vercel/ncc

TypeError with BigInt data types

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#1307 opened on Feb 20, 2026

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help wanted

Description

For packages that use BigInt, ncc build returns a type error:

TypeError: Cannot mix BigInt and other types, use explicit conversions
    at Object.BinaryExpression (/node_modules/@vercel/ncc/dist/ncc/loaders/relocate-loader.js.cache.js:12:106322)

Error was encountered when building a project that references dd-trace@5.87.0

Contributor guide

Tech stack
javascriptnodejs
Domain
build systemtoolingcli
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaScriptNode.js basicsUnderstanding of ncc internalsBigInt type
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55
Research direction
Investigate the error in `relocate loader.js.cache.js` at the line indicated (12:106322) to understand how binary expressions are processed. Check if the code incorrectly assumes number types without handling BigInt. Look for existing tests or similar issues in the ncc repository to guide the fix. The solution likely involves adding explicit BigInt type checking before performing arithmetic operations.