Expose typescript option in wasm2es6js

crates/wasm-bindgen-cli/src/bin/wasm2es6js.rs

@@ -4,13 +4,11 @@ extern crate docopt;
 extern crate parity_wasm;
 extern crate wasm_bindgen_cli_support;
 
-use std::collections::HashSet;
 use std::fs::File;
 use std::io::{Write, Read};
 use std::path::PathBuf;
 
 use docopt::Docopt;
-use parity_wasm::elements::*;
 
 const USAGE: &'static str = "
 Converts a wasm file to an ES6 JS module
@@ -22,12 +20,14 @@ Usage:
 Options:
     -h --help               Show this screen.
     -o --output FILE        File to place output in
+    --output-ts FILE        File to place a typescript definition of the module to
     --base64                Inline the wasm module using base64 encoding
 ";
 
 #[derive(Debug, Deserialize)]
 struct Args {
     flag_output: Option<PathBuf>,
+    flag_output_ts: Option<PathBuf>,
     flag_base64: bool,
     arg_input: PathBuf,
 }
@@ -49,6 +49,12 @@ fn main() {
         .base64(args.flag_base64)
         .generate(&wasm)
         .expect("failed to parse wasm");
+
+    if let Some(ref p) = args.flag_output_ts {
+        File::create(p).expect("failed to create output")
+            .write_all(object.typescript().as_bytes()).expect("failed to write output");
+    }
+
     let js = object.js();
 
     match args.flag_output {