wu-sheng opened a new pull request, #13737:
URL: https://github.com/apache/skywalking/pull/13737
### Add `def` local variable support in LAL DSL
- [x] Update the documentation to include this new feature.
- [x] Tests(including UT, IT, E2E) are added to verify the new feature.
**Grammar**: `def varName = expression` with optional `as TypeName` cast
(built-in types or FQCN).
**Built-in functions**: `toJson()` converts String/Map/protobuf `Struct` to
Gson `JsonObject`; `toJsonArray()` converts to `JsonArray`.
**Type inference**: Variable type inferred at compile time from initializer
expression. Supports null-safe navigation (`?.`) and method chaining on the
inferred type. Optional `as` cast narrows type when the inferred type is too
general (e.g., `Object` from generic API).
**Runtime helpers**: `LalRuntimeHelper.toJsonObject()` overloads for String,
Map, and protobuf Struct (recursive field conversion).
**Test reorganization**: Split monolithic `LALClassGeneratorTest` (641
lines) into 5 scoped test classes:
- `LALClassGeneratorBasicTest` (10 tests)
- `LALClassGeneratorConditionTest` (10 tests)
- `LALClassGeneratorExtractorTest` (10 tests)
- `LALClassGeneratorDefTest` (10 tests)
- `LALClassGeneratorSinkTest` (5 tests)
Plus shared `LALClassGeneratorTestBase` with `.class` file output to
`target/lal-generated-classes/` and `{TestClass}_{testMethod}` naming.
**ALS-specific tests**: `EnvoyAlsLalTest` in envoy receiver module — 3 tests
for JWT extraction from proto `filter_metadata` via chained `def` variables.
- [x] Update the [`CHANGES`
log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
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