WIP

src/editor/calltree.js

@@ -13,6 +13,17 @@ const join = arr => arr.reduce(
   [],
 )
 
+const is_error = n =>
+  !n.ok 
+  || 
+  ( 
+    n.value instanceof globalThis.run_window.Promise 
+    && 
+    n.value.status != null
+    &&
+    !n.value.status.ok
+  )
+
 export class CallTree {
   constructor(ui, container) {
     this.ui = ui
@@ -108,7 +119,7 @@ export class CallTree {
           )
         : el('span', 
               'call_header ' 
-                + (n.ok ? '' : 'error') 
+                + (is_error(n) ? 'error' : '') 
                 + (n.fn.__location == null ? ' native' : '')
             ,
             // TODO show `this` argument

src/editor/value_explorer.js

@@ -42,10 +42,10 @@ export const stringify_for_header = v => {
     if(v.status == null) {
       return `Promise<pending>`
     } else {
-      if(status.ok) {
-        return `Promise<fulfilled: ${stringify_for_header(status.value)}>`
+      if(v.status.ok) {
+        return `Promise<fulfilled: ${stringify_for_header(v.status.value)}>`
       } else {
-        return `Promise<fulfilled: ${stringify_for_header(status.error)}>`
+        return `Promise<rejected: ${stringify_for_header(v.status.error)}>`
       }
     }
   } else if(isError(v)) {

src/eval.js

@@ -367,7 +367,7 @@ export const eval_modules = (
     }
 
     const set_promise_status = value => {
-      if(value instanceof Promise.Original) {
+      if(value instanceof Promise) {
         // record stack for async calls, so expand calls works sync
         set_record_call()
         return value
@@ -988,7 +988,7 @@ const do_eval_frame_expr = (node, scope, callsleft) => {
         ok = true
         value = - expr.result.value
       } else if(node.operator == 'await') {
-        if(expr.result.value instanceof globalThis.run_window.Promise.Original) {
+        if(expr.result.value instanceof globalThis.run_window.Promise) {
           const status = expr.result.value.status
           if(status == null) {
             // Promise must be already resolved

src/patch_promise.js

@@ -1,78 +1,37 @@
 export const patch_promise = window => {
 
-  if(window.Promise.Original != null) {
+  if(window.Promise.__patched) {
     // already patched
     return
   }
 
-  class PromiseRecordChildren extends Promise {
-    then(on_resolve, on_reject) {
-      let children = window.get_children()
-      if(children == null) {
-        children = []
-        window.set_children(children)
-      }
-      return super.then(
-        on_resolve == null
-          ? null
-          : value => {
-              window.set_children(children)
-              return on_resolve(value)
-            },
+  const _then = Promise.prototype.then
 
-        on_reject == null
-          ? null
-          : error => {
-            window.set_children(children)
-            return on_reject(error)
+  Promise.prototype.then = function then(on_resolve, on_reject) {
+    let children = window.get_children()
+    if(children == null) {
+      children = []
+      window.set_children(children)
+    }
+
+    const make_callback = cb => cb == null
+      ? null
+      : value => {
+          const current = window.get_children()
+          window.set_children(children)
+          try {
+            return cb(value)
+          } finally {
+            window.set_children(current)
           }
-      )
-    }
-  }
-
-  class PromiseWithStatus extends window.Promise {
-    constructor(fn) {
-      let status 
-      let is_constructor_finished = false
-      const p = new PromiseRecordChildren(
-        (resolve, reject) => {
-          fn(
-            (value) => {
-              if(value instanceof window.Promise.Original) {
-                value
-                  .then(v => {
-                    p.status = {ok: true, value: v}
-                    resolve(v)
-                  })
-                  .catch(e => {
-                    p.status = {ok: false, error: e}
-                    reject(e)
-                  })
-              } else {
-                status = {ok: true, value}
-                if(is_constructor_finished) {
-                  p.status = status
-                }
-                resolve(value)
-              }
-            },
-            (error) => {
-              status = {ok: false, error}
-              if(is_constructor_finished) {
-                p.status = status
-              }
-              reject(error)
-            },
-          )
         }
-      )
-      is_constructor_finished = true
-      p.status = status
-      return p
-    }
+
+    return _then.call(
+      this,
+      make_callback(on_resolve),
+      make_callback(on_reject),
+    )
   }
 
-  PromiseWithStatus.Original = window.Promise
-
-  window.Promise = PromiseWithStatus
+  window.Promise.__patched = true
 }