Updating build process to create .d.ts declaration files

.gitignore

@@ -6,3 +6,5 @@ package-lock.json
 /test/output
 /jco.sh
 /docs/book
+/src/**/*.d.ts
+/src/**/*.d.ts.map

tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "include": ["src/**/*"],
+  "compilerOptions": {
+    "allowJs": true,
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "declarationMap": true
+  }
+}

xtask/src/build/jco.rs

@@ -1,8 +1,7 @@
-use anyhow::Context;
+use anyhow::{Context, Result};
 use std::{collections::HashMap, fs, io::Write, path::PathBuf};
-
-use anyhow::Result;
 use wit_component::ComponentEncoder;
+use xshell::{cmd, Shell};
 
 pub(crate) fn run() -> Result<()> {
     transpile(
@@ -14,6 +13,17 @@ pub(crate) fn run() -> Result<()> {
         "wasm-tools".to_string(),
     )?;
 
+    let sh = Shell::new()?;
+    //Typescript doesn't support arbitrary module namespace identifier names so
+    //we need to remove it from wasm-tools.js before compiling
+    //See: https://github.com/microsoft/TypeScript/issues/40594
+    cmd!(
+        sh,
+        "sed -i'' -e 's/tools as \"local:wasm-tools\\/tools\"//g' ./obj/wasm-tools.js"
+    )
+    .read()?;
+    cmd!(sh, "npx tsc -p tsconfig.json").read()?;
+
     Ok(())
 }