json-output: Extended detail for unknown outputs

internal/command/jsonplan/plan.go

@@ -442,7 +442,8 @@ func (p *plan) marshalOutputChanges(changes *plans.Changes) error {
 		changeV.After, _ = changeV.After.UnmarkDeep()
 
 		var before, after []byte
-		afterUnknown := cty.False
+		var afterUnknown cty.Value
+
 		if changeV.Before != cty.NilVal {
 			before, err = ctyjson.Marshal(changeV.Before, changeV.Before.Type())
 			if err != nil {
@@ -455,8 +456,18 @@ func (p *plan) marshalOutputChanges(changes *plans.Changes) error {
 				if err != nil {
 					return err
 				}
+				afterUnknown = cty.False
 			} else {
-				afterUnknown = cty.True
+				filteredAfter := omitUnknowns(changeV.After)
+				if filteredAfter.IsNull() {
+					after = nil
+				} else {
+					after, err = ctyjson.Marshal(filteredAfter, filteredAfter.Type())
+					if err != nil {
+						return err
+					}
+				}
+				afterUnknown = unknownAsBool(changeV.After)
 			}
 		}
 

internal/command/testdata/show-json/unknown-output/main.tf

@@ -0,0 +1,19 @@
+output "foo" {
+  value = "hello"
+}
+
+output "bar" {
+  value = tolist([
+    "hello",
+    timestamp(),
+    "world",
+  ])
+}
+
+output "baz" {
+  value = {
+    greeting: "hello",
+    time: timestamp(),
+    subject: "world",
+  }
+}

internal/command/testdata/show-json/unknown-output/output.json

@@ -0,0 +1,96 @@
+{
+  "format_version": "1.1",
+  "terraform_version": "1.3.0-dev",
+  "planned_values": {
+    "outputs": {
+      "bar": {
+        "sensitive": false
+      },
+      "baz": {
+        "sensitive": false
+      },
+      "foo": {
+        "sensitive": false,
+        "type": "string",
+        "value": "hello"
+      }
+    },
+    "root_module": {}
+  },
+  "output_changes": {
+    "bar": {
+      "actions": [
+        "create"
+      ],
+      "before": null,
+      "after": [
+        "hello",
+        null,
+        "world"
+      ],
+      "after_unknown": [
+        false,
+        true,
+        false
+      ],
+      "before_sensitive": false,
+      "after_sensitive": false
+    },
+    "baz": {
+      "actions": [
+        "create"
+      ],
+      "before": null,
+      "after": {
+        "greeting": "hello",
+        "subject": "world"
+      },
+      "after_unknown": {
+        "time": true
+      },
+      "before_sensitive": false,
+      "after_sensitive": false
+    },
+    "foo": {
+      "actions": [
+        "create"
+      ],
+      "before": null,
+      "after": "hello",
+      "after_unknown": false,
+      "before_sensitive": false,
+      "after_sensitive": false
+    }
+  },
+  "prior_state": {
+    "format_version": "1.0",
+    "terraform_version": "1.3.0",
+    "values": {
+      "outputs": {
+        "foo": {
+          "sensitive": false,
+          "value": "hello",
+          "type": "string"
+        }
+      },
+      "root_module": {}
+    }
+  },
+  "configuration": {
+    "root_module": {
+      "outputs": {
+        "bar": {
+          "expression": {}
+        },
+        "baz": {
+          "expression": {}
+        },
+        "foo": {
+          "expression": {
+            "constant_value": "hello"
+          }
+        }
+      }
+    }
+  }
+}