Tests for ES6 class name semantics in class statements and expressions

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Class statement
PASS A:::ReferenceError: Can't find variable: A
PASS 'use strict'; A:::ReferenceError: Can't find variable: A
PASS class {}:::SyntaxError: Class statements must have a name.
PASS 'use strict'; class {}:::SyntaxError: Class statements must have a name.
PASS class { constructor() {} }:::SyntaxError: Class statements must have a name.
PASS 'use strict'; class { constructor() {} }:::SyntaxError: Class statements must have a name.
PASS class A { constructor() {} }
PASS 'use strict'; class A { constructor() {} }
PASS class A { constructor() {} }; A.toString():::'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; A.toString():::'class A { constructor() {} }'
PASS class A { constructor() {} }; (new A) instanceof A
PASS 'use strict'; class A { constructor() {} }; (new A) instanceof A
PASS class A { constructor() { this.base = A; } }; (new A).base.toString():::'class A { constructor() { this.base = A; } }'
PASS 'use strict'; class A { constructor() { this.base = A; } }; (new A).base.toString():::'class A { constructor() { this.base = A; } }'
PASS class A { constructor() {} }; class B extends A {};
PASS 'use strict'; class A { constructor() {} }; class B extends A {};
PASS class A { constructor() {} }; class B extends A { constructor() {} }; B.toString():::'class B extends A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() {} }; B.toString():::'class B extends A { constructor() {} }'
PASS class A { constructor() {} }; class B extends A {}; (new B) instanceof A
PASS 'use strict'; class A { constructor() {} }; class B extends A {}; (new B) instanceof A
PASS class A { constructor() {} }; class B extends A {}; (new B) instanceof B
PASS 'use strict'; class A { constructor() {} }; class B extends A {}; (new B) instanceof B
PASS class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).base.toString():::'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).base.toString():::'class A { constructor() {} }'
PASS class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).derived.toString():::'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).derived.toString():::'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'

Class expression
PASS A:::ReferenceError: Can't find variable: A
PASS 'use strict'; A:::ReferenceError: Can't find variable: A
PASS (class {})
PASS 'use strict'; (class {})
PASS (class { constructor(){} })
PASS 'use strict'; (class { constructor(){} })
PASS typeof (class {}):::"function"
PASS 'use strict'; typeof (class {}):::"function"
PASS (class A {})
PASS 'use strict'; (class A {})
PASS typeof (class A {}):::"function"
PASS 'use strict'; typeof (class A {}):::"function"
PASS (class A {}); A:::ReferenceError: Can't find variable: A
PASS 'use strict'; (class A {}); A:::ReferenceError: Can't find variable: A
PASS new (class A {})
PASS 'use strict'; new (class A {})
PASS typeof (new (class A {})):::"object"
PASS 'use strict'; typeof (new (class A {})):::"object"
PASS (new (class A { constructor() { this.base = A; } })).base
PASS 'use strict'; (new (class A { constructor() { this.base = A; } })).base
PASS (new (class A { constructor() { this.base = A; } })).base.toString():::"class A { constructor() { this.base = A; } }"
PASS 'use strict'; (new (class A { constructor() { this.base = A; } })).base.toString():::"class A { constructor() { this.base = A; } }"
PASS class A {}; (class B extends A {})
PASS 'use strict'; class A {}; (class B extends A {})
PASS class A {}; (class B extends A {}); B:::ReferenceError: Can't find variable: B
PASS 'use strict'; class A {}; (class B extends A {}); B:::ReferenceError: Can't find variable: B
PASS class A {}; new (class B extends A {})
PASS 'use strict'; class A {}; new (class B extends A {})
PASS class A {}; new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })
PASS 'use strict'; class A {}; new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })
PASS class A {}; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })) instanceof A
PASS 'use strict'; class A {}; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })) instanceof A
PASS class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).base.toString():::'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).base.toString():::'class A { constructor() {} }'
PASS class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).derived.toString():::'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'
PASS 'use strict'; class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).derived.toString():::'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'

Class expression assignment to variable
PASS A:::ReferenceError: Can't find variable: A
PASS 'use strict'; A:::ReferenceError: Can't find variable: A
PASS var VarA = class {}
PASS 'use strict'; var VarA = class {}
PASS var VarA = class { constructor() {} }; VarA.toString():::'class { constructor() {} }'
PASS 'use strict'; var VarA = class { constructor() {} }; VarA.toString():::'class { constructor() {} }'
PASS VarA:::ReferenceError: Can't find variable: VarA
PASS 'use strict'; VarA:::ReferenceError: Can't find variable: VarA
PASS var VarA = class A { constructor() {} }
PASS 'use strict'; var VarA = class A { constructor() {} }
PASS var VarA = class A { constructor() {} }; VarA.toString():::'class A { constructor() {} }'
PASS 'use strict'; var VarA = class A { constructor() {} }; VarA.toString():::'class A { constructor() {} }'
PASS var VarA = class A { constructor() {} }; A.toString():::ReferenceError: Can't find variable: A
PASS 'use strict'; var VarA = class A { constructor() {} }; A.toString():::ReferenceError: Can't find variable: A
PASS var VarA = class A { constructor() {} }; (new VarA) instanceof VarA
PASS 'use strict'; var VarA = class A { constructor() {} }; (new VarA) instanceof VarA
PASS var VarA = class A { constructor() { this.base = A; } }; (new VarA).base.toString():::'class A { constructor() { this.base = A; } }'
PASS 'use strict'; var VarA = class A { constructor() { this.base = A; } }; (new VarA).base.toString():::'class A { constructor() { this.base = A; } }'
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} };
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} };
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; B:::ReferenceError: Can't find variable: B
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; B:::ReferenceError: Can't find variable: B
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; VarB.toString():::'class B extends VarA { constructor() {} }'
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; VarB.toString():::'class B extends VarA { constructor() {} }'
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarA
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarA
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarB
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarB
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).base === VarA
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).base === VarA
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derived === VarB
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derived === VarB
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derivedVar === VarB
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derivedVar === VarB

Class statement binding in other circumstances
PASS var result = A; result:::ReferenceError: Can't find variable: A
PASS 'use strict'; var result = A; result:::ReferenceError: Can't find variable: A
PASS var result = A; class A {}; result:::ReferenceError: Cannot access uninitialized variable.
PASS 'use strict'; var result = A; class A {}; result:::ReferenceError: Cannot access uninitialized variable.
PASS class A { constructor() { A = 1; } }; new A:::TypeError: Attempted to assign to readonly property.
PASS 'use strict'; class A { constructor() { A = 1; } }; new A:::TypeError: Attempted to assign to readonly property.
PASS class A { constructor() { } }; A = 1; A:::1
PASS 'use strict'; class A { constructor() { } }; A = 1; A:::1
PASS class A {}; var result = A; result
PASS 'use strict'; class A {}; var result = A; result
PASS eval('var Foo = 10'); Foo:::10
PASS 'use strict'; eval('var Foo = 10'); Foo:::ReferenceError: Can't find variable: Foo
PASS eval('class Bar { constructor() {} }; Bar.toString()');:::'class Bar { constructor() {} }'
PASS 'use strict'; eval('class Bar { constructor() {} }'); Bar.toString():::ReferenceError: Can't find variable: Bar
PASS successfullyParsed

TEST COMPLETE