39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
# ADR 0002: Own YAML Semantics Behind a Private Parser Boundary
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## Status
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Accepted. This records a design decision, not implementation completion.
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## Date
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2026-09-06
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## Context
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A shared library cannot provide consistent configuration semantics if each
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consumer inherits parser conversions, node types, and extension behavior.
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Exposing parser types also makes dependency changes part of the public API.
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## Decision
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ConfigKit defines its supported YAML policy and keeps parser integration private.
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Application types and diagnostics must not require parser-specific public types.
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Use a small internal boundary rather than a general parser/provider framework.
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The [architecture policy](../policy/architecture.md) owns this constraint; the
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[target design](../roadmap/initial.md#yaml-and-scalar-policy) owns planned syntax.
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## Alternatives considered
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- Expose parser nodes and hooks: easy integration but couples consumers to parser
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behavior and permits bypassing library policy.
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- Adopt the parser's entire YAML behavior: reduces initial code but leaves core
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semantics outside ConfigKit's control.
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- Abstract many configuration languages immediately: adds unsupported scope.
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## Consequences
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Parser changes require behavior-level compatibility verification. ConfigKit must
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translate errors safely and enforce its own supported subset. Some existing
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consumer custom decoders will need replacement with library-supported mechanisms
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or application resolution. No particular parser dependency is selected here.
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