path: root/js/xpconnect/idl/xpccomponents.idl

/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

%{C++
#include "jspubtd.h"
%}

interface xpcIJSWeakReference;
interface nsIClassInfo;
interface nsICommandParams;
interface nsIComponentManager;
interface nsICycleCollectorListener;
interface nsIDocumentEncoder;
interface nsIEditorSpellCheck;
interface nsIFile;
interface nsILoadContext;
interface nsIPersistentProperties;
interface nsIURI;
interface nsIPrincipal;
interface nsIStackFrame;
webidl Element;

/**
* interface of Components.interfaces
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(b8c31bba-79db-4a1d-930d-4cdd68713f9e)]
interface nsIXPCComponents_Interfaces : nsISupports
{
};

/**
* interface of Components.classes
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(978ff520-d26c-11d2-9842-006008962422)]
interface nsIXPCComponents_Classes : nsISupports
{
};

/**
* interface of Components.results
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(2fc229a0-5860-11d3-9899-006008962422)]
interface nsIXPCComponents_Results : nsISupports
{
};

/**
* interface of Components.ID
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(7994a6e0-e028-11d3-8f5d-0010a4e73d9a)]
interface nsIXPCComponents_ID : nsISupports
{
};

/**
* interface of Components.Exception
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(5bf039c0-e028-11d3-8f5d-0010a4e73d9a)]
interface nsIXPCComponents_Exception : nsISupports
{
};

/**
* interface of Components.Constructor
* (interesting stuff only reflected into JavaScript)
*/
[scriptable, builtinclass, uuid(88655640-e028-11d3-8f5d-0010a4e73d9a)]
interface nsIXPCComponents_Constructor : nsISupports
{
};

/**
* interface of object returned by Components.utils.Sandbox.
*/
[scriptable, builtinclass, uuid(4f8ae0dc-d266-4a32-875b-6a9de71a8ce9)]
interface nsIXPCComponents_utils_Sandbox : nsISupports
{
};

/**
 * interface for callback to be passed to Cu.schedulePreciseGC
 */
[scriptable, function, uuid(71000535-b0fd-44d1-8ce0-909760e3953c)]
interface nsIScheduledGCCallback : nsISupports
{
    void callback();
};

/**
* interface of Components.utils
*/
[scriptable, builtinclass, uuid(86003fe3-ee9a-4620-91dc-eef8b1e58815)]
interface nsIXPCComponents_Utils : nsISupports
{
    /*
     * Prints the provided message to stderr.
     */
    void printStderr(in AUTF8String message);

    /*
     * reportError is designed to be called from JavaScript only.
     *
     * It will report a JS Error object to the JS console, and return. It
     * is meant for use in exception handler blocks which want to "eat"
     * an exception, but still want to report it to the console.
     *
     * It must be called with one param, usually an object which was caught by
     * an exception handler.  If it is not a JS error object, the parameter
     * is converted to a string and reported as a new error.
     *
     * If called with two parameters, and the first parameter is not an
     * object, the second parameter is used as the stack for the error report.
     */
    [implicit_jscontext]
    void reportError(in jsval error, [optional] in jsval stack);


    /**
     * Cu.Sandbox is used to create a sandbox object
     *
     *     let sandbox = Cu.Sandbox(principal[, options]);
     *
     * Using new Cu.Sandbox(...) to create a sandbox has the same effect as
     * calling Cu.Sandbox(...) without new.
     *
     * In JS, Cu.Sandbox uses the following parameters:
     *
     * @param {Principal} principal
     *        The security principal defined for a sandbox determines what code
     *        running in that sandbox will be allowed to do. The principal may be one
     *        of four types: the system principal, a content principal, an expanded
     *        principal or a null principal. Depending on the principal type,
     *        this argument can be a nsIPrincipal, a Window, a String, an Array
     *        or null. See below.
     *          A content principal can be provided by passing a nsIPrincipal, a
     *        DOM Window, or a string URI (not recommended).
     *          An expanded (or extended) principal is an array of principals,
     *        where each item can be either a nsIPrincipal, a DOM window or a
     *        string URI.
     *          A null principal can either be specified by passing `null` or
     *        created explicitly with `Cc["@mozilla.org/nullprincipal;1"].createInstance(Ci.nsIPrincipal);`
     * @param {Object} options
     *        Optional parameters, valid properties are:
     *        - allowWaivers: {Boolean} Allows the caller to waive Xrays, in case
     *          Xrays were used. Defaults to true.
     *        - discardSource: {Boolean} For certain globals, we know enough about
     *          the code that will run in them that we can discard script source
     *          entirely. A discarded source will be re-read when stringifying
     *          functions.
     *            Defaults to false.
     *        - forceSecureContext: {Boolean} Determines whether content windows and
     *          workers are marked as "Secure Context"s. If principal is the system
     *          principal, the value is forced to true. Otherwise defaults to false.
     *        - freshCompartment: {Boolean} Whether the sandbox should be created
     *          using a new compartment. Defaults to false.
     *        - freshZone: {Boolean} if true creates a new GC region separate from
     *          both the calling context's and the sandbox prototype's region.
     *            Defaults to false.
     *        - invisibleToDebugger: {Boolean} Whether this sandbox and its scripts
     *          can be accessed by the JavaScript Debugger.
     *            Defaults to false.
     *        - isWebExtensionContentScript: {Boolean} Whether this sandbox
     *          corresponds to a WebExtension content script, and should receive
     *          various bits of special compatibility behavior.
     *            Defaults to false.
     *        - metadata: {Object} Object to use as the metadata for the sandbox. See
     *          setSandboxMetadata.
     *        - originAttributes: {Object} Dictionary of origin attributes to use if
     *          the principal was provided as a string.
     *        - sameZoneAs: {Object} Javascript Object in whose garbage collection
     *          region the sandbox should be created. This helps to improve memory
     *          usage by allowing sandboxes to be discarded when that zone goes away.
     *          It also improves performance and memory usage by allowing strings
     *          to be passed between the compartments without copying or using
     *          wrappers.
     *            Content scripts should pass the window they're running in as this
     *          parameter, in order to ensure that the script is cleaned up at the
     *          same time as the content itself.
     *        - sandboxName: {String} Identifies the sandbox in about:memory. This
     *          property is optional, but very useful for tracking memory usage. A
     *          recommended value for this property is an absolute path to the script
     *          responsible for creating the sandbox. If you don't specify a sandbox
     *          name it will default to the caller's filename.
     *        - sandboxPrototype: {Object} Prototype object for the sandbox. The
     *          sandbox will inherit the contents of this object if it's provided.
     *          Passing a content window object, setting wantXrays:true (default) and
     *          using an extended principal provides a clean, isolated execution
     *          environment in which javascript code that needs Web APIs (such as
     *          accessing the window's DOM) can be executed without interference from
     *          untrusted content code.
     *        - userContextId: {Number} The id of the user context this sandbox is
     *          inside. Defaults to 0.
     *        - wantComponents: {Boolean} Indicates whether the Components object is
     *          available or not in the sandbox. If the sandbox interacts with
     *          untrusted content this should be set to false when possible to
     *          further reduce possible attack surface.
     *            Defaults to true.
     *        - wantExportHelpers: {Boolean} if true, then createObjectIn(),
     *          evalInWindow(), and exportFunction() are available in the sandbox.
     *            Defaults to false.
     *        - wantGlobalProperties: {Array<String>} Each string is the name of an
     *          object that you want to make available as a global to code running in
     *          the sandbox. Possible values: Blob, ChromeUtils, CSS, CSSRule,
     *          Directory, DOMParser, Element, Event, File, FileReader, FormData,
     *          InspectorUtils, MessageChannel, Node, NodeFilter, PromiseDebugging,
     *          TextDecoder, TextEncoder, URL, URLSearchParams, XMLHttpRequest,
     *          XMLSerializer, atob, btoa, caches, crypto, fetch, indexedDB,
     *          rtcIdentityProvider
     *        - wantXrays: {Boolean} Whether the sandbox wants Xray vision with
     *          respect to same-origin objects outside the sandbox.
     *            Note that wantXrays is essentially deprecated. The preferred method
     *          of handling this now is to give the sandbox an expanded principal
     *          which inherits from the principal of the content compartment the
     *          sandbox will interact with. That lets the sandbox see the content
     *          compartment through X-ray wrappers, and gives any object passed from
     *          the sandbox to the content compartment opaque security wrappers unless
     *          export helpers are explicitly used.
     *            "Xray vision" is exactly the same Xray behavior that script always
     *          gets, by default, when working with DOM objects across origin
     *          boundaries. This is primarily visible for chrome code accessing
     *          content. However, it also occurs during cross-origin access between
     *          two content pages, since each page sees a "vanilla" view of the
     *          other. The protection is bidirectional: the caller sees the bonafide
     *          DOM objects without being confused by sneakily-redefined properties,
     *          and the target receives appropriate privacy from having its expandos
     *          inspected by untrusted callers. In situations where only
     *          unidirectional protection is needed, callers have the option to waive
     *          the X-ray behavior using wrappedJSObject or XPCNativeWrapper.unwrap().
     *            In general, when accessing same-origin content, script gets a
     *          Transparent wrapper rather than an Xray wrapper. However, sandboxes
     *          are often used when chrome wants to run script as another origin,
     *          possibly to interact with the page. In this case, same-origin Xrays
     *          are desirable, and wantXrays should be set to true.
     *            Defaults to true.
     */
    readonly attribute nsIXPCComponents_utils_Sandbox Sandbox;

    /*
     * evalInSandbox is designed to be called from JavaScript only.
     *
     * evalInSandbox evaluates the provided source string in the given sandbox.
     * It returns the result of the evaluation to the caller.
     *
     * var s = new C.u.Sandbox("http://www.mozilla.org");
     * var res = C.u.evalInSandbox("var five = 5; 2 + five", s);
     * var outerFive = s.five;
     * s.seven = res;
     * var thirtyFive = C.u.evalInSandbox("five * seven", s);
     */
    [implicit_jscontext,optional_argc]
    jsval evalInSandbox(in AString source, in jsval sandbox,
                        [optional] in jsval version,
                        [optional] in AUTF8String filename,
                        [optional] in long lineNo,
                        [optional] in bool enforceFilenameRestrictions);

    /*
     * Get the sandbox for running JS-implemented UA widgets (video controls etc.),
     * hosted inside UA-created Shadow DOM.
     */
    [implicit_jscontext]
    jsval getUAWidgetScope(in nsIPrincipal principal);

    /*
     * getSandboxMetadata is designed to be called from JavaScript only.
     *
     * getSandboxMetadata retrieves the metadata associated with
     * a sandbox object. It will return undefined if there
     * is no metadata attached to the sandbox.
     *
     * var s = C.u.Sandbox(..., { metadata: "metadata" });
     * var metadata = C.u.getSandboxMetadata(s);
     */
    [implicit_jscontext]
    jsval getSandboxMetadata(in jsval sandbox);

    /*
     * setSandboxMetadata is designed to be called from JavaScript only.
     *
     * setSandboxMetadata sets the metadata associated with
     * a sandbox object.
     *
     * Note that the metadata object will be copied before being used.
     * The copy will be performed using the structured clone algorithm.
     * Note that this algorithm does not support reflectors and
     * it will throw if it encounters them.
     */
    [implicit_jscontext]
    void setSandboxMetadata(in jsval sandbox, in jsval metadata);

    /*
     * import is designed to be called from JavaScript only.
     *
     * Synchronously loads and evaluates the js file located at
     * 'registryLocation' with a new, fully privileged global object.
     *
     * If 'targetObj' is specified and equal to null, returns the
     * module's global object. Otherwise (if 'targetObj' is not
     * specified, or 'targetObj' is != null) looks for a property
     * 'EXPORTED_SYMBOLS' on the new global object. 'EXPORTED_SYMBOLS'
     * is expected to be an array of strings identifying properties on
     * the global object.  These properties will be installed as
     * properties on 'targetObj', or, if 'targetObj' is not specified,
     * on the caller's global object. If 'EXPORTED_SYMBOLS' is not
     * found, an error is thrown.
     *
     * @param resourceURI A resource:// URI string to load the module from.
     * @param targetObj  the object to install the exported properties on.
     *        If this parameter is a primitive value, this method throws
     *        an exception.
     * @returns the module code's global object.
     *
     * The implementation maintains a hash of registryLocation->global obj.
     * Subsequent invocations of importModule with 'registryLocation'
     * pointing to the same file will not cause the module to be re-evaluated,
     * but the symbols in EXPORTED_SYMBOLS will be exported into the
     * specified target object and the global object returned as above.
     *
     * TODO: Remove this once m-c, c-c, and out-of-tree code migrations finish
     *       (bug 1776175, bug 1881888).
     */
    [implicit_jscontext,optional_argc]
    jsval import(in AUTF8String aResourceURI, [optional] in jsval targetObj);

    /**
     * Returns true if the JSM is loaded into the system global previously via
     * the import method above, or corresponding ESM is loaded. Returns false
     * otherwise.
     *
     * @param resourceURI A resource:// URI string representing the location of
     *        the js file to be checked if it is already loaded or not.
     * @returns boolean, true if the js file has been loaded via import. false
     *          otherwise
     */
    boolean isModuleLoaded(in AUTF8String aResourceURI);


    /**
     * Returns true if the JSM is loaded into the system global previously via
     * the import method above. Returns false otherwise.
     *
     * TODO: Remove this once m-c, c-c, and out-of-tree code migrations finish
     *       (bug 1776175, bug 1881888).
     */
    boolean isJSModuleLoaded(in AUTF8String aResourceURI);

    /**
     * Returns true if the ESM is loaded into the system global previously via
     * the ChromeUtils.importESModule method etc. Returns false otherwise.
     */
    boolean isESModuleLoaded(in AUTF8String aResourceURI);

    /*
     * Unloads the JS module at 'registryLocation'. Existing references to the
     * module will continue to work but any subsequent import of the module will
     * reload it and give new reference. If the JS module hasn't yet been
     * imported then this method will do nothing.
     *
     * @param resourceURI A resource:// URI string to unload the module from.
     *
     * TODO: Remove this once m-c, c-c, and out-of-tree code migrations finish
     *       (bug 1776175, bug 1881888).
     */
    void unload(in AUTF8String registryLocation);

    /*
     * Imports global properties (like DOM constructors) into the scope, defining
     * them on the caller's global. aPropertyList should be an array of property
     * names.
     *
     * See xpc::GlobalProperties::Parse for the current list of supported
     * properties.
     */
    [implicit_jscontext]
    void importGlobalProperties(in jsval aPropertyList);

    /*
     * To be called from JS only.
     *
     * Return a weak reference for the given JS object.
     */
    [implicit_jscontext]
    xpcIJSWeakReference getWeakReference(in jsval obj);

    /*
     * To be called from JS only.
     *
     * Force an immediate garbage collection cycle.
     */
    [implicit_jscontext]
    void forceGC();

    /*
     * To be called from JS only.
     *
     * Force an immediate cycle collection cycle.
     */
    void forceCC([optional] in nsICycleCollectorListener aListener);

    /*
     * To be called from JS only.  C++ callers should use the
     * nsCycleCollector_createLogger() function instead.
     *
     * Create an instance of the built-in cycle collector logger object.
     */
    nsICycleCollectorListener createCCLogger();

    /*
     * To be called from JS only.
     *
     * If any incremental CC is in progress, finish it. For testing.
     */
    void finishCC();

    /*
     * To be called from JS only.
     *
     * Do some cycle collector work, with the given work budget.
     * The cost of calling Traverse() on a single object is set as 1.
     * For testing.
     */
    void ccSlice(in long long budget);

    /*
     * To be called from JS only.
     *
     * Return the longest cycle collector slice time since the last
     * time clearMaxCCTime() was called.
     */
    long getMaxCCSliceTimeSinceClear();

    /*
     * To be called from JS only.
     *
     * Reset the internal max slice time value used for
     * getMaxCCSliceTimeSinceClear().
     */
    void clearMaxCCTime();

    /*
     * To be called from JS only.
     *
     * Force an immediate shrinking garbage collection cycle.
     */
    [implicit_jscontext]
    void forceShrinkingGC();

    /*
     * Schedule a garbage collection cycle for a point in the future when no JS
     * is running. Call the provided function once this has occurred.
     */
    void schedulePreciseGC(in nsIScheduledGCCallback callback);

    /*
     * Schedule a shrinking garbage collection cycle for a point in the future
     * when no JS is running. Call the provided function once this has occured.
     */
    void schedulePreciseShrinkingGC(in nsIScheduledGCCallback callback);

    /*
     * In a debug build, unlink any ghost windows. This is only for debugging
     * leaks, and can cause bad things to happen if called.
     */
    void unlinkGhostWindows();

    /*
     * In an NS_FREE_PERMANENT_DATA build, intentionally leak a C++ object. This
     * is needed to test leak checking.
     */
    void intentionallyLeak();

    [implicit_jscontext]
    jsval getJSTestingFunctions();

    /**
     * Returns an object containing `filename` and `lineNumber` properties
     * describing the source location of the given function.
     */
    [implicit_jscontext]
    jsval getFunctionSourceLocation(in jsval func);

    /*
     * To be called from JS only.
     *
     * Call 'func', using the provided stack as the async stack responsible
     * for the call, and propagate its return value or the exception it throws.
     * The function is called with no arguments, and 'this' is 'undefined'.
     *
     * The code in the function will see the given stack frame as the
     * asyncCaller of its own stack frame, instead of the current caller.
     */
    [implicit_jscontext]
    jsval callFunctionWithAsyncStack(in jsval func, in nsIStackFrame stack,
                                     in AString asyncCause);

    /*
     * To be called from JS only.
     *
     * Returns the global object with which the given object is associated.
     *
     * @param obj The JavaScript object whose global is to be gotten.
     * @return the corresponding global.
     */
    [implicit_jscontext]
    jsval getGlobalForObject(in jsval obj);

    /*
     * To be called from JS only.
     *
     * Returns the true if the object is a (scripted) proxy.
     * NOTE: Security wrappers are unwrapped first before the check.
     */
    [implicit_jscontext]
    boolean isProxy(in jsval vobject);

    /*
     * To be called from JS only.
     *
     * Instead of simply wrapping a function into another compartment,
     * this helper function creates a native function in the target
     * compartment and forwards the call to the original function.
     * That call will be different than a regular JS function call in
     * that, the |this| is left unbound, and all the non-native JS
     * object arguments will be cloned using the structured clone
     * algorithm.
     * The return value is the new forwarder function, wrapped into
     * the caller's compartment.
     * The 3rd argument is an optional options object:
     * - defineAs: the name of the property that will
     *             be set on the target scope, with
     *             the forwarder function as the value.
     */
    [implicit_jscontext]
    jsval exportFunction(in jsval vfunction, in jsval vscope, [optional] in jsval voptions);

    /*
     * To be called from JS only.
     *
     * Returns an object created in |vobj|'s compartment.
     * If defineAs property on the options object is a non-null ID,
     * the new object will be added to vobj as a property. Also, the
     * returned new object is always automatically waived (see waiveXrays).
     */
    [implicit_jscontext]
    jsval createObjectIn(in jsval vobj, [optional] in jsval voptions);

    /*
     * To be called from JS only.
     *
     * Ensures that all functions come from vobj's scope (and aren't cross
     * compartment wrappers).
     */
    [implicit_jscontext]
    void makeObjectPropsNormal(in jsval vobj);

    /**
     * Determines whether this object is backed by a DeadObjectProxy.
     *
     * Dead-wrapper objects hold no other objects alive (they have no outgoing
     * reference edges) and will throw if you touch them (e.g. by
     * reading/writing a property).
     */
    bool isDeadWrapper(in jsval obj);

    /**
     * Determines whether this value is a remote object proxy, such as
     * RemoteWindowProxy or RemoteLocationProxy, for an out-of-process frame.
     *
     * Remote object proxies do not grant chrome callers the same exemptions
     * to the same-origin-policy that in-process wrappers typically do, so
     * this can be used to determine whether access to cross-origin proxies is
     * safe:
     *
     *   if (!Cu.isRemoteProxy(frame.contentWindow)) {
     *     frame.contentWindow.doCrossOriginThing();
     *   }
     */
    bool isRemoteProxy(in jsval val);

    /*
     * To be called from JS only. This is for Gecko internal use only, and may
     * disappear at any moment.
     *
     * Forces a recomputation of all wrappers in and out of the compartment
     * containing |vobj|. If |vobj| is not an object, all wrappers system-wide
     * are recomputed.
     */
    [implicit_jscontext]
    void recomputeWrappers([optional] in jsval vobj);

    /*
     * To be called from JS only. This is for Gecko internal use only, and may
     * disappear at any moment.
     *
     * Enables Xray vision for same-compartment access for the compartment
     * indicated by |vscope|. All outgoing wrappers are recomputed.
     *
     * This must not be called on chrome (system-principal) scopes.
     */
    [implicit_jscontext]
    void setWantXrays(in jsval vscope);

    /*
     * Dispatches a runnable to the current/main thread. If |scope| is passed,
     * the runnable will be dispatch in the compartment of |scope|, which
     * affects which error reporter gets called.
     */
    [implicit_jscontext]
    void dispatch(in jsval runnable, [optional] in jsval scope);

    // Returns true if we're running in automation and certain security
    // restrictions can be eased.
    readonly attribute boolean isInAutomation;

    // Called by automated tests to exit immediately after we are done getting
    // test results.
    void exitIfInAutomation();

    void crashIfNotInAutomation();

    [implicit_jscontext]
    void setGCZeal(in long zeal);

    [implicit_jscontext]
    void nukeSandbox(in jsval obj);

    /*
     * API to dynamically block script for a given global. This takes effect
     * immediately, unlike other APIs that only affect newly-created globals.
     *
     * The machinery here maintains a counter, and allows script only if each
     * call to blockScriptForGlobal() has been matched with a call to
     * unblockScriptForGlobal(). The caller _must_ make sure never to call
     * unblock() more times than it calls block(), since that could potentially
     * interfere with another consumer's script blocking.
     */

    [implicit_jscontext]
    void blockScriptForGlobal(in jsval global);

    [implicit_jscontext]
    void unblockScriptForGlobal(in jsval global);

    /**
     * Check whether the given object is an opaque wrapper (PermissiveXrayOpaque).
     */
    bool isOpaqueWrapper(in jsval obj);

    /**
     * Check whether the given object is an XrayWrapper.
     */
    bool isXrayWrapper(in jsval obj);

    /**
     * Waive Xray on a given value. Identity op for primitives.
     */
    [implicit_jscontext]
    jsval waiveXrays(in jsval aVal);

    /**
     * Strip off Xray waivers on a given value. Identity op for primitives.
     */
    [implicit_jscontext]
    jsval unwaiveXrays(in jsval aVal);

    /**
     * Gets the name of the JSClass of the object.
     *
     * if |aUnwrap| is true, all wrappers are unwrapped first. Unless you're
     * specifically trying to detect whether the object is a proxy, this is
     * probably what you want.
     */
    [implicit_jscontext]
    string getClassName(in jsval aObj, in bool aUnwrap);

    /**
     * Get a DOM classinfo for the given classname.  Only some class
     * names are supported.
     */
    nsIClassInfo getDOMClassInfo(in AString aClassName);

    /**
     * Gets the incument global for the execution of this function. For internal
     * and testing use only.
     *
     * If |callback| is passed, it is invoked with the incumbent global as its
     * sole argument. This allows the incumbent global to be measured in callback
     * environments with no scripted frames on the stack.
     */
    [implicit_jscontext]
    jsval getIncumbentGlobal([optional] in jsval callback);

    /**
     * Returns a name for the given function or object which is useful for
     * debugging. It will be very similar to the name displayed in call
     * stacks.

     * Objects which contain a single enumerable property which is a function
     * will generate a name based on that function. Any other non-function
     * objects will return "nonfunction".
     */
    [implicit_jscontext]
    ACString getDebugName(in jsval obj);

    /**
      * Retrieve the last time, in microseconds since epoch, that a given
      * watchdog-related event occured.
      *
      * Valid categories:
      *   "ContextStateChange"      - Context switching between active and inactive states
      *   "WatchdogWakeup"          - Watchdog waking up from sleeping
      *   "WatchdogHibernateStart"  - Watchdog begins hibernating
      *   "WatchdogHibernateStop"   - Watchdog stops hibernating
      */
    PRTime getWatchdogTimestamp(in AString aCategory);

    [implicit_jscontext]
    jsval getJSEngineTelemetryValue();

    /*
     * Clone an object into a scope.
     * The 3rd argument is an optional options object:
     * - cloneFunctions: boolean. If true, functions in the value are
     *   wrapped in a function forwarder that appears to be a native function in
     *   the content scope. Defaults to false.
     * - wrapReflectors: boolean. If true, DOM objects are passed through the
     *   clone directly with cross-compartment wrappers. Otherwise, the clone
     *   fails when such an object is encountered. Defaults to false.
     */
    [implicit_jscontext]
    jsval cloneInto(in jsval value, in jsval scope, [optional] in jsval options);

    /*
     * When C++-Implemented code does security checks, it can generally query
     * the subject principal (i.e. the principal of the most-recently-executed
     * script) in order to determine the responsible party. However, when an API
     * is implemented in JS, this doesn't work - the most-recently-executed
     * script is always the System-Principaled API implementation. So we need
     * another mechanism.
     *
     * Hence the notion of the "WebIDL Caller". If the current Entry Script on
     * the Script Settings Stack represents the invocation of JS-implemented
     * WebIDL, this API returns the principal of the caller at the time
     * of invocation. Otherwise (i.e. outside of JS-implemented WebIDL), this
     * function throws. If it throws, you probably shouldn't be using it.
     */
    nsIPrincipal getWebIDLCallerPrincipal();

    /*
     * Gets the principal of a script object, after unwrapping any cross-
     * compartment wrappers.
     */
    [implicit_jscontext]
    nsIPrincipal getObjectPrincipal(in jsval obj);

    /*
     * Gets the URI or identifier string associated with an object's
     * realm (the same one used by the memory reporter machinery).
     *
     * Unwraps cross-compartment wrappers first.
     *
     * The string formats and values may change at any time. Do not depend on
     * this from addon code.
     */
    [implicit_jscontext]
    ACString getRealmLocation(in jsval obj);

    /*
     * Return a fractional number of milliseconds from process
     * startup, measured with a monotonic clock.
     */
    double now();

    /*
     * Reads the given file and returns its contents. If called during early
     * startup, the file will be pre-read on a background thread during profile
     * startup so its contents will be available the next time they're read.
     *
     * The file must be a text file encoded in UTF-8. Otherwise the result is
     * undefined.
     */
    AUTF8String readUTF8File(in nsIFile file);

    /*
     * Reads the given local file URL and returns its contents. This has the
     * same semantics of readUTF8File.
     * Only supports file URLs or URLs that point into one of the omnijars.
     */
    AUTF8String readUTF8URI(in nsIURI url);

    /* Create a spellchecker object. */
    nsIEditorSpellCheck createSpellChecker();

    /* Create a commandline object.
     *
     * @return a new `nsICommandLine` instance.
     *
     * @param args
     *   The arguments of the command line, not including the app/program itself.
     * @param workingDir
     *   An optional working directory for the command line.
     * @param state
     *   The command line's state, one of `nsICommandLine.STATE_INITIAL_LAUNCH`,
     *   `nsICommandLine.STATE_REMOTE_AUTO`, or
     *   `nsICommandLine.STATE_REMOTE_EXPLICIT`.
     */
    nsISupports createCommandLine(in Array<ACString> args,
                                  in nsIFile workingDir,
                                  in unsigned long state);

    /* Create a command params object. */
    nsICommandParams createCommandParams();

    /* Create a loadcontext object. */
    nsILoadContext createLoadContext();

    /* Create a private loadcontext object. */
    nsILoadContext createPrivateLoadContext();

    /* Create a persistent property object. */
    nsIPersistentProperties createPersistentProperties();

    /* Create a document encoder object. */
    nsIDocumentEncoder createDocumentEncoder(in string contentType);

    /* Create an HTML copy encoder object. */
    nsIDocumentEncoder createHTMLCopyEncoder();

    // These attributes are for startup testing purposes. They are not expected
    // to be used for production code.

    // Array of the URI of JSM and ESM loaded, converting ESM URI into JSM URI.
    readonly attribute Array<ACString> loadedModules;

    // Array of the URI of JSM loaded.
    readonly attribute Array<ACString> loadedJSModules;

    // Array of the URI of ESM loaded.
    readonly attribute Array<ACString> loadedESModules;


    // This function will only return useful values if the
    // "browser.startup.record" preference was true at the time the JS file
    // was loaded.
    ACString getModuleImportStack(in AUTF8String aLocation);
};

/**
* Interface for the 'Components' object.
*/

[scriptable, builtinclass, uuid(aa28aaf6-70ce-4b03-9514-afe43c7dfda8)]
interface nsIXPCComponents : nsISupports
{
    readonly attribute nsIXPCComponents_Interfaces      interfaces;
    readonly attribute nsIXPCComponents_Results         results;

    boolean isSuccessCode(in nsresult result);

    readonly attribute nsIXPCComponents_Classes         classes;
    // Will return null if there is no JS stack right now.
    readonly attribute nsIStackFrame                    stack;
    readonly attribute nsIComponentManager              manager;
    readonly attribute nsIXPCComponents_Utils           utils;

    readonly attribute nsIXPCComponents_ID              ID;
    readonly attribute nsIXPCComponents_Exception       Exception;
    readonly attribute nsIXPCComponents_Constructor     Constructor;

    [implicit_jscontext]
    // A javascript component can set |returnCode| to specify an nsresult to
    // be returned without throwing an exception.
    attribute jsval                                     returnCode;
};