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// |reftest| async
// This file was procedurally generated from the following sources:
// - src/class-elements/prod-private-async-generator.case
// - src/class-elements/private-methods/cls-decl.template
/*---
description: Private Async Generator (private method definitions in a class declaration)
esid: prod-MethodDefinition
features: [async-iteration, class, class-methods-private]
flags: [generated, async]
info: |
ClassElement :
MethodDefinition
...
;
ClassElementName :
PropertyName
PrivateName
PrivateName ::
# IdentifierName
MethodDefinition :
ClassElementName ( UniqueFormalParameters ) { FunctionBody }
GeneratorMethod
AsyncMethod
AsyncGeneratorMethod
get ClassElementName () { FunctionBody }
set ClassElementName ( PropertySetParameterList ) { FunctionBody }
GeneratorMethod :
* ClassElementName ( UniqueFormalParameters ){GeneratorBody}
AsyncMethod :
async [no LineTerminator here] ClassElementName ( UniqueFormalParameters ) { AsyncFunctionBody }
AsyncGeneratorMethod :
async [no LineTerminator here]* ClassElementName ( UniqueFormalParameters ) { AsyncGeneratorBody }
---
InitializeClassElements ( F, proto )
...
5. For each item element in order from elements,
a. Assert: If element.[[Placement]] is "prototype" or "static", then element.[[Key]] is not a Private Name.
b. If element.[[Kind]] is "method" and element.[[Placement]] is "static" or "prototype",
i. Let receiver be F if element.[[Placement]] is "static", else let receiver be proto.
ii. Perform ? DefineClassElement(receiver, element).
InitializeInstanceElements ( O, constructor )
...
3. Let elements be the value of F's [[Elements]] internal slot.
4. For each item element in order from elements,
a. If element.[[Placement]] is "own" and element.[[Kind]] is "method",
i. Perform ? DefineClassElement(O, element).
DefineClassElement (receiver, element)
...
6. If key is a Private Name,
a. Perform ? PrivateFieldDefine(receiver, key, descriptor).
PrivateFieldDefine (P, O, desc)
...
6. Append { [[PrivateName]]: P, [[PrivateFieldDescriptor]]: desc } to O.[[PrivateFieldDescriptors]].
---*/
var ctorPromise;
/*** template notes
* method should always be #m
* the template provides c.ref() for external reference
*/
function hasProp(obj, name, expected, msg) {
var hasOwnProperty = Object.prototype.hasOwnProperty.call(obj, name);
assert.sameValue(hasOwnProperty, expected, msg);
var hasProperty = Reflect.has(obj, name);
assert.sameValue(hasProperty, expected, msg);
}
class C {
async * #m() { return 42; }
get ref() { return this.#m; }
constructor() {
hasProp(this, '#m', false, 'private methods are defined in an special internal slot and cannot be found as own properties');
assert.sameValue(typeof this.#m, 'function');
assert.sameValue(this.ref, this.#m, 'returns the same value');
assert.sameValue(this.#m, (() => this)().#m, 'memberexpression and call expression forms');
var ctorIter = this.#m();
var p = ctorIter.next();
ctorPromise = p.then(({ value, done }) => {
assert.sameValue(value, 42, 'return from generator method, inside ctor');
assert.sameValue(done, true, 'iterator is done, inside ctor');
}, $DONE);
assert.sameValue(this.#m.name, '#m', 'function name inside constructor');
}
}
var c = new C();
var other = new C();
hasProp(C.prototype, '#m', false, 'method is not defined in the prototype');
hasProp(C, '#m', false, 'method is not defined in the contructor');
hasProp(c, '#m', false, 'method cannot be seen outside of the class');
/***
* MethodDefinition : ClassElementName ( UniqueFormalParameters ) { FunctionBody }
*
* 1. Let methodDef be DefineMethod of MethodDefinition with argument homeObject.
* ...
*/
assert.sameValue(c.ref, other.ref, 'The method is defined once, and reused on every new instance');
assert.sameValue(c.ref.name, '#m', 'function name is preserved external reference');
ctorPromise.then(() => {
// gets the returned async iterator from #m
var iter = c.ref();
return iter.next().then(({ value, done }) => {
assert.sameValue(value, 42, 'return from generator method');
assert.sameValue(done, true, 'iterator is done');
});
}).then($DONE, $DONE);
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