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// |reftest| skip-if(!xulRuntime.shell)
function property(key, value = key, shorthand = key === value) {
return { key, value, shorthand };
}
function assertDestrAssign(src, pattern) {
assertExpr(`(${src} = 0)`, aExpr("=", pattern, lit(0)));
}
function assertDestrBinding(src, pattern) {
assertDecl(`var ${src} = 0`, varDecl([{id: pattern, init: lit(0)}]));
}
function test() {
// Target expression must be a simple assignment target or a nested pattern
// in object assignment patterns.
assertDestrAssign("{...x}", objPatt([spread(ident("x"))]));
assertDestrAssign("{...(x)}", objPatt([spread(ident("x"))]));
assertDestrAssign("{...obj.p}", objPatt([spread(dotExpr(ident("obj"), ident("p")))]));
assertDestrAssign("{...{}}", objPatt([spread(objPatt([]))]));
assertDestrAssign("{...[]}", objPatt([spread(arrPatt([]))]));
// Object binding patterns only allow binding identifiers or nested patterns.
assertDestrBinding("{...x}", objPatt([spread(ident("x"))]));
assertDestrBinding("{...{}}", objPatt([spread(objPatt([]))]));
assertDestrBinding("{...[]}", objPatt([spread(arrPatt([]))]));
// The rest-property can be preceded by other properties.
for (var assertDestr of [assertDestrAssign, assertDestrBinding]) {
assertDestr("{a, ...x}", objPatt([property(ident("a")), spread(ident("x"))]));
assertDestr("{a: b, ...x}", objPatt([property(ident("a"), ident("b")), spread(ident("x"))]));
assertDestr("{[a]: b, ...x}", objPatt([property(comp(ident("a")), ident("b")), spread(ident("x"))]));
}
// Tests when __proto__ is used in the object pattern.
for (var assertDestr of [assertDestrAssign, assertDestrBinding]) {
assertDestr("{...__proto__}", objPatt([spread(ident("__proto__"))]));
assertDestr("{__proto__, ...x}", objPatt([property(ident("__proto__")), spread(ident("x"))]));
}
assertDestrAssign("{__proto__: a, ...x}", objPatt([property(lit("__proto__"), ident("a")), spread(ident("x"))]));
assertDestrBinding("{__proto__: a, ...x}", objPatt([property(ident("__proto__"), ident("a")), spread(ident("x"))]));
}
runtest(test);
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