Getting all imported modules names from a JS file using TypeScript parser

getAllImports.ts

import { readFileSync } from 'fs';
import { builtinModules } from 'module';

import ts from 'typescript'; 

const tsHost = ts.createCompilerHost(
    {
      allowJs: true,
      noEmit: true,
      isolatedModules: true,
      resolveJsonModule: false,
      moduleResolution: ts.ModuleResolutionKind.Classic, // we don't want node_modules
      incremental: true,
      noLib: true,
      noResolve: true,
    },
    true,
  );

function getImports(fileName: string): readonly string[] {
    const sourceFile = tsHost.getSourceFile(
      fileName,
      ts.ScriptTarget.Latest,
      (msg) => {
        throw new Error(`Failed to parse ${fileName}: ${msg}`);
      },
    );
    if (!sourceFile) throw ReferenceError(`Failed to find file ${fileName}`);
    const importing: string[] = [];
    delintNode(sourceFile);
    return {
      importing,
    };

    function delintNode(node: ts.Node) {
      if (ts.isImportDeclaration(node)) {
        const moduleName = node.moduleSpecifier.getText().replace(/['"]/g, '');
        if (
          !moduleName.startsWith('node:') &&
          !builtinModules.includes(moduleName)
        )
          importing.push(moduleName);
      } else ts.forEachChild(node, delintNode);
    }
}