Examples - Aspect Build

Ported from Go implementations

bzl_library

Here is a simple real-world example. Here we have ported the bzl_library generator from the Go code in bazel-skylib. To query the Starlark language and gather all load statements, we use this Tree-sitter query:

"loads": aspect.AstQuery(
    grammar = "starlark",
    query = """(module
        (expression_statement
            (call 
                function: (identifier) @id
                arguments: (argument_list
                    (string) @path
                    (string)
                )
            )
            (#eq? @id "load")
        )
    )""",
)

Here’s the full code listing: bzl_library.star.

Kotlin

As another example, we’ve ported the Kotlin Go implementation to Starlark: kotlin.star.

From scratch

PostCSS

A third-party OSS example: postcss.star.

C++

This rudimentary rules_cc.axl extension demonstrates the value of being able to hard-code some dependencies like @sqlite3. It’s not generalized enough to publish as a generic OSS extension, but it’s much quicker to iterate on and solves basic cases.

​Ported from Go implementations

​bzl_library

​Kotlin

​From scratch

​PostCSS

​C++

Ported from Go implementations

bzl_library

Kotlin

From scratch

PostCSS

C++