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diff --git a/js/src/builtin/temporal/ToString.h b/js/src/builtin/temporal/ToString.h
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+++ b/js/src/builtin/temporal/ToString.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef builtin_temporal_ToString_h
+#define builtin_temporal_ToString_h
+
+#include "builtin/temporal/Temporal.h"
+#include "builtin/temporal/TemporalRoundingMode.h"
+#include "builtin/temporal/TemporalUnit.h"
+#include "js/TypeDecls.h"
+
+namespace js::temporal {
+
+class CalendarValue;
+class InstantObject;
+class PlainDateObject;
+class PlainMonthDayObject;
+class PlainYearMonthObject;
+class TimeZoneValue;
+class ZonedDateTime;
+
+struct PlainDateTime;
+struct PlainTime;
+
+/**
+ * TemporalInstantToString ( instant, timeZone, precision )
+ */
+JSString* TemporalInstantToString(JSContext* cx,
+                                  JS::Handle<InstantObject*> instant,
+                                  JS::Handle<TimeZoneValue> timeZone,
+                                  Precision precision);
+
+/**
+ * TemporalDateToString ( temporalDate, showCalendar )
+ */
+JSString* TemporalDateToString(JSContext* cx,
+                               JS::Handle<PlainDateObject*> temporalDate,
+                               CalendarOption showCalendar);
+
+/**
+ * TemporalDateTimeToString ( isoYear, isoMonth, isoDay, hour, minute, second,
+ * millisecond, microsecond, nanosecond, calendar, precision, showCalendar )
+ */
+JSString* TemporalDateTimeToString(JSContext* cx, const PlainDateTime& dateTime,
+                                   JS::Handle<CalendarValue> calendar,
+                                   Precision precision,
+                                   CalendarOption showCalendar);
+
+/**
+ * TemporalTimeToString ( hour, minute, second, millisecond, microsecond,
+ * nanosecond, precision )
+ */
+JSString* TemporalTimeToString(JSContext* cx, const PlainTime& time,
+                               Precision precision);
+
+/**
+ * TemporalMonthDayToString ( monthDay, showCalendar )
+ */
+JSString* TemporalMonthDayToString(JSContext* cx,
+                                   JS::Handle<PlainMonthDayObject*> monthDay,
+                                   CalendarOption showCalendar);
+
+/**
+ * TemporalYearMonthToString ( yearMonth, showCalendar )
+ */
+JSString* TemporalYearMonthToString(JSContext* cx,
+                                    JS::Handle<PlainYearMonthObject*> yearMonth,
+                                    CalendarOption showCalendar);
+
+/**
+ * TemporalZonedDateTimeToString ( zonedDateTime, precision, showCalendar,
+ * showTimeZone, showOffset [ , increment, unit, roundingMode ] )
+ */
+JSString* TemporalZonedDateTimeToString(
+    JSContext* cx, JS::Handle<ZonedDateTime> zonedDateTime, Precision precision,
+    CalendarOption showCalendar, TimeZoneNameOption showTimeZone,
+    ShowOffsetOption showOffset, Increment increment = Increment{1},
+    TemporalUnit unit = TemporalUnit::Nanosecond,
+    TemporalRoundingMode roundingMode = TemporalRoundingMode::Trunc);
+
+} /* namespace js::temporal */
+
+#endif /* builtin_temporal_ToString_h */