reluxscript 0.1.4

Write AST transformations once. Compile to Babel, SWC, and beyond.
Documentation 
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/**
 * Test: String Interpolation ($"...")
 *
 * C# developers write:
 *   $"Hello {name}, you have {count} items"
 *
 * Instead of:
 *   format!("Hello {}, you have {} items", name, count)
 */
plugin StringInterpolation {

    struct State {
        result: Str,
    }

    fn init() -> State {
        State { result: "" }
    }

    pub fn visit_identifier(node: &Identifier) {
        let name = node.name.clone();
        let count = 42;

        // Basic interpolation
        let msg1 = $"Hello {name}";

        // Multiple expressions
        let msg2 = $"User {name} has {count} items";

        // Expressions with method calls
        let msg3 = $"Uppercase: {name.to_uppercase()}";

        // Expressions with member access
        let msg4 = $"Length: {name.len()}";

        // Nested braces (escaped)
        let msg5 = $"JSON: {{\"name\": \"{name}\"}}";

        // Complex expressions
        let msg6 = $"Double: {count * 2}, Half: {count / 2}";

        // Conditional expression inside interpolation
        let msg7 = $"Status: {if count > 10 { "many" } else { "few" }}";

        // Empty interpolation parts
        let msg8 = $"{name}";
        let msg9 = $"prefix{name}suffix";

        // Multi-line (if supported)
        let msg10 = $"Line 1: {name}
Line 2: {count}";

        self.state.result = msg2;
    }

    fn finish() -> Str {
        self.state.result
    }
}