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<!doctype html>
<meta charset="utf8">
<link rel="stylesheet" href="./spec.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css">
<script src="./spec.js"></script>
<pre class="metadata">
title: ECMAScript Module Phase Imports
stage: 2
contributors: Luca Casonato, Guy Bedford
</pre>
<emu-clause id="sec-ecmascript-data-types-and-values" aoid="Type">
<h1>ECMAScript Data Types and Values</h1>
<emu-clause id="sec-ecmascript-language-types">
<h1>ECMAScript Language Types</h1>
<emu-clause id="sec-object-type">
<h1>Object Type</h1>
<emu-clause id="sec-well-known-intrinsic-objects">
<h1>Well-Known Intrinsic Objects</h1>
<p>Well-known intrinsics are built-in objects that are explicitly referenced by the algorithms of this specification and which usually have realm-specific identities. Unless otherwise specified each intrinsic object actually corresponds to a set of similar objects, one per realm.</p>
<p>Within this specification a reference such as %name% means the intrinsic object, associated with the current realm, corresponding to the name. A reference such as %name.a.b% means, as if the *"b"* property of the value of the *"a"* property of the intrinsic object %name% was accessed prior to any ECMAScript code being evaluated. Determination of the current realm and its intrinsics is described in <emu-xref href="#sec-execution-contexts"></emu-xref>. The well-known intrinsics are listed in <emu-xref href="#table-well-known-intrinsic-objects"></emu-xref>.</p>
<emu-table id="table-well-known-intrinsic-objects" caption="Well-Known Intrinsic Objects" oldids="table-7">
<table>
<tr>
<th>
Intrinsic Name
</th>
<th>
Global Name
</th>
<th>
ECMAScript Language Association
</th>
</tr>
<tr>
<td>
%AbstractModuleSource%
</td>
<td>
</td>
<td>
The %AbstractModuleSource% constructor (<emu-xref href="#sec-%abstractmodulesource%-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AggregateError%
</td>
<td>
`AggregateError`
</td>
<td>
The `AggregateError` constructor (<emu-xref href="#sec-aggregate-error-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Array%
</td>
<td>
`Array`
</td>
<td>
The Array constructor (<emu-xref href="#sec-array-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%ArrayBuffer%
</td>
<td>
`ArrayBuffer`
</td>
<td>
The ArrayBuffer constructor (<emu-xref href="#sec-arraybuffer-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%ArrayIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of Array iterator objects (<emu-xref href="#sec-array-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AsyncFromSyncIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of async-from-sync iterator objects (<emu-xref href="#sec-async-from-sync-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AsyncFunction%
</td>
<td>
</td>
<td>
The constructor of async function objects (<emu-xref href="#sec-async-function-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AsyncGeneratorFunction%
</td>
<td>
</td>
<td>
The constructor of async generator function objects (<emu-xref href="#sec-asyncgeneratorfunction-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AsyncGeneratorPrototype%
</td>
<td>
</td>
<td>
The prototype of async generator objects (<emu-xref href="#sec-asyncgenerator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%AsyncIteratorPrototype%
</td>
<td>
</td>
<td>
An object that all standard built-in async iterator objects indirectly inherit from
</td>
</tr>
<tr>
<td>
%Atomics%
</td>
<td>
`Atomics`
</td>
<td>
The `Atomics` object (<emu-xref href="#sec-atomics-object"></emu-xref>)
</td>
</tr>
<tr>
<td>
%BigInt%
</td>
<td>
`BigInt`
</td>
<td>
The BigInt constructor (<emu-xref href="#sec-bigint-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%BigInt64Array%
</td>
<td>
`BigInt64Array`
</td>
<td>
The BigInt64Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%BigUint64Array%
</td>
<td>
`BigUint64Array`
</td>
<td>
The BigUint64Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Boolean%
</td>
<td>
`Boolean`
</td>
<td>
The Boolean constructor (<emu-xref href="#sec-boolean-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%DataView%
</td>
<td>
`DataView`
</td>
<td>
The DataView constructor (<emu-xref href="#sec-dataview-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Date%
</td>
<td>
`Date`
</td>
<td>
The Date constructor (<emu-xref href="#sec-date-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%decodeURI%
</td>
<td>
`decodeURI`
</td>
<td>
The `decodeURI` function (<emu-xref href="#sec-decodeuri-encodeduri"></emu-xref>)
</td>
</tr>
<tr>
<td>
%decodeURIComponent%
</td>
<td>
`decodeURIComponent`
</td>
<td>
The `decodeURIComponent` function (<emu-xref href="#sec-decodeuricomponent-encodeduricomponent"></emu-xref>)
</td>
</tr>
<tr>
<td>
%encodeURI%
</td>
<td>
`encodeURI`
</td>
<td>
The `encodeURI` function (<emu-xref href="#sec-encodeuri-uri"></emu-xref>)
</td>
</tr>
<tr>
<td>
%encodeURIComponent%
</td>
<td>
`encodeURIComponent`
</td>
<td>
The `encodeURIComponent` function (<emu-xref href="#sec-encodeuricomponent-uricomponent"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Error%
</td>
<td>
`Error`
</td>
<td>
The Error constructor (<emu-xref href="#sec-error-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%eval%
</td>
<td>
`eval`
</td>
<td>
The `eval` function (<emu-xref href="#sec-eval-x"></emu-xref>)
</td>
</tr>
<tr>
<td>
%EvalError%
</td>
<td>
`EvalError`
</td>
<td>
The EvalError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-evalerror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%FinalizationRegistry%
</td>
<td>
`FinalizationRegistry`
</td>
<td>
The FinalizationRegistry constructor (<emu-xref href="#sec-finalization-registry-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Float32Array%
</td>
<td>
`Float32Array`
</td>
<td>
The Float32Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Float64Array%
</td>
<td>
`Float64Array`
</td>
<td>
The Float64Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%ForInIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of For-In iterator objects (<emu-xref href="#sec-for-in-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Function%
</td>
<td>
`Function`
</td>
<td>
The Function constructor (<emu-xref href="#sec-function-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%GeneratorFunction%
</td>
<td>
</td>
<td>
The constructor of generator function objects (<emu-xref href="#sec-generatorfunction-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%GeneratorPrototype%
</td>
<td>
</td>
<td>
The prototype of generator objects (<emu-xref href="#sec-generator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Int8Array%
</td>
<td>
`Int8Array`
</td>
<td>
The Int8Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Int16Array%
</td>
<td>
`Int16Array`
</td>
<td>
The Int16Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Int32Array%
</td>
<td>
`Int32Array`
</td>
<td>
The Int32Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%isFinite%
</td>
<td>
`isFinite`
</td>
<td>
The `isFinite` function (<emu-xref href="#sec-isfinite-number"></emu-xref>)
</td>
</tr>
<tr>
<td>
%isNaN%
</td>
<td>
`isNaN`
</td>
<td>
The `isNaN` function (<emu-xref href="#sec-isnan-number"></emu-xref>)
</td>
</tr>
<tr>
<td>
%IteratorPrototype%
</td>
<td>
</td>
<td>
An object that all standard built-in iterator objects indirectly inherit from
</td>
</tr>
<tr>
<td>
%JSON%
</td>
<td>
`JSON`
</td>
<td>
The `JSON` object (<emu-xref href="#sec-json-object"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Map%
</td>
<td>
`Map`
</td>
<td>
The Map constructor (<emu-xref href="#sec-map-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%MapIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of Map iterator objects (<emu-xref href="#sec-map-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Math%
</td>
<td>
`Math`
</td>
<td>
The `Math` object (<emu-xref href="#sec-math-object"></emu-xref>)
</td>
</tr>
<tr>
<td>
<ins>%ModuleSource%</ins>
</td>
<td>
<ins>`ModuleSource`</ins>
</td>
<td>
<ins>A `ModuleSource` object (<emu-xref href="#sec-module-source-object"></emu-xref>)</ins>
</td>
</tr>
<tr>
<td>
%Number%
</td>
<td>
`Number`
</td>
<td>
The Number constructor (<emu-xref href="#sec-number-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Object%
</td>
<td>
`Object`
</td>
<td>
The Object constructor (<emu-xref href="#sec-object-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%parseFloat%
</td>
<td>
`parseFloat`
</td>
<td>
The `parseFloat` function (<emu-xref href="#sec-parsefloat-string"></emu-xref>)
</td>
</tr>
<tr>
<td>
%parseInt%
</td>
<td>
`parseInt`
</td>
<td>
The `parseInt` function (<emu-xref href="#sec-parseint-string-radix"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Promise%
</td>
<td>
`Promise`
</td>
<td>
The Promise constructor (<emu-xref href="#sec-promise-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Proxy%
</td>
<td>
`Proxy`
</td>
<td>
The Proxy constructor (<emu-xref href="#sec-proxy-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%RangeError%
</td>
<td>
`RangeError`
</td>
<td>
The RangeError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-rangeerror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%ReferenceError%
</td>
<td>
`ReferenceError`
</td>
<td>
The ReferenceError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-referenceerror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Reflect%
</td>
<td>
`Reflect`
</td>
<td>
The `Reflect` object (<emu-xref href="#sec-reflect-object"></emu-xref>)
</td>
</tr>
<tr>
<td>
%RegExp%
</td>
<td>
`RegExp`
</td>
<td>
The RegExp constructor (<emu-xref href="#sec-regexp-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%RegExpStringIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of RegExp String Iterator objects (<emu-xref href="#sec-regexp-string-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Set%
</td>
<td>
`Set`
</td>
<td>
The Set constructor (<emu-xref href="#sec-set-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%SetIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of Set iterator objects (<emu-xref href="#sec-set-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%SharedArrayBuffer%
</td>
<td>
`SharedArrayBuffer`
</td>
<td>
The SharedArrayBuffer constructor (<emu-xref href="#sec-sharedarraybuffer-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%String%
</td>
<td>
`String`
</td>
<td>
The String constructor (<emu-xref href="#sec-string-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%StringIteratorPrototype%
</td>
<td>
</td>
<td>
The prototype of String iterator objects (<emu-xref href="#sec-string-iterator-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Symbol%
</td>
<td>
`Symbol`
</td>
<td>
The Symbol constructor (<emu-xref href="#sec-symbol-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%SyntaxError%
</td>
<td>
`SyntaxError`
</td>
<td>
The SyntaxError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-syntaxerror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%ThrowTypeError%
</td>
<td>
</td>
<td>
A function object that unconditionally throws a new instance of %TypeError%
</td>
</tr>
<tr>
<td>
%TypedArray%
</td>
<td>
</td>
<td>
The super class of all typed Array constructors (<emu-xref href="#sec-%typedarray%-intrinsic-object"></emu-xref>)
</td>
</tr>
<tr>
<td>
%TypeError%
</td>
<td>
`TypeError`
</td>
<td>
The TypeError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-typeerror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Uint8Array%
</td>
<td>
`Uint8Array`
</td>
<td>
The Uint8Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Uint8ClampedArray%
</td>
<td>
`Uint8ClampedArray`
</td>
<td>
The Uint8ClampedArray constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Uint16Array%
</td>
<td>
`Uint16Array`
</td>
<td>
The Uint16Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%Uint32Array%
</td>
<td>
`Uint32Array`
</td>
<td>
The Uint32Array constructor (<emu-xref href="#sec-typedarray-objects"></emu-xref>)
</td>
</tr>
<tr>
<td>
%URIError%
</td>
<td>
`URIError`
</td>
<td>
The URIError constructor (<emu-xref href="#sec-native-error-types-used-in-this-standard-urierror"></emu-xref>)
</td>
</tr>
<tr>
<td>
%WeakMap%
</td>
<td>
`WeakMap`
</td>
<td>
The WeakMap constructor (<emu-xref href="#sec-weakmap-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%WeakRef%
</td>
<td>
`WeakRef`
</td>
<td>
The WeakRef constructor (<emu-xref href="#sec-weak-ref-constructor"></emu-xref>)
</td>
</tr>
<tr>
<td>
%WeakSet%
</td>
<td>
`WeakSet`
</td>
<td>
The WeakSet constructor (<emu-xref href="#sec-weakset-constructor"></emu-xref>)
</td>
</tr>
</table>
</emu-table>
<emu-note>
<p>Additional entries in <emu-xref href="#table-additional-well-known-intrinsic-objects"></emu-xref>.</p>
</emu-note>
</emu-clause>
</emu-clause>
</emu-clause>
</emu-clause>
<emu-clause id="sec-ecmascript-language-expressions" number="13">
<h1>ECMAScript Language: Expressions</h1>
<emu-clause id="sec-left-hand-side-expressions" number="3">
<h1>Left-Hand-Side Expressions</h1>
<h2>Syntax</h2>
<emu-grammar type="definition">
ImportCall[Yield, Await] :
`import` `(` AssignmentExpression[+In, ?Yield, ?Await] `)`
`import` `.` `source` `(` AssignmentExpression[+In, ?Yield, ?Await] `)`
</emu-grammar>
<emu-clause id="sec-import-calls" number="10">
<h1>Import Calls</h1>
<emu-clause id="sec-import-call-runtime-semantics-evaluation" type="sdo">
<h1>Runtime Semantics: Evaluation</h1>
<emu-grammar>ImportCall : `import` `(` AssignmentExpression[+In, ?Yield, ?Await] `)`</emu-grammar>
<emu-alg>
1. Return ? EvaluateImportCall(|AssignmentExpression|, ~evaluation~).
</emu-alg>
<emu-grammar>ImportCall : `import` `.` `source` `(` AssignmentExpression[+In, ?Yield, ?Await] `)`</emu-grammar>
<emu-alg>
1. Return ? EvaluateImportCall(|AssignmentExpression|, ~source~).
</emu-alg>
</emu-clause>
<emu-clause id="sec-evaluate-import-call" type="abstract operation">
<h1>
EvaluateImportCall (
_specifierExpression_: a Parse Node,
_phase_: ~source~ or ~evaluation~
): either a normal completion containing a Promise or a throw completion
</h1>
<dl class="header"></dl>
<emu-alg>
1. Let _referrer_ be GetActiveScriptOrModule().
1. If _referrer_ is *null*, set _referrer_ to the current Realm Record.
1. Let _specifierRef_ be ? Evaluation of evaluating _specifierExpression_.
1. Let _specifier_ be ? GetValue(_specifierRef_).
1. Let _promiseCapability_ be ! NewPromiseCapability(%Promise%).
1. <ins>If _specifier_ is an Object, then</ins>
1. <ins>Let _module_ be Completion(HostGetModuleRecordFromSource(_specifier_)).</ins>
1. <ins>IfAbruptRejectPromise(_module_, _promiseCapability_).</ins>
1. <ins>If _module_ is not ~not-a-source~, then</ins>
1. <ins>If _module_.[[Realm]] is not equal to current Realm Record, throw a *TypeError* exception.</ins>
1. <ins>Perform ContinueDynamicImport(_promiseCapability_, _phase_, Completion(_module_)).</ins>
1. <ins>Return _promiseCapability_.[[Promise]].</ins>
1. Let _specifierString_ be Completion(ToString(_specifier_)).
1. IfAbruptRejectPromise(_specifierString_, _promiseCapability_).
1. Let _moduleRequest_ be a new ModuleRequest Record { [[Specifier]]: _specifierString_, [[Phase]]: _phase_ }.
1. Perform HostLoadImportedModule(_referrer_, _moduleRequest_, ~empty~, _promiseCapability_).
1. Return _promiseCapability_.[[Promise]].
</emu-alg>
</emu-clause>
</emu-clause>
<emu-clause id="sec-ContinueDynamicImport" type="abstract operation">
<h1>
ContinueDynamicImport (
_promiseCapability_: a PromiseCapability Record,
<ins>_phase_: ~source~ or ~evaluation~,</ins>
_moduleCompletion_: either a normal completion containing a Module Record or a throw completion,
): ~unused~
</h1>
<dl class="header">
<dt>description</dt>
<dd>It completes the process of a dynamic import originally started by an <emu-xref href="#sec-import-calls">`import()`</emu-xref> call, resolving or rejecting the promise returned by that call as appropriate.</dd>
</dl>
<emu-alg>
1. If _moduleCompletion_ is an abrupt completion, then
1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, « _moduleCompletion_.[[Value]] »).
1. Return ~unused~.
1. Let _module_ be _moduleCompletion_.[[Value]].
1. If _phase_ is ~source~, then
1. Let _moduleSourceCompletion_ be Completion(_module_.GetModuleSource()).
1. If _moduleSourceCompletion_ is an abrupt completion, then
1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, « _moduleSourceCompletion_.[[Value]] »).
1. Else,
1. Perform ! Call(_promiseCapability_.[[Resolve]], *undefined*, « _moduleSourceCompletion_.[[Value]] »).
1. Return ~unused~.
1. Let _loadPromise_ be _module_.LoadRequestedModules().
1. Let _rejectedClosure_ be a new Abstract Closure with parameters (_reason_) that captures _promiseCapability_ and performs the following steps when called:
1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, « _reason_ »).
1. Return ~unused~.
1. Let _onRejected_ be CreateBuiltinFunction(_rejectedClosure_, 1, *""*, « »).
1. Let _linkAndEvaluateClosure_ be a new Abstract Closure with no parameters that captures _module_, _promiseCapability_, and _onRejected_ and performs the following steps when called:
1. Let _link_ be Completion(_module_.Link()).
1. If _link_ is an abrupt completion, then
1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, « _link_.[[Value]] »).
1. Return ~unused~.
1. Let _evaluatePromise_ be _module_.Evaluate().
1. Let _fulfilledClosure_ be a new Abstract Closure with no parameters that captures _module_ and _promiseCapability_ and performs the following steps when called:
1. Let _namespace_ be GetModuleNamespace(_module_).
1. Perform ! Call(_promiseCapability_.[[Resolve]], *undefined*, « _namespace_ »).
1. Return ~unused~.
1. Let _onFulfilled_ be CreateBuiltinFunction(_fulfilledClosure_, *""*, 0, « »).
1. Perform PerformPromiseThen(_evaluatePromise_, _onFulfilled_, _onRejected_).
1. Let _linkAndEvaluate_ be CreateBuiltinFunction(_linkAndEvaluateClosure_, *""*, 0, « »).
1. Perform PerformPromiseThen(_loadPromise_, _linkAndEvaluate_, _onRejected_).
1. Return ~unused~.
</emu-alg>
</emu-clause>
</emu-clause>
</emu-clause>
</emu-clause>
<emu-clause id="sec-ecmascript-language-scripts-and-modules" number="16">
<h1>ECMAScript Language: Scripts and Modules</h1>
<emu-clause id="sec-modules">
<h1>Modules</h1>
<emu-clause id="sec-module-semantics">
<h1>Module Semantics</h1>
<emu-clause id="sec-abstract-module-records">
<h1>Abstract Module Records</h1>
<p>A <dfn variants="Module Records">Module Record</dfn> encapsulates structural information about the imports and exports of a single module. This information is used to link the imports and exports of sets of connected modules. A Module Record includes four fields that are only used when evaluating a module.</p>
<p>For specification purposes Module Record values are values of the Record specification type and can be thought of as existing in a simple object-oriented hierarchy where Module Record is an abstract class with both abstract and concrete subclasses. This specification defines the abstract subclass named Cyclic Module Record and its concrete subclass named Source Text Module Record. Other specifications and implementations may define additional Module Record subclasses corresponding to alternative module definition facilities that they defined.</p>
<p>Module Record defines the fields listed in <emu-xref href="#table-module-record-fields"></emu-xref>. All Module Definition subclasses include at least those fields. Module Record also defines the abstract method list in <emu-xref href="#table-abstract-methods-of-module-records"></emu-xref>. All Module definition subclasses must provide concrete implementations of these abstract methods.</p>
<emu-table id="table-module-record-fields" caption="Module Record Fields" oldids="table-36">
<table>
<thead>
<tr>
<th>
Field Name
</th>
<th>
Value Type
</th>
<th>
Meaning
</th>
</tr>
</thead>
<tr>
<td>
[[Realm]]
</td>
<td>
a Realm Record
</td>
<td>
The Realm within which this module was created.
</td>
</tr>
<tr>
<td>
[[Environment]]
</td>
<td>
a Module Environment Record or ~empty~
</td>
<td>
The Environment Record containing the top level bindings for this module. This field is set when the module is linked.
</td>
</tr>
<tr>
<td>
[[Namespace]]
</td>
<td>
an Object or ~empty~
</td>
<td>
The Module Namespace Object (<emu-xref href="#sec-module-namespace-objects"></emu-xref>) if one has been created for this module.
</td>
</tr>
<tr>
<td>
[[HostDefined]]
</td>
<td>
anything (default value is *undefined*)
</td>
<td>
Field reserved for use by host environments that need to associate additional information with a module.
</td>
</tr>
</table>
</emu-table>
<emu-table id="table-abstract-methods-of-module-records" caption="Abstract Methods of Module Records" oldids="table-37">
<table>
<tr>
<th>
Method
</th>
<th>
Purpose