glm-5.1
131e3e929b
Break the @alkdev/taskgraph architecture specs into dependency-ordered implementation tasks across 8 component directories: setup, schema, error, graph, analysis, cost-benefit, frontmatter, api, and review. Each task has clear acceptance criteria referencing specific architecture docs. Three review tasks serve as quality gates at critical junction points (schemas-and-errors, graph-complete, complete-library). The dependency graph is validated acyclic with 9 topological levels enabling significant parallelism across independent work streams.
43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
---
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id: error/error-hierarchy
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name: Implement typed error class hierarchy
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status: pending
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depends_on:
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- setup/project-init
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scope: narrow
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risk: trivial
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impact: phase
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level: implementation
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---
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## Description
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Implement the custom error classes in `src/error/index.ts` per [errors-validation.md](../../../docs/architecture/errors-validation.md). All errors extend `TaskgraphError` which extends `Error`. Each subclass adds typed fields for programmatic error recovery.
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## Acceptance Criteria
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- [ ] `src/error/index.ts` exports:
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- `TaskgraphError extends Error` — base class
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- `TaskNotFoundError extends TaskgraphError` with `taskId: string` field
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- `CircularDependencyError extends TaskgraphError` with `cycles: string[][]` field
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- `InvalidInputError extends TaskgraphError` with `field: string` and `message: string` fields
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- `DuplicateNodeError extends TaskgraphError` with `taskId: string` field
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- `DuplicateEdgeError extends TaskgraphError` with `prerequisite: string` and `dependent: string` fields
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- [ ] Each error class sets `this.name` to the class name
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- [ ] Each error class properly extends the prototype chain (`Object.setPrototypeOf(this, new.target.prototype)`)
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- [ ] `InvalidInputError` supports construction from TypeBox `Value.Errors()` output (receives structured field/path/value info)
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- [ ] `CircularDependencyError` receives `string[][]` where each inner array is an ordered cycle path
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- [ ] Unit tests verifying: correct `instanceof` chain, field access, `.name` property, error messages
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## References
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- docs/architecture/errors-validation.md — error types, when each is thrown
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- docs/architecture/api-surface.md — error documentation on specific methods
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## Notes
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> To be filled by implementation agent
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## Summary
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> To be filled on completion |