feat(function): add local data conversion APIs

[waleedlatif1]

Summary

• Add isolate-local Buffer, base64, and text encoding APIs without changing runtime routing or limits.
• Include worker packaging, documentation, and regression coverage.

Type of Change

• Feature

Testing

1,093 runtime tests passed; type-check, lint, and all 46 audits passed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 10, 2026 9:55am UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; no actionable new issues or outstanding previous findings remain.

Summary

• Provides Buffer, atob, btoa, TextEncoder, and TextDecoder through a generated isolate-safe bundle.
• Packages and initializes the bundle in the isolated worker while preserving execution isolation, timeout enforcement, and memory accounting.
• Adds bundle-level and real-worker regression coverage.
• Updates Function block guidance and user documentation.
• Changes generated bundle banners to TSDoc, fully addressing the remaining previous review finding.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Function block JavaScript] --> B{Imports, mounted files,<br/>or selected sandbox?}
    B -->|Yes| C[Remote sandbox]
    B -->|No| D[Fresh local V8 isolate]
    D --> E[Load Function globals bundle]
    E --> F[Buffer]
    E --> G[atob / btoa]
    E --> H[TextEncoder / TextDecoder]
    F --> I[Execute user code]
    G --> I
    H --> I

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[waleedlatif1]

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