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[Bug] Compiler drops nested empty objects from variable defaults

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难度
2/5
预计耗时
1-3 小时
新手友好度
78/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
node.js, typescript
领域
backend, testing

调研方向

从 packages/compiler/src/ast-helpers.ts 开始，重点查看 extractDictExpression() 及其调用方，这些调用方会提取对象默认值和数组值。使用提供的源代码重现问题，并检查 output.agent_version.state_variables。当嵌套的空对象在 payload 和 items 的默认值中都得以保留，并且这些情况有回归测试覆盖时，即完成。

由索引模型根据 Issue 内容生成。

描述

Description

Empty objects inside object and list variable defaults disappear during compilation. This removes object properties and changes list lengths and element positions without a diagnostic.

Steps to Reproduce

  1. Check out salesforce/agentscript at ace15eb2dc75564fd9e214385ac045c539056770 (current main).
  2. Parse the source below with @agentscript/parser, convert it with new Dialect().parse(mappingNode, AgentforceSchema), and run the Agentforce defaultRules() through LintEngine with agentforceSchemaContext.
  3. Pass the parsed value to the compiler's compile() and inspect output.agent_version.state_variables.

Expected Behavior

The payload default remains {"empty": {}, "full": {"n": 1}}, and the items default remains [{}, {"n": 1}, {}].

Actual Behavior

The compiler emits:

{"developer_name": "payload", "default": {"full": {"n": 1}}}
{"developer_name": "items", "default": [{"n": 1}]}

The parser, schema, lint engine, and compiler return no diagnostics for this source. A standalone mutable object = {} retains its empty default, and a list[string] = ["a", "b"] retains both elements.

Environment

  • Node.js: 22.20.0
  • pnpm: 10.34.6
  • OS: macOS 27.0.1, arm64
  • Package: @agentscript/compiler 3.26.1, source checkout at the commit above
  • Parser: default JavaScript backend

Minimal Reproduction

config:
    agent_name: "TestBot"
    agent_type: "AgentforceServiceAgent"
access:
    default_agent_user: "[email protected]"
variables:
    payload: mutable object = {"empty": {}, "full": {"n": 1}}
    items: mutable list[object] = [{}, {"n": 1}, {}]
start_agent main:
    description: "Test"
    reasoning:
        instructions: ->
            | {[email protected]} {[email protected]}

Additional Context

extractDictExpression() in packages/compiler/src/ast-helpers.ts returns undefined for an empty dictionary. Its caller omits dictionary values that are undefined, and extractExpressionValue() filters them out of arrays. The same helper handles default extraction, so an empty dictionary is treated as a missing value when nested.

Reproduced offline through parse → schema → lint → compile, with assertions on both corrupted defaults and the standalone-object/string-list controls. The existing compiler suite passes (1,113 passed, 3 skipped), so it does not catch these cases. The standard dependency build was blocked by the missing tree-sitter CLI; the required TypeScript packages were built directly. No fix is included in this report.

主要语言
TypeScript
星标
272
派生
55
平均合并
12 小时 18 分钟
30 天内合并 PR
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