render nested causes in Cause.pretty (#3246)

Effect-TS · Jul 13, 2024 · eb1c4d4 · eb1c4d4
1 parent 42aec0e
commit eb1c4d4
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diff --git a/.changeset/witty-snails-smile.md b/.changeset/witty-snails-smile.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+render nested causes in Cause.pretty
diff --git a/packages/effect/src/internal/cause.ts b/packages/effect/src/internal/cause.ts
@@ -990,6 +990,9 @@ const renderErrorCause = (cause: PrettyError, prefix: string) => {
   for (let i = 1, len = lines.length; i < len; i++) {
     stack += `\n${prefix}${lines[i]}`
   }
+  if (cause.cause) {
+    stack += ` {\n${renderErrorCause(cause.cause as PrettyError, `${prefix}  `)}\n${prefix}}`
+  }
   return stack
 }
 

diff --git a/packages/effect/test/Effect/cause-rendering.test.ts b/packages/effect/test/Effect/cause-rendering.test.ts
@@ -164,4 +164,17 @@ message
       const pretty = Cause.pretty(cause, { renderErrorCause: true })
       assert.include(pretty, "[cause]: Error: child")
     }))
+
+  it.effect("pretty nested cause", () =>
+    Effect.gen(function*() {
+      const cause = yield* Effect.fail(
+        new Error("parent", { cause: new Error("child", { cause: new Error("child2") }) })
+      ).pipe(
+        Effect.sandbox,
+        Effect.flip
+      )
+      const pretty = Cause.pretty(cause, { renderErrorCause: true })
+      assert.include(pretty, "[cause]: Error: child")
+      assert.include(pretty, "[cause]: Error: child2")
+    }))
 })