42c6a61 100644
--- a/cli.ts
+++ b/cli.ts
@@ -25,16 +25,15 @@ const fsMap = await createDefaultMapFromCDN(
   ts as any,
   lzstring,
 );
-const system = createSystem(fsMap);
 
 filePaths.forEach((filePath) => {
   fsMap.set(filePath, Deno.readTextFileSync(filePath));
 });
 
 const program = ts.createProgram({
-  rootNames: filePaths,
+  rootNames: [...filePaths, "/lib.es2020.full.d.ts"],
   options: compilerOptions,
-  host: makeHostOption(system, compilerOptions),
+  host: makeHostOption(fsMap, compilerOptions),
 });
 
 const inspection = inspect(program);
diff --git a/helper/_option.ts b/helper/_option.ts
index b28cf1f..550af60 100644
--- a/helper/_option.ts
+++ b/helper/_option.ts
@@ -1,12 +1,13 @@
-import type { CompilerHost, CompilerOptions, System } from "../deps.ts";
-import { createVirtualCompilerHost, ts } from "../deps.ts";
+import type { CompilerHost, CompilerOptions } from "../deps.ts";
+import { createSystem, createVirtualCompilerHost, ts } from "../deps.ts";
 
 /** make `createProgram` option */
 function makeCompilerOption(): CompilerOptions {
   return {
-    strict: true,
-    module: ts.ModuleKind.ESNext,
     esModuleInterop: true,
+    module: ts.ModuleKind.ESNext,
+    target: ts.ScriptTarget.ESNext,
+    lib: ["dom", "esnext"],
     skipLibCheck: false,
     noEmit: true,
   };
@@ -14,11 +15,24 @@ function makeCompilerOption(): CompilerOptions {
 
 /** make `createProgram` host option */
 function makeHostOption(
-  system: System,
+  fs: Map<string, string>,
   compilerOptions: CompilerOptions,
 ): CompilerHost {
-  const host = createVirtualCompilerHost(system, compilerOptions, ts as any);
-  return host.compilerHost;
+  const system = createSystem(fs);
+  const { compilerHost } = createVirtualCompilerHost(
+    system,
+    compilerOptions,
+    ts as any,
+  );
+
+  compilerHost.getSourceFile = (fileName, lang) => {
+    const sourceText = fs.get(fileName);
+    if (sourceText) {
+      return ts.createSourceFile(fileName, sourceText, lang);
+    }
+  };
+
+  return compilerHost;
 
   // return {
   //   readFile: (fileName) => {
diff --git a/matcher/mod.ts b/matcher/mod.ts
index 9196a22..ea340fc 100644
--- a/matcher/mod.ts
+++ b/matcher/mod.ts
@@ -12,11 +12,8 @@ import type { Matcher } from "./types.ts";
 import type { RequiredByKeys } from "../_types.ts";
 
 const ImportPathWithExtension = 2691;
-// temporary
-const IgnoreArrayLength = 2536;
 const IgnoreDiagnosticCodes = new Set([
   ImportPathWithExtension,
-  IgnoreArrayLength,
 ]);
 
 const assertionMap = {