| // |reftest| skip-if(!xulRuntime.shell) |
| function testNewTarget() { |
| |
| // new.target is currently valid inside any non-arrow, non-generator function |
| assertInFunctionExpr("new.target", newTarget()); |
| |
| // even with gratuitous whitespace. |
| assertInFunctionExpr(`new. |
| target`, newTarget()); |
| |
| // invalid in top-level scripts |
| assertError("new.target", SyntaxError); |
| |
| // valid in arrow functions inside functions |
| assertInFunctionExpr("()=>new.target", arrowExpr([], newTarget())); |
| assertError("(() => new.target))", SyntaxError); |
| |
| // valid in generators, too! |
| assertStmt("function *foo() { new.target; }", genFunDecl("es6", ident("foo"), [], |
| blockStmt([exprStmt(newTarget())]))); |
| |
| // new.target is a member expression. You should be able to call, invoke, or |
| // access properties of it. |
| assertInFunctionExpr("new.target.foo", dotExpr(newTarget(), ident("foo"))); |
| assertInFunctionExpr("new.target[\"foo\"]", memExpr(newTarget(), literal("foo"))); |
| |
| assertInFunctionExpr("new.target()", callExpr(newTarget(), [])); |
| assertInFunctionExpr("new new.target()", newExpr(newTarget(), [])); |
| |
| // assignment to newTarget is an error |
| assertError("new.target = 4", SyntaxError); |
| |
| // only new.target is a valid production, no shorn names or other names |
| assertError("new.", SyntaxError); |
| assertError("new.foo", SyntaxError); |
| assertError("new.targe", SyntaxError); |
| |
| // obj.new.target is still a member expression |
| assertExpr("obj.new.target", dotExpr(dotExpr(ident("obj"), ident("new")), ident("target"))); |
| } |
| |
| runtest(testNewTarget); |