improve accuracy by ensuring no truncation of dependencyTree output

[twrichards]

• Ready for review
• Follows CONTRIBUTING rules
• Reviewed by Snyk internal team

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[ghost]

This PR modifies files linked to issues tracked in Stepsize. You might want to review their status, priority, and scope.

Uninitialised variable

• lib/index.ts
• lib/index.ts

Missing error handling

• lib/index.ts

_{Mention [stepsize] in a comment if you'd like to report some technical debt. See examples here.}

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