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/**
* The `vm` module enables compiling and running code within V8 Virtual
* Machine contexts. **The `vm` module is not a security mechanism. Do**
* **not use it to run untrusted code.**
*
* JavaScript code can be compiled and run immediately or
* compiled, saved, and run later.
*
* A common use case is to run the code in a different V8 Context. This means
* invoked code has a different global object than the invoking code.
*
* One can provide the context by `contextifying` an
* object. The invoked code treats any property in the context like a
* global variable. Any changes to global variables caused by the invoked
* code are reflected in the context object.
*
* ```js
* const vm = require('vm');
*
* const x = 1;
*
* const context = { x: 2 };
* vm.createContext(context); // Contextify the object.
*
* const code = 'x += 40; var y = 17;';
* // `x` and `y` are global variables in the context.
* // Initially, x has the value 2 because that is the value of context.x.
* vm.runInContext(code, context);
*
* console.log(context.x); // 42
* console.log(context.y); // 17
*
* console.log(x); // 1; y is not defined.
* ```
* @see [source](https://github.com/nodejs/node/blob/v16.9.0/lib/vm.js)
*/
declare module 'vm' {
interface Context extends NodeJS.Dict<any> {}
interface BaseOptions {
/**
* Specifies the filename used in stack traces produced by this script.
* Default: `''`.
*/
filename?: string | undefined;
/**
* Specifies the line number offset that is displayed in stack traces produced by this script.
* Default: `0`.
*/
lineOffset?: number | undefined;
/**
* Specifies the column number offset that is displayed in stack traces produced by this script.
* @default 0
*/
columnOffset?: number | undefined;
}
interface ScriptOptions extends BaseOptions {
displayErrors?: boolean | undefined;
timeout?: number | undefined;
cachedData?: Buffer | undefined;
/** @deprecated in favor of `script.createCachedData()` */
produceCachedData?: boolean | undefined;
}
interface RunningScriptOptions extends BaseOptions {
/**
* When `true`, if an `Error` occurs while compiling the `code`, the line of code causing the error is attached to the stack trace.
* Default: `true`.
*/
displayErrors?: boolean | undefined;
/**
* Specifies the number of milliseconds to execute code before terminating execution.
* If execution is terminated, an `Error` will be thrown. This value must be a strictly positive integer.
*/
timeout?: number | undefined;
/**
* If `true`, the execution will be terminated when `SIGINT` (Ctrl+C) is received.
* Existing handlers for the event that have been attached via `process.on('SIGINT')` will be disabled during script execution, but will continue to work after that.
* If execution is terminated, an `Error` will be thrown.
* Default: `false`.
*/
breakOnSigint?: boolean | undefined;
/**
* If set to `afterEvaluate`, microtasks will be run immediately after the script has run.
*/
microtaskMode?: 'afterEvaluate' | undefined;
}
interface CompileFunctionOptions extends BaseOptions {
/**
* Provides an optional data with V8's code cache data for the supplied source.
*/
cachedData?: Buffer | undefined;
/**
* Specifies whether to produce new cache data.
* Default: `false`,
*/
produceCachedData?: boolean | undefined;
/**
* The sandbox/context in which the said function should be compiled in.
*/
parsingContext?: Context | undefined;
/**
* An array containing a collection of context extensions (objects wrapping the current scope) to be applied while compiling
*/
contextExtensions?: Object[] | undefined;
}
interface CreateContextOptions {
/**
* Human-readable name of the newly created context.
* @default 'VM Context i' Where i is an ascending numerical index of the created context.
*/
name?: string | undefined;
/**
* Corresponds to the newly created context for display purposes.
* The origin should be formatted like a `URL`, but with only the scheme, host, and port (if necessary),
* like the value of the `url.origin` property of a URL object.
* Most notably, this string should omit the trailing slash, as that denotes a path.
* @default ''
*/
origin?: string | undefined;
codeGeneration?:
| {
/**
* If set to false any calls to eval or function constructors (Function, GeneratorFunction, etc)
* will throw an EvalError.
* @default true
*/
strings?: boolean | undefined;
/**
* If set to false any attempt to compile a WebAssembly module will throw a WebAssembly.CompileError.
* @default true
*/
wasm?: boolean | undefined;
}
| undefined;
/**
* If set to `afterEvaluate`, microtasks will be run immediately after the script has run.
*/
microtaskMode?: 'afterEvaluate' | undefined;
}
type MeasureMemoryMode = 'summary' | 'detailed';
interface MeasureMemoryOptions {
/**
* @default 'summary'
*/
mode?: MeasureMemoryMode | undefined;
context?: Context | undefined;
}
interface MemoryMeasurement {
total: {
jsMemoryEstimate: number;
jsMemoryRange: [number, number];
};
}
/**
* Instances of the `vm.Script` class contain precompiled scripts that can be
* executed in specific contexts.
* @since v0.3.1
*/
class Script {
constructor(code: string, options?: ScriptOptions);
/**
* Runs the compiled code contained by the `vm.Script` object within the given`contextifiedObject` and returns the result. Running code does not have access
* to local scope.
*
* The following example compiles code that increments a global variable, sets
* the value of another global variable, then execute the code multiple times.
* The globals are contained in the `context` object.
*
* ```js
* const vm = require('vm');
*
* const context = {
* animal: 'cat',
* count: 2
* };
*
* const script = new vm.Script('count += 1; name = "kitty";');
*
* vm.createContext(context);
* for (let i = 0; i < 10; ++i) {
* script.runInContext(context);
* }
*
* console.log(context);
* // Prints: { animal: 'cat', count: 12, name: 'kitty' }
* ```
*
* Using the `timeout` or `breakOnSigint` options will result in new event loops
* and corresponding threads being started, which have a non-zero performance
* overhead.
* @since v0.3.1
* @param contextifiedObject A `contextified` object as returned by the `vm.createContext()` method.
* @return the result of the very last statement executed in the script.
*/
runInContext(contextifiedObject: Context, options?: RunningScriptOptions): any;
/**
* First contextifies the given `contextObject`, runs the compiled code contained
* by the `vm.Script` object within the created context, and returns the result.
* Running code does not have access to local scope.
*
* The following example compiles code that sets a global variable, then executes
* the code multiple times in different contexts. The globals are set on and
* contained within each individual `context`.
*
* ```js
* const vm = require('vm');
*
* const script = new vm.Script('globalVar = "set"');
*
* const contexts = [{}, {}, {}];
* contexts.forEach((context) => {
* script.runInNewContext(context);
* });
*
* console.log(contexts);
* // Prints: [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]
* ```
* @since v0.3.1
* @param contextObject An object that will be `contextified`. If `undefined`, a new object will be created.
* @return the result of the very last statement executed in the script.
*/
runInNewContext(contextObject?: Context, options?: RunningScriptOptions): any;
/**
* Runs the compiled code contained by the `vm.Script` within the context of the
* current `global` object. Running code does not have access to local scope, but_does_ have access to the current `global` object.
*
* The following example compiles code that increments a `global` variable then
* executes that code multiple times:
*
* ```js
* const vm = require('vm');
*
* global.globalVar = 0;
*
* const script = new vm.Script('globalVar += 1', { filename: 'myfile.vm' });
*
* for (let i = 0; i < 1000; ++i) {
* script.runInThisContext();
* }
*
* console.log(globalVar);
*
* // 1000
* ```
* @since v0.3.1
* @return the result of the very last statement executed in the script.
*/
runInThisContext(options?: RunningScriptOptions): any;
/**
* Creates a code cache that can be used with the `Script` constructor's`cachedData` option. Returns a `Buffer`. This method may be called at any
* time and any number of times.
*
* ```js
* const script = new vm.Script(`
* function add(a, b) {
* return a + b;
* }
*
* const x = add(1, 2);
* `);
*
* const cacheWithoutX = script.createCachedData();
*
* script.runInThisContext();
*
* const cacheWithX = script.createCachedData();
* ```
* @since v10.6.0
*/
createCachedData(): Buffer;
/** @deprecated in favor of `script.createCachedData()` */
cachedDataProduced?: boolean | undefined;
cachedDataRejected?: boolean | undefined;
cachedData?: Buffer | undefined;
}
/**
* If given a `contextObject`, the `vm.createContext()` method will `prepare
* that object` so that it can be used in calls to {@link runInContext} or `script.runInContext()`. Inside such scripts,
* the `contextObject` will be the global object, retaining all of its existing
* properties but also having the built-in objects and functions any standard [global object](https://es5.github.io/#x15.1) has. Outside of scripts run by the vm module, global variables
* will remain unchanged.
*
* ```js
* const vm = require('vm');
*
* global.globalVar = 3;
*
* const context = { globalVar: 1 };
* vm.createContext(context);
*
* vm.runInContext('globalVar *= 2;', context);
*
* console.log(context);
* // Prints: { globalVar: 2 }
*
* console.log(global.globalVar);
* // Prints: 3
* ```
*
* If `contextObject` is omitted (or passed explicitly as `undefined`), a new,
* empty `contextified` object will be returned.
*
* The `vm.createContext()` method is primarily useful for creating a single
* context that can be used to run multiple scripts. For instance, if emulating a
* web browser, the method can be used to create a single context representing a
* window's global object, then run all `<script>` tags together within that
* context.
*
* The provided `name` and `origin` of the context are made visible through the
* Inspector API.
* @since v0.3.1
* @return contextified object.
*/
function createContext(sandbox?: Context, options?: CreateContextOptions): Context;
/**
* Returns `true` if the given `object` object has been `contextified` using {@link createContext}.
* @since v0.11.7
*/
function isContext(sandbox: Context): boolean;
/**
* The `vm.runInContext()` method compiles `code`, runs it within the context of
* the `contextifiedObject`, then returns the result. Running code does not have
* access to the local scope. The `contextifiedObject` object _must_ have been
* previously `contextified` using the {@link createContext} method.
*
* If `options` is a string, then it specifies the filename.
*
* The following example compiles and executes different scripts using a single `contextified` object:
*
* ```js
* const vm = require('vm');
*
* const contextObject = { globalVar: 1 };
* vm.createContext(contextObject);
*
* for (let i = 0; i < 10; ++i) {
* vm.runInContext('globalVar *= 2;', contextObject);
* }
* console.log(contextObject);
* // Prints: { globalVar: 1024 }
* ```
* @since v0.3.1
* @param code The JavaScript code to compile and run.
* @param contextifiedObject The `contextified` object that will be used as the `global` when the `code` is compiled and run.
* @return the result of the very last statement executed in the script.
*/
function runInContext(code: string, contextifiedObject: Context, options?: RunningScriptOptions | string): any;
/**
* The `vm.runInNewContext()` first contextifies the given `contextObject` (or
* creates a new `contextObject` if passed as `undefined`), compiles the `code`,
* runs it within the created context, then returns the result. Running code
* does not have access to the local scope.
*
* If `options` is a string, then it specifies the filename.
*
* The following example compiles and executes code that increments a global
* variable and sets a new one. These globals are contained in the `contextObject`.
*
* ```js
* const vm = require('vm');
*
* const contextObject = {
* animal: 'cat',
* count: 2
* };
*
* vm.runInNewContext('count += 1; name = "kitty"', contextObject);
* console.log(contextObject);
* // Prints: { animal: 'cat', count: 3, name: 'kitty' }
* ```
* @since v0.3.1
* @param code The JavaScript code to compile and run.
* @param contextObject An object that will be `contextified`. If `undefined`, a new object will be created.
* @return the result of the very last statement executed in the script.
*/
function runInNewContext(code: string, contextObject?: Context, options?: RunningScriptOptions | string): any;
/**
* `vm.runInThisContext()` compiles `code`, runs it within the context of the
* current `global` and returns the result. Running code does not have access to
* local scope, but does have access to the current `global` object.
*
* If `options` is a string, then it specifies the filename.
*
* The following example illustrates using both `vm.runInThisContext()` and
* the JavaScript [`eval()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval) function to run the same code:
*
* ```js
* const vm = require('vm');
* let localVar = 'initial value';
*
* const vmResult = vm.runInThisContext('localVar = "vm";');
* console.log(`vmResult: '${vmResult}', localVar: '${localVar}'`);
* // Prints: vmResult: 'vm', localVar: 'initial value'
*
* const evalResult = eval('localVar = "eval";');
* console.log(`evalResult: '${evalResult}', localVar: '${localVar}'`);
* // Prints: evalResult: 'eval', localVar: 'eval'
* ```
*
* Because `vm.runInThisContext()` does not have access to the local scope,`localVar` is unchanged. In contrast,
* [`eval()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval) _does_ have access to the
* local scope, so the value `localVar` is changed. In this way`vm.runInThisContext()` is much like an [indirect `eval()` call](https://es5.github.io/#x10.4.2), e.g.`(0,eval)('code')`.
*
* ## Example: Running an HTTP server within a VM
*
* When using either `script.runInThisContext()` or {@link runInThisContext}, the code is executed within the current V8 global
* context. The code passed to this VM context will have its own isolated scope.
*
* In order to run a simple web server using the `http` module the code passed to
* the context must either call `require('http')` on its own, or have a reference
* to the `http` module passed to it. For instance:
*
* ```js
* 'use strict';
* const vm = require('vm');
*
* const code = `
* ((require) => {
* const http = require('http');
*
* http.createServer((request, response) => {
* response.writeHead(200, { 'Content-Type': 'text/plain' });
* response.end('Hello World\\n');
* }).listen(8124);
*
* console.log('Server running at http://127.0.0.1:8124/');
* })`;
*
* vm.runInThisContext(code)(require);
* ```
*
* The `require()` in the above case shares the state with the context it is
* passed from. This may introduce risks when untrusted code is executed, e.g.
* altering objects in the context in unwanted ways.
* @since v0.3.1
* @param code The JavaScript code to compile and run.
* @return the result of the very last statement executed in the script.
*/
function runInThisContext(code: string, options?: RunningScriptOptions | string): any;
/**
* Compiles the given code into the provided context (if no context is
* supplied, the current context is used), and returns it wrapped inside a
* function with the given `params`.
* @since v10.10.0
* @param code The body of the function to compile.
* @param params An array of strings containing all parameters for the function.
*/
function compileFunction(code: string, params?: ReadonlyArray<string>, options?: CompileFunctionOptions): Function;
/**
* Measure the memory known to V8 and used by all contexts known to the
* current V8 isolate, or the main context.
*
* The format of the object that the returned Promise may resolve with is
* specific to the V8 engine and may change from one version of V8 to the next.
*
* The returned result is different from the statistics returned by`v8.getHeapSpaceStatistics()` in that `vm.measureMemory()` measure the
* memory reachable by each V8 specific contexts in the current instance of
* the V8 engine, while the result of `v8.getHeapSpaceStatistics()` measure
* the memory occupied by each heap space in the current V8 instance.
*
* ```js
* const vm = require('vm');
* // Measure the memory used by the main context.
* vm.measureMemory({ mode: 'summary' })
* // This is the same as vm.measureMemory()
* .then((result) => {
* // The current format is:
* // {
* // total: {
* // jsMemoryEstimate: 2418479, jsMemoryRange: [ 2418479, 2745799 ]
* // }
* // }
* console.log(result);
* });
*
* const context = vm.createContext({ a: 1 });
* vm.measureMemory({ mode: 'detailed', execution: 'eager' })
* .then((result) => {
* // Reference the context here so that it won't be GC'ed
* // until the measurement is complete.
* console.log(context.a);
* // {
* // total: {
* // jsMemoryEstimate: 2574732,
* // jsMemoryRange: [ 2574732, 2904372 ]
* // },
* // current: {
* // jsMemoryEstimate: 2438996,
* // jsMemoryRange: [ 2438996, 2768636 ]
* // },
* // other: [
* // {
* // jsMemoryEstimate: 135736,
* // jsMemoryRange: [ 135736, 465376 ]
* // }
* // ]
* // }
* console.log(result);
* });
* ```
* @since v13.10.0
* @experimental
*/
function measureMemory(options?: MeasureMemoryOptions): Promise<MemoryMeasurement>;
}
declare module 'node:vm' {
export * from 'vm';
}