From 04e2d215a1aec0aeecd9a1b43265d96deb18bf7f Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Thu, 15 Jul 2021 23:57:07 +0100
Subject: [PATCH] LibJS: Implement Temporal.Duration.prototype.microseconds

---
 .../Libraries/LibJS/Runtime/CommonPropertyNames.h  |  1 +
 .../LibJS/Runtime/Temporal/DurationPrototype.cpp   | 14 ++++++++++++++
 .../LibJS/Runtime/Temporal/DurationPrototype.h     |  1 +
 .../Duration/Duration.prototype.microseconds.js    | 14 ++++++++++++++
 4 files changed, 30 insertions(+)
 create mode 100644 Userland/Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.microseconds.js

diff --git a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
index a341e61499..4a8f7bf19e 100644
--- a/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
+++ b/Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
@@ -237,6 +237,7 @@ namespace JS {
     P(map)                                   \
     P(max)                                   \
     P(message)                               \
+    P(microseconds)                          \
     P(milliseconds)                          \
     P(min)                                   \
     P(minutes)                               \
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
index e1fb08dc6d..7277bcac20 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
@@ -33,6 +33,7 @@ void DurationPrototype::initialize(GlobalObject& global_object)
     define_native_accessor(vm.names.minutes, minutes_getter, {}, Attribute::Configurable);
     define_native_accessor(vm.names.seconds, seconds_getter, {}, Attribute::Configurable);
     define_native_accessor(vm.names.milliseconds, milliseconds_getter, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.microseconds, microseconds_getter, {}, Attribute::Configurable);
 }
 
 static Duration* typed_this(GlobalObject& global_object)
@@ -152,4 +153,17 @@ JS_DEFINE_NATIVE_FUNCTION(DurationPrototype::milliseconds_getter)
     return Value(duration->milliseconds());
 }
 
+// 7.3.11 get Temporal.Duration.prototype.microseconds, https://tc39.es/proposal-temporal/#sec-get-temporal.duration.prototype.microseconds
+JS_DEFINE_NATIVE_FUNCTION(DurationPrototype::microseconds_getter)
+{
+    // 1. Let duration be the this value.
+    // 2. Perform ? RequireInternalSlot(duration, [[InitializedTemporalDuration]]).
+    auto* duration = typed_this(global_object);
+    if (vm.exception())
+        return {};
+
+    // 3. Return duration.[[Microseconds]].
+    return Value(duration->microseconds());
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.h
index cad8729ab6..2ca56107f9 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.h
@@ -27,6 +27,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(minutes_getter);
     JS_DECLARE_NATIVE_FUNCTION(seconds_getter);
     JS_DECLARE_NATIVE_FUNCTION(milliseconds_getter);
+    JS_DECLARE_NATIVE_FUNCTION(microseconds_getter);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.microseconds.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.microseconds.js
new file mode 100644
index 0000000000..8abf810aef
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.microseconds.js
@@ -0,0 +1,14 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const duration = new Temporal.Duration(0, 0, 0, 0, 0, 0, 0, 0, 123);
+        expect(duration.microseconds).toBe(123);
+    });
+});
+
+test("errors", () => {
+    test("this value must be a Temporal.Duration object", () => {
+        expect(() => {
+            Reflect.get(Temporal.Duration.prototype, "microseconds", "foo");
+        }).toThrowWithMessage(TypeError, "Not a Temporal.Duration");
+    });
+});