C# JavaScript surface

Select with surfaces: ["js"]. The target composes the shared JavaScript source profile and references @tsonic/csharp-js.

Implemented families include arrays, strings, maps, sets, dates, JSON with replacer callbacks and selected toJSON, regular expressions, promises, Intl, symbols, weak collections, timers, numeric typed arrays, number/math operations, and console APIs covered by the selected operation tables and runtime proofs.

const expression = /(?<name>[a-z]+)/giu;
const match = expression.exec("Tsonic");
console.log(match?.groups?.name);

Regular expressions use complete ECMAScript syntax and state rather than System.Text.RegularExpressions approximation. Exact JavaScript UTF-16 values use the explicit JsString lane; ordinary native strings remain the default.

Open reflection, eval, arbitrary dynamic member access, and unsupported runtime object projection remain rejected.

See the detailed support inventory.