## String Interpolation: `"text @{expr}"`
Interpolation works automatically inside string literals - no `format!()` needed:
```rust
let name = "World";
let count = 42;
let code = ts_template! {
console.log("Hello @{name}!");
console.log("Count: @{count}, doubled: @{count * 2}");
};
```
**Generates:**
```typescript
console.log("Hello World!");
console.log("Count: 42, doubled: 84");
```
This also works with method calls and complex expressions:
```rust
let field = "username";
let code = ts_template! {
throw new Error("Invalid @{field.to_uppercase()}");
};
```