Encode op errors as strings instead of numbers (#6977)

cli/op_error.rs

@@ -54,15 +54,75 @@ pub enum ErrorKind {
   Busy = 23,
 }
 
+impl From<ErrorKind> for String {
+  fn from(kind: ErrorKind) -> Self {
+    let s = match kind {
+      ErrorKind::NotFound => "NotFound",
+      ErrorKind::PermissionDenied => "PermissionDenied",
+      ErrorKind::ConnectionRefused => "ConnectionRefused",
+      ErrorKind::ConnectionReset => "ConnectionReset",
+      ErrorKind::ConnectionAborted => "ConnectionAborted",
+      ErrorKind::NotConnected => "NotConnected",
+      ErrorKind::AddrInUse => "AddrInUse",
+      ErrorKind::AddrNotAvailable => "AddrNotAvailable",
+      ErrorKind::BrokenPipe => "BrokenPipe",
+      ErrorKind::AlreadyExists => "AlreadyExists",
+      ErrorKind::InvalidData => "InvalidData",
+      ErrorKind::TimedOut => "TimedOut",
+      ErrorKind::Interrupted => "Interrupted",
+      ErrorKind::WriteZero => "WriteZero",
+      ErrorKind::UnexpectedEof => "UnexpectedEof",
+      ErrorKind::BadResource => "BadResource",
+      ErrorKind::Http => "Http",
+      ErrorKind::URIError => "URIError",
+      ErrorKind::TypeError => "TypeError",
+      ErrorKind::Other => "Other",
+      ErrorKind::Busy => "Busy",
+    };
+
+    s.to_string()
+  }
+}
+
+fn error_str_to_kind(kind_str: &str) -> ErrorKind {
+  match kind_str {
+    "NotFound" => ErrorKind::NotFound,
+    "PermissionDenied" => ErrorKind::PermissionDenied,
+    "ConnectionRefused" => ErrorKind::ConnectionRefused,
+    "ConnectionReset" => ErrorKind::ConnectionReset,
+    "ConnectionAborted" => ErrorKind::ConnectionAborted,
+    "NotConnected" => ErrorKind::NotConnected,
+    "AddrInUse" => ErrorKind::AddrInUse,
+    "AddrNotAvailable" => ErrorKind::AddrNotAvailable,
+    "BrokenPipe" => ErrorKind::BrokenPipe,
+    "AlreadyExists" => ErrorKind::AlreadyExists,
+    "InvalidData" => ErrorKind::InvalidData,
+    "TimedOut" => ErrorKind::TimedOut,
+    "Interrupted" => ErrorKind::Interrupted,
+    "WriteZero" => ErrorKind::WriteZero,
+    "UnexpectedEof" => ErrorKind::UnexpectedEof,
+    "BadResource" => ErrorKind::BadResource,
+    "Http" => ErrorKind::Http,
+    "URIError" => ErrorKind::URIError,
+    "TypeError" => ErrorKind::TypeError,
+    "Other" => ErrorKind::Other,
+    "Busy" => ErrorKind::Busy,
+    _ => panic!("unknown error kind"),
+  }
+}
+
 #[derive(Debug)]
 pub struct OpError {
-  pub kind: ErrorKind,
+  pub kind_str: String,
   pub msg: String,
 }
 
 impl OpError {
   fn new(kind: ErrorKind, msg: String) -> Self {
-    Self { kind, msg }
+    Self {
+      kind_str: kind.into(),
+      msg,
+    }
   }
 
   pub fn not_found(msg: String) -> Self {
@@ -112,6 +172,10 @@ impl OpError {
       "resource is unavailable because it is in use by a promise".to_string(),
     )
   }
+
+  pub fn invalid_domain_error() -> OpError {
+    OpError::new(ErrorKind::TypeError, "Invalid domain.".to_string())
+  }
 }
 
 impl Error for OpError {}
@@ -130,10 +194,7 @@ impl From<ImportMapError> for OpError {
 
 impl From<&ImportMapError> for OpError {
   fn from(error: &ImportMapError) -> Self {
-    Self {
-      kind: ErrorKind::Other,
-      msg: error.to_string(),
-    }
+    Self::new(ErrorKind::Other, error.to_string())
   }
 }
 
@@ -145,10 +206,7 @@ impl From<ModuleResolutionError> for OpError {
 
 impl From<&ModuleResolutionError> for OpError {
   fn from(error: &ModuleResolutionError) -> Self {
-    Self {
-      kind: ErrorKind::URIError,
-      msg: error.to_string(),
-    }
+    Self::new(ErrorKind::URIError, error.to_string())
   }
 }
 
@@ -166,10 +224,7 @@ impl From<&VarError> for OpError {
       NotUnicode(..) => ErrorKind::InvalidData,
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -206,10 +261,7 @@ impl From<&io::Error> for OpError {
       _ => unreachable!(),
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -221,10 +273,7 @@ impl From<url::ParseError> for OpError {
 
 impl From<&url::ParseError> for OpError {
   fn from(error: &url::ParseError) -> Self {
-    Self {
-      kind: ErrorKind::URIError,
-      msg: error.to_string(),
-    }
+    Self::new(ErrorKind::URIError, error.to_string())
   }
 }
 impl From<reqwest::Error> for OpError {
@@ -252,14 +301,8 @@ impl From<&reqwest::Error> for OpError {
             .downcast_ref::<serde_json::error::Error>()
             .map(|e| e.into())
         })
-        .unwrap_or_else(|| Self {
-          kind: ErrorKind::Http,
-          msg: error.to_string(),
-        }),
-      None => Self {
-        kind: ErrorKind::Http,
-        msg: error.to_string(),
-      },
+        .unwrap_or_else(|| Self::new(ErrorKind::Http, error.to_string())),
+      None => Self::new(ErrorKind::Http, error.to_string()),
     }
   }
 }
@@ -282,10 +325,7 @@ impl From<&ReadlineError> for OpError {
       _ => unimplemented!(),
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -305,10 +345,7 @@ impl From<&serde_json::error::Error> for OpError {
       Category::Eof => ErrorKind::UnexpectedEof,
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -328,10 +365,7 @@ impl From<nix::Error> for OpError {
       nix::Error::UnsupportedOperation => unreachable!(),
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -352,10 +386,7 @@ impl From<&dlopen::Error> for OpError {
       NullSymbol => ErrorKind::Other,
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -376,10 +407,7 @@ impl From<&notify::Error> for OpError {
       InvalidConfig(_) => ErrorKind::InvalidData,
     };
 
-    Self {
-      kind,
-      msg: error.to_string(),
-    }
+    Self::new(kind, error.to_string())
   }
 }
 
@@ -391,10 +419,7 @@ impl From<SwcDiagnosticBuffer> for OpError {
 
 impl From<&SwcDiagnosticBuffer> for OpError {
   fn from(error: &SwcDiagnosticBuffer) -> Self {
-    Self {
-      kind: ErrorKind::Other,
-      msg: error.diagnostics.join(", "),
-    }
+    Self::new(ErrorKind::Other, error.diagnostics.join(", "))
   }
 }
 
@@ -412,9 +437,9 @@ impl From<ErrBox> for OpError {
 
     None
       .or_else(|| {
-        error
-          .downcast_ref::<OpError>()
-          .map(|e| OpError::new(e.kind, e.msg.to_string()))
+        error.downcast_ref::<OpError>().map(|e| {
+          OpError::new(error_str_to_kind(&e.kind_str), e.msg.to_string())
+        })
       })
       .or_else(|| error.downcast_ref::<reqwest::Error>().map(|e| e.into()))
       .or_else(|| error.downcast_ref::<ImportMapError>().map(|e| e.into()))
@@ -467,21 +492,21 @@ mod tests {
   #[test]
   fn test_simple_error() {
     let err = OpError::not_found("foo".to_string());
-    assert_eq!(err.kind, ErrorKind::NotFound);
+    assert_eq!(err.kind_str, "NotFound");
     assert_eq!(err.to_string(), "foo");
   }
 
   #[test]
   fn test_io_error() {
     let err = OpError::from(io_error());
-    assert_eq!(err.kind, ErrorKind::NotFound);
+    assert_eq!(err.kind_str, "NotFound");
     assert_eq!(err.to_string(), "entity not found");
   }
 
   #[test]
   fn test_url_error() {
     let err = OpError::from(url_error());
-    assert_eq!(err.kind, ErrorKind::URIError);
+    assert_eq!(err.kind_str, "URIError");
     assert_eq!(err.to_string(), "empty host");
   }
 
@@ -490,21 +515,21 @@ mod tests {
   #[test]
   fn test_import_map_error() {
     let err = OpError::from(import_map_error());
-    assert_eq!(err.kind, ErrorKind::Other);
+    assert_eq!(err.kind_str, "Other");
     assert_eq!(err.to_string(), "an import map error");
   }
 
   #[test]
   fn test_bad_resource() {
     let err = OpError::bad_resource("Resource has been closed".to_string());
-    assert_eq!(err.kind, ErrorKind::BadResource);
+    assert_eq!(err.kind_str, "BadResource");
     assert_eq!(err.to_string(), "Resource has been closed");
   }
 
   #[test]
   fn test_bad_resource_id() {
     let err = OpError::bad_resource_id();
-    assert_eq!(err.kind, ErrorKind::BadResource);
+    assert_eq!(err.kind_str, "BadResource");
     assert_eq!(err.to_string(), "Bad resource ID");
   }
 
@@ -513,7 +538,7 @@ mod tests {
     let err = OpError::permission_denied(
       "run again with the --allow-net flag".to_string(),
     );
-    assert_eq!(err.kind, ErrorKind::PermissionDenied);
+    assert_eq!(err.kind_str, "PermissionDenied");
     assert_eq!(err.to_string(), "run again with the --allow-net flag");
   }
 }

cli/ops/dispatch_json.rs

@@ -27,7 +27,7 @@ pub enum JsonOp {
 fn json_err(err: OpError) -> Value {
   json!({
     "message": err.msg,
-    "kind": err.kind as u32,
+    "kind": err.kind_str,
   })
 }
 

cli/ops/dispatch_minimal.rs

@@ -40,21 +40,24 @@ impl Into<Buf> for Record {
 pub struct ErrorRecord {
   pub promise_id: i32,
   pub arg: i32,
-  pub error_code: i32,
+  pub error_len: i32,
+  pub error_code: Vec<u8>,
   pub error_message: Vec<u8>,
 }
 
 impl Into<Buf> for ErrorRecord {
   fn into(self) -> Buf {
-    let v32: Vec<i32> = vec![self.promise_id, self.arg, self.error_code];
+    let v32: Vec<i32> = vec![self.promise_id, self.arg, self.error_len];
     let mut v8: Vec<u8> = Vec::new();
     for n in v32 {
       v8.write_i32::<LittleEndian>(n).unwrap();
     }
+    let mut code = self.error_code;
     let mut message = self.error_message;
-    // Align to 32bit word, padding with the space character.
-    message.resize((message.len() + 3usize) & !3usize, b' ');
+    v8.append(&mut code);
     v8.append(&mut message);
+    // Align to 32bit word, padding with the space character.
+    v8.resize((v8.len() + 3usize) & !3usize, b' ');
     v8.into_boxed_slice()
   }
 }
@@ -62,13 +65,14 @@ impl Into<Buf> for ErrorRecord {
 #[test]
 fn test_error_record() {
   let expected = vec![
-    1, 0, 0, 0, 255, 255, 255, 255, 10, 0, 0, 0, 69, 114, 114, 111, 114, 32,
-    32, 32,
+    1, 0, 0, 0, 255, 255, 255, 255, 11, 0, 0, 0, 66, 97, 100, 82, 101, 115,
+    111, 117, 114, 99, 101, 69, 114, 114, 111, 114,
   ];
   let err_record = ErrorRecord {
     promise_id: 1,
     arg: -1,
-    error_code: 10,
+    error_len: 11,
+    error_code: "BadResource".to_string().as_bytes().to_owned(),
     error_message: "Error".to_string().as_bytes().to_owned(),
   };
   let buf: Buf = err_record.into();
@@ -128,7 +132,8 @@ where
         let error_record = ErrorRecord {
           promise_id: 0,
           arg: -1,
-          error_code: e.kind as i32,
+          error_len: e.kind_str.len() as i32,
+          error_code: e.kind_str.as_bytes().to_owned(),
           error_message: e.msg.as_bytes().to_owned(),
         };
         return Op::Sync(error_record.into());
@@ -148,7 +153,8 @@ where
           let error_record = ErrorRecord {
             promise_id: record.promise_id,
             arg: -1,
-            error_code: err.kind as i32,
+            error_len: err.kind_str.len() as i32,
+            error_code: err.kind_str.as_bytes().to_owned(),
             error_message: err.msg.as_bytes().to_owned(),
           };
           error_record.into()
@@ -165,7 +171,8 @@ where
               let error_record = ErrorRecord {
                 promise_id: record.promise_id,
                 arg: -1,
-                error_code: err.kind as i32,
+                error_len: err.kind_str.len() as i32,
+                error_code: err.kind_str.as_bytes().to_owned(),
                 error_message: err.msg.as_bytes().to_owned(),
               };
               error_record.into()

cli/ops/idna.rs

@@ -3,7 +3,7 @@
 //! https://url.spec.whatwg.org/#idna
 
 use super::dispatch_json::{Deserialize, JsonOp, Value};
-use crate::op_error::{ErrorKind, OpError};
+use crate::op_error::OpError;
 use crate::state::State;
 use deno_core::CoreIsolate;
 use deno_core::ZeroCopyBuf;
@@ -13,13 +13,6 @@ pub fn init(i: &mut CoreIsolate, s: &State) {
   i.register_op("op_domain_to_ascii", s.stateful_json_op(op_domain_to_ascii));
 }
 
-fn invalid_domain_error() -> OpError {
-  OpError {
-    kind: ErrorKind::TypeError,
-    msg: "Invalid domain.".to_string(),
-  }
-}
-
 #[derive(Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct DomainToAscii {
@@ -35,9 +28,10 @@ fn op_domain_to_ascii(
   let args: DomainToAscii = serde_json::from_value(args)?;
   let domain = if args.be_strict {
     domain_to_ascii_strict(args.domain.as_str())
-      .map_err(|_| invalid_domain_error())?
+      .map_err(|_| OpError::invalid_domain_error())?
   } else {
-    domain_to_ascii(args.domain.as_str()).map_err(|_| invalid_domain_error())?
+    domain_to_ascii(args.domain.as_str())
+      .map_err(|_| OpError::invalid_domain_error())?
   };
   Ok(JsonOp::Sync(json!(domain)))
 }

cli/permissions.rs

@@ -860,8 +860,8 @@ mod tests {
       perms4
         .request_net(&Some("localhost:8080"))
         .unwrap_err()
-        .kind,
-      crate::op_error::ErrorKind::URIError
+        .kind_str,
+      "URIError"
     );
 
     let mut perms5 = Permissions::from_flags(&Flags {
@@ -870,8 +870,11 @@ mod tests {
     });
     set_prompt_result(false);
     assert_eq!(
-      perms5.request_net(&Some("file:/1.txt")).unwrap_err().kind,
-      crate::op_error::ErrorKind::URIError
+      perms5
+        .request_net(&Some("file:/1.txt"))
+        .unwrap_err()
+        .kind_str,
+      "URIError"
     );
 
     drop(guard);

cli/rt/01_errors.js

@@ -1,101 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 ((window) => {
-  // Warning! The values in this enum are duplicated in cli/op_error.rs
-  // Update carefully!
-  const ErrorKind = {
-    1: "NotFound",
-    2: "PermissionDenied",
-    3: "ConnectionRefused",
-    4: "ConnectionReset",
-    5: "ConnectionAborted",
-    6: "NotConnected",
-    7: "AddrInUse",
-    8: "AddrNotAvailable",
-    9: "BrokenPipe",
-    10: "AlreadyExists",
-    13: "InvalidData",
-    14: "TimedOut",
-    15: "Interrupted",
-    16: "WriteZero",
-    17: "UnexpectedEof",
-    18: "BadResource",
-    19: "Http",
-    20: "URIError",
-    21: "TypeError",
-    22: "Other",
-    23: "Busy",
-
-    NotFound: 1,
-    PermissionDenied: 2,
-    ConnectionRefused: 3,
-    ConnectionReset: 4,
-    ConnectionAborted: 5,
-    NotConnected: 6,
-    AddrInUse: 7,
-    AddrNotAvailable: 8,
-    BrokenPipe: 9,
-    AlreadyExists: 10,
-    InvalidData: 13,
-    TimedOut: 14,
-    Interrupted: 15,
-    WriteZero: 16,
-    UnexpectedEof: 17,
-    BadResource: 18,
-    Http: 19,
-    URIError: 20,
-    TypeError: 21,
-    Other: 22,
-    Busy: 23,
-  };
-
-  function getErrorClass(kind) {
-    switch (kind) {
-      case ErrorKind.TypeError:
-        return TypeError;
-      case ErrorKind.Other:
-        return Error;
-      case ErrorKind.URIError:
-        return URIError;
-      case ErrorKind.NotFound:
-        return NotFound;
-      case ErrorKind.PermissionDenied:
-        return PermissionDenied;
-      case ErrorKind.ConnectionRefused:
-        return ConnectionRefused;
-      case ErrorKind.ConnectionReset:
-        return ConnectionReset;
-      case ErrorKind.ConnectionAborted:
-        return ConnectionAborted;
-      case ErrorKind.NotConnected:
-        return NotConnected;
-      case ErrorKind.AddrInUse:
-        return AddrInUse;
-      case ErrorKind.AddrNotAvailable:
-        return AddrNotAvailable;
-      case ErrorKind.BrokenPipe:
-        return BrokenPipe;
-      case ErrorKind.AlreadyExists:
-        return AlreadyExists;
-      case ErrorKind.InvalidData:
-        return InvalidData;
-      case ErrorKind.TimedOut:
-        return TimedOut;
-      case ErrorKind.Interrupted:
-        return Interrupted;
-      case ErrorKind.WriteZero:
-        return WriteZero;
-      case ErrorKind.UnexpectedEof:
-        return UnexpectedEof;
-      case ErrorKind.BadResource:
-        return BadResource;
-      case ErrorKind.Http:
-        return Http;
-      case ErrorKind.Busy:
-        return Busy;
-    }
-  }
-
   class NotFound extends Error {
     constructor(msg) {
       super(msg);
@@ -245,6 +150,5 @@
 
   window.__bootstrap.errors = {
     errors,
-    getErrorClass,
   };
 })(this);

cli/rt/10_dispatch_json.js

@@ -3,7 +3,6 @@
 ((window) => {
   const core = window.Deno.core;
   const util = window.__bootstrap.util;
-  const getErrorClass = window.__bootstrap.errors.getErrorClass;
   // Using an object without a prototype because `Map` was causing GC problems.
   const promiseTable = Object.create(null);
   let _nextPromiseId = 1;
@@ -22,7 +21,7 @@
 
   function unwrapResponse(res) {
     if (res.err != null) {
-      throw new (getErrorClass(res.err.kind))(res.err.message);
+      throw new (core.getErrorClass(res.err.kind))(res.err.message);
     }
     util.assert(res.ok != null);
     return res.ok;

cli/rt/10_dispatch_minimal.js

@@ -3,7 +3,6 @@
 ((window) => {
   const core = window.Deno.core;
   const util = window.__bootstrap.util;
-  const errorNs = window.__bootstrap.errors;
 
   // Using an object without a prototype because `Map` was causing GC problems.
   const promiseTableMin = Object.create(null);
@@ -32,11 +31,13 @@
     let err;
 
     if (arg < 0) {
-      const kind = result;
-      const message = decoder.decode(ui8.subarray(12));
-      err = { kind, message };
+      const codeLen = result;
+      const codeAndMessage = decoder.decode(ui8.subarray(12));
+      const errorCode = codeAndMessage.slice(0, codeLen);
+      const message = codeAndMessage.slice(codeLen);
+      err = { kind: errorCode, message };
     } else if (ui8.length != 12) {
-      throw new errorNs.errors.InvalidData("BadMessage");
+      throw new TypeError("Malformed response message");
     }
 
     return {
@@ -49,7 +50,7 @@
 
   function unwrapResponse(res) {
     if (res.err != null) {
-      throw new (errorNs.getErrorClass(res.err.kind))(res.err.message);
+      throw new (core.getErrorClass(res.err.kind))(res.err.message);
     }
     return res.result;
   }

cli/rt/99_main.js

@@ -34,6 +34,7 @@ delete Object.prototype.__proto__;
   const fetch = window.__bootstrap.fetch;
   const denoNs = window.__bootstrap.denoNs;
   const denoNsUnstable = window.__bootstrap.denoNsUnstable;
+  const errors = window.__bootstrap.errors.errors;
 
   let windowIsClosing = false;
 
@@ -175,6 +176,30 @@ delete Object.prototype.__proto__;
     return s;
   }
 
+  function registerErrors() {
+    core.registerErrorClass("NotFound", errors.NotFound);
+    core.registerErrorClass("PermissionDenied", errors.PermissionDenied);
+    core.registerErrorClass("ConnectionRefused", errors.ConnectionRefused);
+    core.registerErrorClass("ConnectionReset", errors.ConnectionReset);
+    core.registerErrorClass("ConnectionAborted", errors.ConnectionAborted);
+    core.registerErrorClass("NotConnected", errors.NotConnected);
+    core.registerErrorClass("AddrInUse", errors.AddrInUse);
+    core.registerErrorClass("AddrNotAvailable", errors.AddrNotAvailable);
+    core.registerErrorClass("BrokenPipe", errors.BrokenPipe);
+    core.registerErrorClass("AlreadyExists", errors.AlreadyExists);
+    core.registerErrorClass("InvalidData", errors.InvalidData);
+    core.registerErrorClass("TimedOut", errors.TimedOut);
+    core.registerErrorClass("Interrupted", errors.Interrupted);
+    core.registerErrorClass("WriteZero", errors.WriteZero);
+    core.registerErrorClass("UnexpectedEof", errors.UnexpectedEof);
+    core.registerErrorClass("BadResource", errors.BadResource);
+    core.registerErrorClass("Http", errors.Http);
+    core.registerErrorClass("URIError", URIError);
+    core.registerErrorClass("TypeError", TypeError);
+    core.registerErrorClass("Other", Error);
+    core.registerErrorClass("Busy", errors.Busy);
+  }
+
   // https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope
   const windowOrWorkerGlobalScopeMethods = {
     atob: util.writable(atob),
@@ -290,6 +315,8 @@ delete Object.prototype.__proto__;
     const { args, cwd, noColor, pid, ppid, repl, unstableFlag } =
       runtimeStart();
 
+    registerErrors();
+
     const finalDenoNs = {
       core,
       internal: internalSymbol,
@@ -347,6 +374,8 @@ delete Object.prototype.__proto__;
       internalName ?? name,
     );
 
+    registerErrors();
+
     const finalDenoNs = {
       core,
       internal: internalSymbol,

cli/tests/unit/dispatch_minimal_test.ts

@@ -43,7 +43,7 @@ unitTest(function malformedMinimalControlBuffer(): void {
     header.byteLength / 4,
   );
   const arg = buf32[1];
-  const message = new TextDecoder().decode(res.slice(12)).trim();
+  const codeAndMessage = new TextDecoder().decode(res.slice(12)).trim();
   assert(arg < 0);
-  assertEquals(message, "Unparsable control buffer");
+  assertEquals(codeAndMessage, "TypeErrorUnparsable control buffer");
 });

cli/tsc/01_errors.js

@@ -1,101 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 ((window) => {
-  // Warning! The values in this enum are duplicated in cli/op_error.rs
-  // Update carefully!
-  const ErrorKind = {
-    1: "NotFound",
-    2: "PermissionDenied",
-    3: "ConnectionRefused",
-    4: "ConnectionReset",
-    5: "ConnectionAborted",
-    6: "NotConnected",
-    7: "AddrInUse",
-    8: "AddrNotAvailable",
-    9: "BrokenPipe",
-    10: "AlreadyExists",
-    13: "InvalidData",
-    14: "TimedOut",
-    15: "Interrupted",
-    16: "WriteZero",
-    17: "UnexpectedEof",
-    18: "BadResource",
-    19: "Http",
-    20: "URIError",
-    21: "TypeError",
-    22: "Other",
-    23: "Busy",
-
-    NotFound: 1,
-    PermissionDenied: 2,
-    ConnectionRefused: 3,
-    ConnectionReset: 4,
-    ConnectionAborted: 5,
-    NotConnected: 6,
-    AddrInUse: 7,
-    AddrNotAvailable: 8,
-    BrokenPipe: 9,
-    AlreadyExists: 10,
-    InvalidData: 13,
-    TimedOut: 14,
-    Interrupted: 15,
-    WriteZero: 16,
-    UnexpectedEof: 17,
-    BadResource: 18,
-    Http: 19,
-    URIError: 20,
-    TypeError: 21,
-    Other: 22,
-    Busy: 23,
-  };
-
-  function getErrorClass(kind) {
-    switch (kind) {
-      case ErrorKind.TypeError:
-        return TypeError;
-      case ErrorKind.Other:
-        return Error;
-      case ErrorKind.URIError:
-        return URIError;
-      case ErrorKind.NotFound:
-        return NotFound;
-      case ErrorKind.PermissionDenied:
-        return PermissionDenied;
-      case ErrorKind.ConnectionRefused:
-        return ConnectionRefused;
-      case ErrorKind.ConnectionReset:
-        return ConnectionReset;
-      case ErrorKind.ConnectionAborted:
-        return ConnectionAborted;
-      case ErrorKind.NotConnected:
-        return NotConnected;
-      case ErrorKind.AddrInUse:
-        return AddrInUse;
-      case ErrorKind.AddrNotAvailable:
-        return AddrNotAvailable;
-      case ErrorKind.BrokenPipe:
-        return BrokenPipe;
-      case ErrorKind.AlreadyExists:
-        return AlreadyExists;
-      case ErrorKind.InvalidData:
-        return InvalidData;
-      case ErrorKind.TimedOut:
-        return TimedOut;
-      case ErrorKind.Interrupted:
-        return Interrupted;
-      case ErrorKind.WriteZero:
-        return WriteZero;
-      case ErrorKind.UnexpectedEof:
-        return UnexpectedEof;
-      case ErrorKind.BadResource:
-        return BadResource;
-      case ErrorKind.Http:
-        return Http;
-      case ErrorKind.Busy:
-        return Busy;
-    }
-  }
-
   class NotFound extends Error {
     constructor(msg) {
       super(msg);
@@ -245,6 +150,5 @@
 
   window.__bootstrap.errors = {
     errors,
-    getErrorClass,
   };
 })(this);

cli/tsc/10_dispatch_json.js

@@ -3,7 +3,7 @@
 ((window) => {
   const core = window.Deno.core;
   const util = window.__bootstrap.util;
-  const getErrorClass = window.__bootstrap.errors.getErrorClass;
+
   // Using an object without a prototype because `Map` was causing GC problems.
   const promiseTable = Object.create(null);
   let _nextPromiseId = 1;
@@ -22,7 +22,7 @@
 
   function unwrapResponse(res) {
     if (res.err != null) {
-      throw new (getErrorClass(res.err.kind))(res.err.message);
+      throw new (core.getErrorClass(res.err.kind))(res.err.message);
     }
     util.assert(res.ok != null);
     return res.ok;

cli/tsc/99_main_compiler.js

@@ -23,6 +23,7 @@ delete Object.prototype.__proto__;
   const dispatchJson = window.__bootstrap.dispatchJson;
   const util = window.__bootstrap.util;
   const errorStack = window.__bootstrap.errorStack;
+  const errors = window.__bootstrap.errors.errors;
 
   function opNow() {
     const res = dispatchJson.sendSync("op_now");
@@ -1851,6 +1852,27 @@ delete Object.prototype.__proto__;
       throw new Error("Worker runtime already bootstrapped");
     }
     hasBootstrapped = true;
+    core.registerErrorClass("NotFound", errors.NotFound);
+    core.registerErrorClass("PermissionDenied", errors.PermissionDenied);
+    core.registerErrorClass("ConnectionRefused", errors.ConnectionRefused);
+    core.registerErrorClass("ConnectionReset", errors.ConnectionReset);
+    core.registerErrorClass("ConnectionAborted", errors.ConnectionAborted);
+    core.registerErrorClass("NotConnected", errors.NotConnected);
+    core.registerErrorClass("AddrInUse", errors.AddrInUse);
+    core.registerErrorClass("AddrNotAvailable", errors.AddrNotAvailable);
+    core.registerErrorClass("BrokenPipe", errors.BrokenPipe);
+    core.registerErrorClass("AlreadyExists", errors.AlreadyExists);
+    core.registerErrorClass("InvalidData", errors.InvalidData);
+    core.registerErrorClass("TimedOut", errors.TimedOut);
+    core.registerErrorClass("Interrupted", errors.Interrupted);
+    core.registerErrorClass("WriteZero", errors.WriteZero);
+    core.registerErrorClass("UnexpectedEof", errors.UnexpectedEof);
+    core.registerErrorClass("BadResource", errors.BadResource);
+    core.registerErrorClass("Http", errors.Http);
+    core.registerErrorClass("URIError", URIError);
+    core.registerErrorClass("TypeError", TypeError);
+    core.registerErrorClass("Other", Error);
+    core.registerErrorClass("Busy", errors.Busy);
     globalThis.__bootstrap = undefined;
     runtimeStart("TS");
   }

core/core.js

@@ -38,6 +38,7 @@ SharedQueue Binary Layout
 
   let initialized = false;
   let opsCache = {};
+  const errorMap = {};
 
   function maybeInit() {
     if (!initialized) {
@@ -187,11 +188,26 @@ SharedQueue Binary Layout
     return send(opsCache[opName], control, ...zeroCopy);
   }
 
+  function registerErrorClass(errorName, errorClass) {
+    if (typeof errorMap[errorName] !== "undefined") {
+      throw new TypeError(`Error class for "${errorName}" already registered`);
+    }
+    errorMap[errorName] = errorClass;
+  }
+
+  function getErrorClass(errorName) {
+    const errorClass = errorMap[errorName];
+    assert(errorClass);
+    return errorClass;
+  }
+
   Object.assign(window.Deno.core, {
     setAsyncHandler,
     dispatch: send,
     dispatchByName: dispatch,
     ops,
+    registerErrorClass,
+    getErrorClass,
     // sharedQueue is private but exposed for testing.
     sharedQueue: {
       MAX_RECORDS,