fix: shared default lexer state by cloning effective options during lexer construction

[codefix-patchflow]

What failed

Describe the bug import { marked } from "marked"; const lexer = new marked.Lexer(); const tokensA = marked.Lexer.lex("Test"); const tokensB = lexer.lex("Test"); The values of tokensA and tokensB should be the same instead tokensA is [ { "type": "paragraph", "raw": "Test", "text": "Test", "tokens": [ { "type": "text", "raw": "Test", "text": "Test", "escaped": false } ] } ] as expected but tokensB is [ { "type": "paragraph", "raw": "Test", "text": "Test", "tokens": [] } ] The problem is probably related to the shared defaults option object To Reproduce Steps to reproduce the behavior: Run the code above Expected behavior I would expect both options to give the same result

What changed

Fixed shared default lexer state by cloning effective options during lexer construction

• src/Lexer.ts around line 24 (modified, +1/-1)

Why this works

The patch is scoped to the failing path and preserves existing behavior outside the touched code.

Expected result

A concise pull request is created with a clear review note

Patchflow did not run repository-local commands; the automated review gate checks the patch without assuming the project full runtime environment is available.

🔧 Fixed automatically by Patchflow — $1/fix · no fix, no fee

Automation details

• Job ID: c312b1cb-63a3-4e53-b3ef-0bd158116bc2
• Repository: CDEN190/marked
• Branch: codefix/c312b1cb-describe-the-bug
• Base branch: master
• Reference command: None
• Review gate: automated static review; repository-local commands were not executed.