Reland "Create an old program to be used in snapshot." (#3747)

* read CLI assets from disk during snapshotting

1 files changed, 28 insertions, 2 deletions

diff --git a/deno_typescript/ops.rs b/deno_typescript/ops.rs
index e45349591..0680d07b3 100644
--- a/deno_typescript/ops.rs
+++ b/deno_typescript/ops.rs
@@ -41,11 +41,16 @@ struct ReadFile {
   should_create_new_source_file: bool,
 }
 
-pub fn read_file(_s: &mut TSState, v: Value) -> Result<Value, ErrBox> {
+pub fn read_file(s: &mut TSState, v: Value) -> Result<Value, ErrBox> {
   let v: ReadFile = serde_json::from_value(v)?;
   let (module_name, source_code) = if v.file_name.starts_with("$asset$/") {
     let asset = v.file_name.replace("$asset$/", "");
-    let source_code = crate::get_asset2(&asset)?.to_string();
+
+    let source_code = match s.custom_assets.get(&asset) {
+      Some(asset_path) => std::fs::read_to_string(&asset_path)?,
+      None => crate::get_asset2(&asset)?.to_string(),
+    };
+
     (asset, source_code)
   } else {
     assert!(!v.file_name.starts_with("$assets$"), "you meant $asset$");
@@ -112,6 +117,27 @@ pub fn resolve_module_names(
 
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
+struct FetchAssetArgs {
+  name: String,
+}
+
+pub fn fetch_asset(s: &mut TSState, v: Value) -> Result<Value, ErrBox> {
+  let args: FetchAssetArgs = serde_json::from_value(v)?;
+
+  if let Some(asset_path) = s.custom_assets.get(&args.name) {
+    let source_code = std::fs::read_to_string(&asset_path)?;
+    return Ok(json!(source_code));
+  }
+
+  if let Some(source_code) = crate::get_asset(&args.name) {
+    Ok(json!(source_code))
+  } else {
+    panic!("op_fetch_asset bad asset {}", args.name)
+  }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
 struct Exit {
   code: i32,
 }