tsync/to_typescript/
consts.rs

1use syn::__private::ToTokens;
2
3use crate::{utils, BuildState};
4
5impl super::ToTypescript for syn::ItemConst {
6    fn convert_to_ts(self, state: &mut BuildState, config: &crate::BuildSettings) {
7        // ignore if we aren't in a type interface
8        if config.uses_type_interface {
9            return;
10        }
11
12        // this currently only supports literals
13        // e.g. const NAME: [type_ignored] = 0
14        // e.g. const NAME: [type_ignored] = "some_string"
15        // e.g. const NAME: [type_ignored] = serde_json::json!({ "I am valid": "json with no free variables" })
16        // however doesn't enforce that the json! macro contains no variables.
17        // if your lucky you might have also tsynced them but otherwise you will get a typescript error.
18
19        let name = self.ident.to_string();
20        let body = match self.expr.as_ref() {
21            syn::Expr::Lit(literal) => {
22                // convert it directly to a string to put in TS.
23                Some(literal.to_token_stream().to_string())
24            }
25            syn::Expr::Macro(mcr) => {
26                if mcr
27                    .mac
28                    .path
29                    .segments
30                    .iter()
31                    .any(|x| x.to_token_stream().to_string() == "json")
32                {
33                    Some(mcr.mac.tokens.to_string())
34                } else {
35                    None
36                }
37            }
38            _ => None,
39        };
40        match body {
41            Some(body) => {
42                state.types.push('\n');
43                let comments = utils::get_comments(self.attrs);
44                state.write_comments(&comments, 0);
45                state
46                    .types
47                    .push_str(&format!("export const {} = {};", name, body));
48                state.types.push('\n');
49            }
50            _ => {
51                if crate::DEBUG.try_get().is_some_and(|d| *d) {
52                    println!("#[tsync] failed for const {}", self.to_token_stream());
53                }
54            }
55        }
56    }
57}
tsync/to_typescript/consts.rs

tsync/to_typescript/
consts.rs
