@types/node/vm.d.ts

/**
 * 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/v17.0.0/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';
}