JS_ConstructObject
as of spidermonkey 1.8.8, js_constructobject and js_constructobjectwitharguments have been removed from the jsapi.
... syntax jsobject * js_constructobject(jscontext *cx, jsclass *clasp, jsobject *proto, jsobject *parent); jsobject * js_constructobjectwitharguments(jscontext *cx, jsclass *clasp, jsobject *proto, jsobject *parent, unsigned int argc, jsval *argv); name type description cx jscontext * the context in which to create the new object.
... argc unsigned int (only in js_constructobjectwitharguments) the number of arguments to pass to the constructor.
...And 2 more matches

JS_DefineObject
use js_constructobject, js_constructobjectwitharguments, or js_newobject to create a new object without storing it in a property of another object.

JSAPI reference
in spidermonkey 6 obsolete since jsapi 13 objects typedef jsobject js_defineobject js_newobject js_newplainobject added in spidermonkey 38 js_newobjectforconstructor added in spidermonkey 1.8.5 js_newglobalobject added in spidermonkey 1.8 js_newobjectwithgivenproto js_new added in spidermonkey 1.8 js_isglobalobject added in jsapi 24 js_constructobject obsolete since jsapi 16 js_constructobjectwitharguments obsolete since jsapi 16 js_getclass js_getobjectprototype added in jsapi 17 js_getfunctionprototype added in spidermonkey 17 js_getarrayprototype added in spidermonkey 24 js_getconstructor js_getglobalforobject js_getinstanceprivate js_getprototype js_setprototype js_getprivate js_setprivate js_freezeobject added in spidermonkey 1.8.5 js_deepfreezeobject added in spidermonkey 1.8.

SpiderMonkey 1.8.8
deleted apis js_get_class (use js_getclass instead) js_constructobject and js_constructobjectwitharguments (preferably use js_new instead, or use this reimplementation as a short-term fix) js_newcompartmentandglobalobject (use js_newglobalobject instead.) jspd_argument jsval_is_object() (use !jsval_is_primitive(v) to detect objects and jsval_is_null(v) to detect null).

SpiderMonkey 17
deleted apis js_get_class (use js_getclass instead) js_constructobject and js_constructobjectwitharguments (preferably use js_new instead, or use this reimplementation as a short-term fix) js_newcompartmentandglobalobject (use js_newglobalobject instead.) jspd_argument jsval_is_object() (use !jsval_is_primitive(v) to detect objects and jsval_is_null(v) to detect null).