dependabit-monitor

name	dependabit-monitor
description	Documentation site for dependabit Use when: Polling a set of tracked dependencies for state changes on a schedule..

@dependabit/monitor

Documentation site for dependabit

When to Use

Use this skill when:

• Polling a set of tracked dependencies for state changes on a schedule. → use Monitor
• Implementing a custom checker for a new access method (e.g., a proprietary API or registry). Register it with Monitor.registerChecker. → use GitHubRepoChecker
• Implementing a custom checker for a new access method (e.g., a proprietary API or registry). Register it with Monitor.registerChecker. → use URLContentChecker
• Implementing a custom checker for a new access method (e.g., a proprietary API or registry). Register it with Monitor.registerChecker. → use OpenAPIChecker

Do NOT use when:

• You only need to check a single dependency type — instantiate the specific checker (e.g., GitHubRepoChecker) directly to avoid loading all built-in checkers.

API surface: 2 functions, 7 classes, 5 types

NEVER

• Concurrent update races: if two Monitor instances watch the same dependency and call updateDependency on the shared manifest file simultaneously, one write will silently overwrite the other. Serialise monitor runs or use a single shared Monitor instance.
• ETag drift false positives: the URLContentChecker hashes the full HTTP response body. Dynamic content (ads, timestamps, CSP nonces) in the response will produce hash changes that are not real dependency updates. Use monitoring.ignoreChanges: true for URLs with high natural churn, or replace them with a more specific checker.
• Clock skew: Scheduler.shouldCheckDependency compares dependency.lastChecked to wall clock time. If the system clock jumps backward (e.g., NTP correction), dependencies may be skipped until the clock catches up to the stored lastChecked timestamp.
• fetch should throw only for unrecoverable errors (network failure, auth error). Temporary 5xx responses should be retried inside the implementation to avoid marking the dependency as errored.
• compare receives the stored previous snapshot and the live current snapshot. Do not assume both snapshots were produced by the same checker version.
• fetch should throw only for unrecoverable errors (network failure, auth error). Temporary 5xx responses should be retried inside the implementation to avoid marking the dependency as errored.
• compare receives the stored previous snapshot and the live current snapshot. Do not assume both snapshots were produced by the same checker version.
• fetch should throw only for unrecoverable errors (network failure, auth error). Temporary 5xx responses should be retried inside the implementation to avoid marking the dependency as errored.
• compare receives the stored previous snapshot and the live current snapshot. Do not assume both snapshots were produced by the same checker version.

Configuration

2 configuration interfaces — see references/config.md for details.

Quick Reference

normalizer: normalizeHTML (Normalizes HTML content for consistent comparison), normalizeURL (Normalizes a URL by removing tracking parameters) Monitor: Monitor (Orchestrates dependency checking across multiple access methods), GitHubRepoChecker (Contract for all dependency checker implementations), URLContentChecker (Contract for all dependency checker implementations), OpenAPIChecker (Contract for all dependency checker implementations), CheckResult (The outcome of a single dependency check performed by Monitor), Checker (Contract for all dependency checker implementations), DependencySnapshot (A point-in-time snapshot of a dependency's state), ChangeDetection (The result of comparing two DependencySnapshot objects) comparator: StateComparator severity: SeverityClassifier, Severity scheduler: Scheduler (Scheduler for per-dependency monitoring

Determines which...)

References

Load these on demand — do NOT read all at once:

• When calling any function → read references/functions.md for full signatures, parameters, and return types
• When using a class → read references/classes/ for properties, methods, and inheritance
• When defining typed variables or function parameters → read references/types.md
• When configuring options → read references/config.md for all settings and defaults

Links

• Author: Pradeep Mouli [e-mail] (https://github.com/pradeepmouli)