Potential JavaScript API

From looking at the Rust API it would be something like this?

interface InstrumentationConfig {
  // Some instrumentation config
}

function create(...configs: InstrumentationConfig[]): InstrumentationMatcher;

interface InstrumentationMatcher {
  // If this returns undefined, we know there's no transforming required for this specific file
  getTransformer(moduleName: string, moduleVersion: string, file_path: string): Transformer | undefined;
}

interface Transformer {
  transform(source: string): string;
  transformWithSourcemap(source: string, sourcemap: string): [string, string];
}

Start by reviewing the Rust API referenced in the issue and the repository's existing JavaScript entry points. Determine whether this proposed TypeScript surface matches the project's intended configuration, matching, transformation, and sourcemap behavior; the work is done when the API design is agreed and its implementation and validation scope are defined.