newTarget.js - mozsearch

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// |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);