Preserve nested class construction when applying constructor defaults, closes #6491

[gcanti]

Summary by CodeRabbit

• Bug Fixes

  • Preserved nested class construction when applying constructor defaults.
  • Schema fields with constructor defaults now correctly produce class instances from plain object input.

• Tests

  • Added coverage for constructing nested schema classes with default values.

[changeset-bot]

🦋 Changeset detected

Latest commit: 720d5e7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 27 packages

Name	Type
effect	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/vitest	Patch
@effect/ai-anthropic	Patch
@effect/ai-openai-compat	Patch
@effect/ai-openai	Patch
@effect/ai-openrouter	Patch
@effect/atom-react	Patch
@effect/atom-solid	Patch
@effect/atom-vue	Patch
@effect/sql-clickhouse	Patch
@effect/sql-d1	Patch
@effect/sql-libsql	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-pglite	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-do	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/openapi-generator	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: 7e13e04b-bddd-4df7-9c66-726388e5c453

📥 Commits

Reviewing files that changed from the base of the PR and between ce95d88 and 720d5e7.

📒 Files selected for processing (3)

• .changeset/fix-6491.md
• packages/effect/src/SchemaParser.ts
• packages/effect/test/schema/Schema.test.ts

---

📝 Walkthrough

Walkthrough

Updates schema constructor AST handling so nested Schema.Class values remain constructible when constructor defaults are applied. Adds a regression test and a patch changeset.

Changes

Constructor defaults

Layer / File(s)	Summary
Constructor AST restoration and regression coverage packages/effect/src/SchemaParser.ts, packages/effect/test/schema/Schema.test.ts, .changeset/fix-6491.md	Replaces recursive default handling with constructor-aware AST conversion, preserves nested class construction for object and array nodes, adds a regression test, and records a patch release.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: bug, 4.0

Suggested reviewers: tim-smart

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: preserving nested class construction when applying constructor defaults.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

---

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

Bundle Size Analysis

File Name	Current Size	Previous Size	Difference
basic.ts	6.66 KB	6.66 KB	0.00 KB (0.00%)
batching.ts	9.26 KB	9.26 KB	0.00 KB (0.00%)
brand.ts	6.14 KB	6.14 KB	0.00 KB (0.00%)
cache.ts	9.90 KB	9.90 KB	0.00 KB (0.00%)
config.ts	18.88 KB	18.87 KB	+0.01 KB (+0.07%)
differ.ts	17.10 KB	17.09 KB	+0.01 KB (+0.08%)
http-client.ts	20.58 KB	20.58 KB	0.00 KB (0.00%)
logger.ts	10.25 KB	10.25 KB	0.00 KB (0.00%)
metric.ts	8.52 KB	8.52 KB	0.00 KB (0.00%)
optic.ts	7.35 KB	7.35 KB	0.00 KB (0.00%)
pubsub.ts	14.09 KB	14.09 KB	0.00 KB (0.00%)
queue.ts	11.09 KB	11.09 KB	0.00 KB (0.00%)
schedule.ts	10.29 KB	10.29 KB	0.00 KB (0.00%)
schema-class.ts	17.95 KB	17.95 KB	+0.01 KB (+0.04%)
schema-fromJsonSchemaDocument.ts	4.06 KB	4.06 KB	0.00 KB (0.00%)
schema-representation-roundtrip.ts	27.33 KB	27.31 KB	+0.02 KB (+0.06%)
schema-string-transformation.ts	12.62 KB	12.61 KB	+0.01 KB (+0.07%)
schema-string.ts	10.29 KB	10.27 KB	+0.03 KB (+0.24%)
schema-template-literal.ts	14.26 KB	14.25 KB	+0.01 KB (+0.06%)
schema-toArbitraryLazy.ts	20.73 KB	20.72 KB	+0.01 KB (+0.04%)
schema-toCodeDocument.ts	21.31 KB	21.30 KB	+0.01 KB (+0.03%)
schema-toCodecJson.ts	17.92 KB	17.92 KB	+0.01 KB (+0.04%)
schema-toEquivalence.ts	17.81 KB	17.81 KB	+0.01 KB (+0.04%)
schema-toFormatter.ts	17.64 KB	17.64 KB	+0.01 KB (+0.03%)
schema-toJsonSchemaDocument.ts	20.21 KB	20.20 KB	+0.01 KB (+0.03%)
schema-toRepresentation.ts	18.20 KB	18.19 KB	+0.01 KB (+0.04%)
schema.ts	17.23 KB	17.22 KB	+0.01 KB (+0.04%)
stm.ts	12.02 KB	12.02 KB	0.00 KB (0.00%)
stream.ts	9.29 KB	9.29 KB	0.00 KB (0.00%)