📝 Update More API Document

docs/api/parse-and-build-library-async-logger.md

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+---
+name: parse-and-build-library-async-logger
+group: api
+category: facade
+update-time: 20260520
+description: Parse JSON async build config text and build the library-facing async logger facade.
+key-word:
+    - library
+    - async
+    - parse
+    - public
+---
+
+## Parse-and-build-library-async-logger
+
+Parse raw JSON async build config text and build a `LibraryAsyncLogger[RuntimeSink]` in one step. This facade is the text-driven library counterpart to the general async config parser plus builder flow.
+
+### Interface
+
+```moonbit
+pub fn parse_and_build_library_async_logger(
+  input : String,
+) -> LibraryAsyncLogger[RuntimeSink] raise {
+```
+
+#### input
+
+- `input : String` - Raw JSON async logger build config text.
+
+#### output
+
+- `LibraryAsyncLogger[RuntimeSink]` - Library-facing async runtime logger wrapper.
+
+### Explanation
+
+Detailed rules explaining key parameters and behaviors
+
+- This API parses async build config text, validates it, builds the async runtime logger, and narrows it to the library facade.
+- The resulting facade keeps async lifecycle helpers while exposing a smaller public surface.
+- `to_async_logger()` can recover the underlying async logger when a wider API is required.
+
+### How to Use
+
+Here are some specific examples provided.
+
+#### When Need Text-driven Async Library Bootstrapping
+
+When a package accepts raw config text but wants a narrower async facade output:
+```moonbit
+let logger = parse_and_build_library_async_logger(
+  "{\"logger\":{\"target\":\"lib.async\",\"sink\":{\"kind\":\"console\"}},\"async_config\":{\"max_pending\":4,\"overflow\":\"DropNewest\",\"max_batch\":1,\"linger_ms\":0,\"flush\":\"Never\"}}",
+)
+```
+
+In this example, parsing and library-facade construction happen together.
+
+### Error Case
+
+e.g.:
+- If the JSON text is malformed, parsing raises an error.
+
+- If the embedded config is invalid, parsing raises before the library facade is returned.
+
+### Notes
+
+1. This is the narrow async library parse-and-build facade.
+
+2. Use `build_library_async_logger(...)` when the config is already typed.