ECMA-262 (12th Edition) ECMAScript 2021 Language Specification - page 5

running execution context

propKey

3. Let

scope

be the

's LexicalEnvironment.

4. Let

sourceText

be the source text matched by

GeneratorMethod

5. Let

closure

%GeneratorFunction.prototype%

sourceText

non-lexical-this

scope

6. Perform

MakeMethod

closure

object

7. Perform

closure

propKey

8. Let

prototype

be !

%GeneratorFunction.prototype.prototype%

(

9. Perform

(

closure

"prototype"

, PropertyDescriptor { [[Value]]:

prototype

, [[Writable]]:

true

, [[Enumerable]]:

false

, [[Configurable]]:

false

}).

10. Let

desc

be the PropertyDescriptor { [[Value]]:

closure

, [[Writable]]:

true

, [[Enumerable]]:

enumerable

[[Configurable]]:

true

11. Return ?

object

propKey

desc

AsyncGeneratorMethod

async

(

)

{

AsyncGeneratorBody

}

1. Let

propKey

be the result of evaluating

ReturnIfAbrupt

running execution context

propKey

3. Let

scope

be the

's LexicalEnvironment.

4. Let

sourceText

be the source text matched by

AsyncGeneratorMethod

5. Let

closure

be !

%AsyncGeneratorFunction.prototype%

(

sourceText

AsyncGeneratorBody

non-lexical-this

scope

6. Perform !

MakeMethod

(

closure

object

7. Perform !

closure

propKey

8. Let

prototype

be !

%AsyncGeneratorFunction.prototype.prototype%

(

9. Perform !

(

closure

"prototype"

, PropertyDescriptor { [[Value]]:

prototype

, [[Writable]]:

true

, [[Enumerable]]:

false

, [[Configurable]]:

false

}).

10. Let

desc

be PropertyDescriptor { [[Value]]:

closure

, [[Writable]]:

true

, [[Enumerable]]:

enumerable

[[Configurable]]:

true

11. Return ?

(

object

propKey

desc

AsyncMethod

async

(

)

{

AsyncFunctionBody

}

1. Let

propKey

be the result of evaluating

ReturnIfAbrupt

running execution context

propKey

3. Let

scope

be the LexicalEnvironment of the

4. Let

sourceText

be the source text matched by

AsyncMethod

5. Let

closure

be !

%AsyncFunction.prototype%

(

sourceText

AsyncFunctionBody

non-lexical-this

scope

6. Perform !

MakeMethod

(

closure

object

7. Perform !

closure

propKey

8. Let

desc

be the PropertyDescriptor { [[Value]]:

closure

, [[Writable]]:

true

, [[Enumerable]]:

enumerable

[[Configurable]]:

true

9. Return ?

(

object

propKey

desc

15.5 Generator Function Definitions

Syntax

403

are applied.

is present and the source code matching

strict mode code

, it is a Syntax

Error if the

StringValue

FunctionBodyContainsUseStrict

"eval"

"arguments"

It is a Syntax Error if

true

and

IsSimpleParameterList

false

It is a Syntax Error if any element of the

BoundNames

also occurs in the

LexicallyDeclaredNames

It is a Syntax Error if

YieldExpression

true

It is a Syntax Error if

SuperProperty

true

It is a Syntax Error if

SuperProperty

true

It is a Syntax Error if

SuperCall

true

It is a Syntax Error if

SuperCall

true

With parameters

functionObject

and

argumentsList

List

FunctionDeclarationInstantiation

FunctionBody

1. Perform ?

(

functionObject

argumentsList

2. Let

be ?

OrdinaryCreateFromConstructor

(

functionObject

"%GeneratorFunction.prototype.prototype%"

, «

[[GeneratorState]], [[GeneratorContext]], [[GeneratorBrand]] »).

3. Set

.[[GeneratorBrand]] to

empty

4. Perform

5. Return

{ [[Type]]:

return

, [[Value]]:

, [[Target]]:

empty

With parameter

scope

function

(

)

{

}

1. Let

name

StringValue

2. Let

sourceText

be the source text matched by

3. Let

%GeneratorFunction.prototype%

sourceText

non-lexical-this

scope

4. Perform

name

5. Let

prototype

be !

%GeneratorFunction.prototype.prototype%

(

6. Perform

(

"prototype"

, PropertyDescriptor { [[Value]]:

prototype

, [[Writable]]:

true

[[Enumerable]]:

false

, [[Configurable]]:

false

}).

7. Return

function

(

)

{

}

1. Let

sourceText

be the source text matched by

2. Let

%GeneratorFunction.prototype%

sourceText

non-lexical-this

scope

3. Perform

"default"

4. Let

prototype

be !