vercel/ncc

TypeError with BigInt data types

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#1,307 opened on Feb 20, 2026

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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

Research direction
Inspect the source code of ncc's relocate loader to find where BigInt operations are performed without proper type checking. Look for BinaryExpression handling that might be mixing BigInt with other types.
Tech stack
javascriptnodejs
Domain
cli
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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.
Clear
Prerequisites
Node.js
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60