904 lines
38 KiB
Plaintext
904 lines
38 KiB
Plaintext
/**
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* The `node:vm` module enables compiling and running code within V8 Virtual
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* Machine contexts.
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*
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* **The `node:vm` module is not a security**
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* **mechanism. Do not use it to run untrusted code.**
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*
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* JavaScript code can be compiled and run immediately or
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* compiled, saved, and run later.
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*
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* A common use case is to run the code in a different V8 Context. This means
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* invoked code has a different global object than the invoking code.
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*
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* One can provide the context by `contextifying` an
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* object. The invoked code treats any property in the context like a
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* global variable. Any changes to global variables caused by the invoked
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* code are reflected in the context object.
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*
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* ```js
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* const vm = require('node:vm');
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*
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* const x = 1;
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*
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* const context = { x: 2 };
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* vm.createContext(context); // Contextify the object.
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*
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* const code = 'x += 40; var y = 17;';
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* // `x` and `y` are global variables in the context.
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* // Initially, x has the value 2 because that is the value of context.x.
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* vm.runInContext(code, context);
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*
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* console.log(context.x); // 42
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* console.log(context.y); // 17
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*
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* console.log(x); // 1; y is not defined.
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* ```
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* @see [source](https://github.com/nodejs/node/blob/v20.2.0/lib/vm.js)
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*/
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declare module "vm" {
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import { ImportAttributes } from "node:module";
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interface Context extends NodeJS.Dict<any> {}
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interface BaseOptions {
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/**
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* Specifies the filename used in stack traces produced by this script.
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* Default: `''`.
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*/
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filename?: string | undefined;
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/**
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* Specifies the line number offset that is displayed in stack traces produced by this script.
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* Default: `0`.
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*/
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lineOffset?: number | undefined;
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/**
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* Specifies the column number offset that is displayed in stack traces produced by this script.
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* @default 0
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*/
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columnOffset?: number | undefined;
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}
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interface ScriptOptions extends BaseOptions {
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/**
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* V8's code cache data for the supplied source.
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*/
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cachedData?: Buffer | NodeJS.ArrayBufferView | undefined;
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/** @deprecated in favor of `script.createCachedData()` */
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produceCachedData?: boolean | undefined;
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/**
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* Called during evaluation of this module when `import()` is called.
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* If this option is not specified, calls to `import()` will reject with `ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING`.
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*/
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importModuleDynamically?:
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| ((specifier: string, script: Script, importAttributes: ImportAttributes) => Module)
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| undefined;
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}
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interface RunningScriptOptions extends BaseOptions {
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/**
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* When `true`, if an `Error` occurs while compiling the `code`, the line of code causing the error is attached to the stack trace.
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* Default: `true`.
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*/
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displayErrors?: boolean | undefined;
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/**
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* Specifies the number of milliseconds to execute code before terminating execution.
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* If execution is terminated, an `Error` will be thrown. This value must be a strictly positive integer.
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*/
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timeout?: number | undefined;
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/**
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* If `true`, the execution will be terminated when `SIGINT` (Ctrl+C) is received.
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* 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.
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* If execution is terminated, an `Error` will be thrown.
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* Default: `false`.
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*/
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breakOnSigint?: boolean | undefined;
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}
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interface RunningScriptInNewContextOptions extends RunningScriptOptions {
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/**
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* Human-readable name of the newly created context.
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*/
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contextName?: CreateContextOptions["name"];
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/**
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* Origin corresponding to the newly created context for display purposes. The origin should be formatted like a URL,
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* but with only the scheme, host, and port (if necessary), like the value of the `url.origin` property of a `URL` object.
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* Most notably, this string should omit the trailing slash, as that denotes a path.
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*/
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contextOrigin?: CreateContextOptions["origin"];
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contextCodeGeneration?: CreateContextOptions["codeGeneration"];
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/**
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* If set to `afterEvaluate`, microtasks will be run immediately after the script has run.
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*/
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microtaskMode?: CreateContextOptions["microtaskMode"];
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}
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interface RunningCodeOptions extends RunningScriptOptions {
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cachedData?: ScriptOptions["cachedData"];
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importModuleDynamically?: ScriptOptions["importModuleDynamically"];
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}
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interface RunningCodeInNewContextOptions extends RunningScriptInNewContextOptions {
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cachedData?: ScriptOptions["cachedData"];
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importModuleDynamically?: ScriptOptions["importModuleDynamically"];
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}
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interface CompileFunctionOptions extends BaseOptions {
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/**
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* Provides an optional data with V8's code cache data for the supplied source.
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*/
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cachedData?: Buffer | undefined;
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/**
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* Specifies whether to produce new cache data.
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* Default: `false`,
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*/
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produceCachedData?: boolean | undefined;
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/**
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* The sandbox/context in which the said function should be compiled in.
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*/
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parsingContext?: Context | undefined;
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/**
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* An array containing a collection of context extensions (objects wrapping the current scope) to be applied while compiling
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*/
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contextExtensions?: Object[] | undefined;
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}
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interface CreateContextOptions {
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/**
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* Human-readable name of the newly created context.
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* @default 'VM Context i' Where i is an ascending numerical index of the created context.
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*/
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name?: string | undefined;
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/**
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* Corresponds to the newly created context for display purposes.
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* The origin should be formatted like a `URL`, but with only the scheme, host, and port (if necessary),
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* like the value of the `url.origin` property of a URL object.
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* Most notably, this string should omit the trailing slash, as that denotes a path.
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* @default ''
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*/
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origin?: string | undefined;
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codeGeneration?:
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| {
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/**
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* If set to false any calls to eval or function constructors (Function, GeneratorFunction, etc)
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* will throw an EvalError.
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* @default true
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*/
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strings?: boolean | undefined;
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/**
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* If set to false any attempt to compile a WebAssembly module will throw a WebAssembly.CompileError.
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* @default true
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*/
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wasm?: boolean | undefined;
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}
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| undefined;
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/**
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* If set to `afterEvaluate`, microtasks will be run immediately after the script has run.
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*/
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microtaskMode?: "afterEvaluate" | undefined;
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}
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type MeasureMemoryMode = "summary" | "detailed";
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interface MeasureMemoryOptions {
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/**
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* @default 'summary'
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*/
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mode?: MeasureMemoryMode | undefined;
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/**
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* @default 'default'
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*/
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execution?: "default" | "eager" | undefined;
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}
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interface MemoryMeasurement {
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total: {
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jsMemoryEstimate: number;
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jsMemoryRange: [number, number];
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};
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}
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/**
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* Instances of the `vm.Script` class contain precompiled scripts that can be
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* executed in specific contexts.
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* @since v0.3.1
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*/
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class Script {
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constructor(code: string, options?: ScriptOptions | string);
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/**
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* Runs the compiled code contained by the `vm.Script` object within the given`contextifiedObject` and returns the result. Running code does not have access
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* to local scope.
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*
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* The following example compiles code that increments a global variable, sets
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* the value of another global variable, then execute the code multiple times.
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* The globals are contained in the `context` object.
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*
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* ```js
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* const vm = require('node:vm');
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*
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* const context = {
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* animal: 'cat',
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* count: 2,
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* };
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*
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* const script = new vm.Script('count += 1; name = "kitty";');
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*
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* vm.createContext(context);
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* for (let i = 0; i < 10; ++i) {
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* script.runInContext(context);
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* }
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*
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* console.log(context);
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* // Prints: { animal: 'cat', count: 12, name: 'kitty' }
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* ```
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*
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* Using the `timeout` or `breakOnSigint` options will result in new event loops
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* and corresponding threads being started, which have a non-zero performance
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* overhead.
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* @since v0.3.1
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* @param contextifiedObject A `contextified` object as returned by the `vm.createContext()` method.
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* @return the result of the very last statement executed in the script.
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*/
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runInContext(contextifiedObject: Context, options?: RunningScriptOptions): any;
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/**
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* First contextifies the given `contextObject`, runs the compiled code contained
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* by the `vm.Script` object within the created context, and returns the result.
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* Running code does not have access to local scope.
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*
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* The following example compiles code that sets a global variable, then executes
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* the code multiple times in different contexts. The globals are set on and
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* contained within each individual `context`.
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*
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* ```js
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* const vm = require('node:vm');
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*
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* const script = new vm.Script('globalVar = "set"');
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*
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* const contexts = [{}, {}, {}];
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* contexts.forEach((context) => {
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* script.runInNewContext(context);
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* });
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*
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* console.log(contexts);
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* // Prints: [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]
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* ```
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* @since v0.3.1
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* @param contextObject An object that will be `contextified`. If `undefined`, a new object will be created.
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* @return the result of the very last statement executed in the script.
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*/
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runInNewContext(contextObject?: Context, options?: RunningScriptInNewContextOptions): any;
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/**
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* Runs the compiled code contained by the `vm.Script` within the context of the
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* current `global` object. Running code does not have access to local scope, but _does_ have access to the current `global` object.
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*
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* The following example compiles code that increments a `global` variable then
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* executes that code multiple times:
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*
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* ```js
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* const vm = require('node:vm');
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*
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* global.globalVar = 0;
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*
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* const script = new vm.Script('globalVar += 1', { filename: 'myfile.vm' });
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*
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* for (let i = 0; i < 1000; ++i) {
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* script.runInThisContext();
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* }
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*
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* console.log(globalVar);
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*
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* // 1000
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* ```
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* @since v0.3.1
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* @return the result of the very last statement executed in the script.
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*/
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runInThisContext(options?: RunningScriptOptions): any;
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/**
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* 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
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* time and any number of times.
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*
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* The code cache of the `Script` doesn't contain any JavaScript observable
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* states. The code cache is safe to be saved along side the script source and
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* used to construct new `Script` instances multiple times.
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*
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* Functions in the `Script` source can be marked as lazily compiled and they are
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* not compiled at construction of the `Script`. These functions are going to be
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* compiled when they are invoked the first time. The code cache serializes the
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* metadata that V8 currently knows about the `Script` that it can use to speed up
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* future compilations.
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*
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* ```js
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* const script = new vm.Script(`
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* function add(a, b) {
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* return a + b;
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* }
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*
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* const x = add(1, 2);
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* `);
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*
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* const cacheWithoutAdd = script.createCachedData();
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* // In `cacheWithoutAdd` the function `add()` is marked for full compilation
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* // upon invocation.
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*
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* script.runInThisContext();
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*
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* const cacheWithAdd = script.createCachedData();
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* // `cacheWithAdd` contains fully compiled function `add()`.
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* ```
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* @since v10.6.0
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*/
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createCachedData(): Buffer;
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/** @deprecated in favor of `script.createCachedData()` */
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cachedDataProduced?: boolean | undefined;
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/**
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* When `cachedData` is supplied to create the `vm.Script`, this value will be set
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* to either `true` or `false` depending on acceptance of the data by V8\.
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* Otherwise the value is `undefined`.
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* @since v5.7.0
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*/
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cachedDataRejected?: boolean | undefined;
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cachedData?: Buffer | undefined;
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/**
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* When the script is compiled from a source that contains a source map magic
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* comment, this property will be set to the URL of the source map.
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*
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* ```js
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* import vm from 'node:vm';
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*
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* const script = new vm.Script(`
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* function myFunc() {}
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* //# sourceMappingURL=sourcemap.json
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* `);
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*
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* console.log(script.sourceMapURL);
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* // Prints: sourcemap.json
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* ```
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* @since v19.1.0, v18.13.0
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*/
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sourceMapURL?: string | undefined;
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}
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/**
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* If given a `contextObject`, the `vm.createContext()` method will `prepare
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* that object` so that it can be used in calls to {@link runInContext} or `script.runInContext()`. Inside such scripts,
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* the `contextObject` will be the global object, retaining all of its existing
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* 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
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* will remain unchanged.
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*
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* ```js
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* const vm = require('node:vm');
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*
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* global.globalVar = 3;
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*
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* const context = { globalVar: 1 };
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* vm.createContext(context);
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*
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* vm.runInContext('globalVar *= 2;', context);
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*
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* console.log(context);
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* // Prints: { globalVar: 2 }
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*
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* console.log(global.globalVar);
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* // Prints: 3
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* ```
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*
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* If `contextObject` is omitted (or passed explicitly as `undefined`), a new,
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* empty `contextified` object will be returned.
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*
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* The `vm.createContext()` method is primarily useful for creating a single
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* context that can be used to run multiple scripts. For instance, if emulating a
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* web browser, the method can be used to create a single context representing a
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* window's global object, then run all `<script>` tags together within that
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* context.
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*
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* The provided `name` and `origin` of the context are made visible through the
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* Inspector API.
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* @since v0.3.1
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* @return contextified object.
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*/
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function createContext(sandbox?: Context, options?: CreateContextOptions): Context;
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/**
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* Returns `true` if the given `object` object has been `contextified` using {@link createContext}.
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* @since v0.11.7
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*/
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function isContext(sandbox: Context): boolean;
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/**
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* The `vm.runInContext()` method compiles `code`, runs it within the context of
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* the `contextifiedObject`, then returns the result. Running code does not have
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* access to the local scope. The `contextifiedObject` object _must_ have been
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* previously `contextified` using the {@link createContext} method.
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*
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* If `options` is a string, then it specifies the filename.
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*
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* The following example compiles and executes different scripts using a single `contextified` object:
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*
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* ```js
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* const vm = require('node:vm');
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*
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* const contextObject = { globalVar: 1 };
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* vm.createContext(contextObject);
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*
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* for (let i = 0; i < 10; ++i) {
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* vm.runInContext('globalVar *= 2;', contextObject);
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* }
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* console.log(contextObject);
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* // Prints: { globalVar: 1024 }
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* ```
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* @since v0.3.1
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* @param code The JavaScript code to compile and run.
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* @param contextifiedObject The `contextified` object that will be used as the `global` when the `code` is compiled and run.
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* @return the result of the very last statement executed in the script.
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*/
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function runInContext(code: string, contextifiedObject: Context, options?: RunningCodeOptions | string): any;
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/**
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* The `vm.runInNewContext()` first contextifies the given `contextObject` (or
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* creates a new `contextObject` if passed as `undefined`), compiles the `code`,
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* runs it within the created context, then returns the result. Running code
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* does not have access to the local scope.
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*
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* If `options` is a string, then it specifies the filename.
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*
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* The following example compiles and executes code that increments a global
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* variable and sets a new one. These globals are contained in the `contextObject`.
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*
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* ```js
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* const vm = require('node:vm');
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*
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* const contextObject = {
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* animal: 'cat',
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* count: 2,
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* };
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*
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* vm.runInNewContext('count += 1; name = "kitty"', contextObject);
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* console.log(contextObject);
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* // Prints: { animal: 'cat', count: 3, name: 'kitty' }
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* ```
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* @since v0.3.1
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* @param code The JavaScript code to compile and run.
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* @param contextObject An object that will be `contextified`. If `undefined`, a new object will be created.
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* @return the result of the very last statement executed in the script.
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*/
|
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function runInNewContext(
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code: string,
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contextObject?: Context,
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options?: RunningCodeInNewContextOptions | string,
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): any;
|
|
/**
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* `vm.runInThisContext()` compiles `code`, runs it within the context of the
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* current `global` and returns the result. Running code does not have access to
|
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* local scope, but does have access to the current `global` object.
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*
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* If `options` is a string, then it specifies the filename.
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*
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* The following example illustrates using both `vm.runInThisContext()` and
|
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* the JavaScript [`eval()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval) function to run the same code:
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*
|
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* ```js
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* const vm = require('node:vm');
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* let localVar = 'initial value';
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*
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* const vmResult = vm.runInThisContext('localVar = "vm";');
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* console.log(`vmResult: '${vmResult}', localVar: '${localVar}'`);
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* // Prints: vmResult: 'vm', localVar: 'initial value'
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*
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* const evalResult = eval('localVar = "eval";');
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* console.log(`evalResult: '${evalResult}', localVar: '${localVar}'`);
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* // Prints: evalResult: 'eval', localVar: 'eval'
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* ```
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*
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* Because `vm.runInThisContext()` does not have access to the local scope,`localVar` is unchanged. In contrast,
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* [`eval()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval) _does_ have access to the
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* 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')`.
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*
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* ## Example: Running an HTTP server within a VM
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|
*
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|
* 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 `node:http` module the code passed
|
|
* to the context must either call `require('node:http')` on its own, or have a
|
|
* reference to the `node:http` module passed to it. For instance:
|
|
*
|
|
* ```js
|
|
* 'use strict';
|
|
* const vm = require('node:vm');
|
|
*
|
|
* const code = `
|
|
* ((require) => {
|
|
* const http = require('node: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?: RunningCodeOptions | 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?: readonly string[],
|
|
options?: CompileFunctionOptions,
|
|
): Function & {
|
|
cachedData?: Script["cachedData"] | undefined;
|
|
cachedDataProduced?: Script["cachedDataProduced"] | undefined;
|
|
cachedDataRejected?: Script["cachedDataRejected"] | undefined;
|
|
};
|
|
/**
|
|
* 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('node: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>;
|
|
interface ModuleEvaluateOptions {
|
|
timeout?: RunningScriptOptions["timeout"] | undefined;
|
|
breakOnSigint?: RunningScriptOptions["breakOnSigint"] | undefined;
|
|
}
|
|
type ModuleLinker = (
|
|
specifier: string,
|
|
referencingModule: Module,
|
|
extra: {
|
|
/** @deprecated Use `attributes` instead */
|
|
assert: ImportAttributes;
|
|
attributes: ImportAttributes;
|
|
},
|
|
) => Module | Promise<Module>;
|
|
type ModuleStatus = "unlinked" | "linking" | "linked" | "evaluating" | "evaluated" | "errored";
|
|
/**
|
|
* This feature is only available with the `--experimental-vm-modules` command
|
|
* flag enabled.
|
|
*
|
|
* The `vm.Module` class provides a low-level interface for using
|
|
* ECMAScript modules in VM contexts. It is the counterpart of the `vm.Script`class that closely mirrors [Module Record](https://262.ecma-international.org/14.0/#sec-abstract-module-records) s as
|
|
* defined in the ECMAScript
|
|
* specification.
|
|
*
|
|
* Unlike `vm.Script` however, every `vm.Module` object is bound to a context from
|
|
* its creation. Operations on `vm.Module` objects are intrinsically asynchronous,
|
|
* in contrast with the synchronous nature of `vm.Script` objects. The use of
|
|
* 'async' functions can help with manipulating `vm.Module` objects.
|
|
*
|
|
* Using a `vm.Module` object requires three distinct steps: creation/parsing,
|
|
* linking, and evaluation. These three steps are illustrated in the following
|
|
* example.
|
|
*
|
|
* This implementation lies at a lower level than the `ECMAScript Module
|
|
* loader`. There is also no way to interact with the Loader yet, though
|
|
* support is planned.
|
|
*
|
|
* ```js
|
|
* import vm from 'node:vm';
|
|
*
|
|
* const contextifiedObject = vm.createContext({
|
|
* secret: 42,
|
|
* print: console.log,
|
|
* });
|
|
*
|
|
* // Step 1
|
|
* //
|
|
* // Create a Module by constructing a new `vm.SourceTextModule` object. This
|
|
* // parses the provided source text, throwing a `SyntaxError` if anything goes
|
|
* // wrong. By default, a Module is created in the top context. But here, we
|
|
* // specify `contextifiedObject` as the context this Module belongs to.
|
|
* //
|
|
* // Here, we attempt to obtain the default export from the module "foo", and
|
|
* // put it into local binding "secret".
|
|
*
|
|
* const bar = new vm.SourceTextModule(`
|
|
* import s from 'foo';
|
|
* s;
|
|
* print(s);
|
|
* `, { context: contextifiedObject });
|
|
*
|
|
* // Step 2
|
|
* //
|
|
* // "Link" the imported dependencies of this Module to it.
|
|
* //
|
|
* // The provided linking callback (the "linker") accepts two arguments: the
|
|
* // parent module (`bar` in this case) and the string that is the specifier of
|
|
* // the imported module. The callback is expected to return a Module that
|
|
* // corresponds to the provided specifier, with certain requirements documented
|
|
* // in `module.link()`.
|
|
* //
|
|
* // If linking has not started for the returned Module, the same linker
|
|
* // callback will be called on the returned Module.
|
|
* //
|
|
* // Even top-level Modules without dependencies must be explicitly linked. The
|
|
* // callback provided would never be called, however.
|
|
* //
|
|
* // The link() method returns a Promise that will be resolved when all the
|
|
* // Promises returned by the linker resolve.
|
|
* //
|
|
* // Note: This is a contrived example in that the linker function creates a new
|
|
* // "foo" module every time it is called. In a full-fledged module system, a
|
|
* // cache would probably be used to avoid duplicated modules.
|
|
*
|
|
* async function linker(specifier, referencingModule) {
|
|
* if (specifier === 'foo') {
|
|
* return new vm.SourceTextModule(`
|
|
* // The "secret" variable refers to the global variable we added to
|
|
* // "contextifiedObject" when creating the context.
|
|
* export default secret;
|
|
* `, { context: referencingModule.context });
|
|
*
|
|
* // Using `contextifiedObject` instead of `referencingModule.context`
|
|
* // here would work as well.
|
|
* }
|
|
* throw new Error(`Unable to resolve dependency: ${specifier}`);
|
|
* }
|
|
* await bar.link(linker);
|
|
*
|
|
* // Step 3
|
|
* //
|
|
* // Evaluate the Module. The evaluate() method returns a promise which will
|
|
* // resolve after the module has finished evaluating.
|
|
*
|
|
* // Prints 42.
|
|
* await bar.evaluate();
|
|
* ```
|
|
* @since v13.0.0, v12.16.0
|
|
* @experimental
|
|
*/
|
|
class Module {
|
|
/**
|
|
* The specifiers of all dependencies of this module. The returned array is frozen
|
|
* to disallow any changes to it.
|
|
*
|
|
* Corresponds to the `[[RequestedModules]]` field of [Cyclic Module Record](https://tc39.es/ecma262/#sec-cyclic-module-records) s in
|
|
* the ECMAScript specification.
|
|
*/
|
|
dependencySpecifiers: readonly string[];
|
|
/**
|
|
* If the `module.status` is `'errored'`, this property contains the exception
|
|
* thrown by the module during evaluation. If the status is anything else,
|
|
* accessing this property will result in a thrown exception.
|
|
*
|
|
* The value `undefined` cannot be used for cases where there is not a thrown
|
|
* exception due to possible ambiguity with `throw undefined;`.
|
|
*
|
|
* Corresponds to the `[[EvaluationError]]` field of [Cyclic Module Record](https://tc39.es/ecma262/#sec-cyclic-module-records) s
|
|
* in the ECMAScript specification.
|
|
*/
|
|
error: any;
|
|
/**
|
|
* The identifier of the current module, as set in the constructor.
|
|
*/
|
|
identifier: string;
|
|
context: Context;
|
|
/**
|
|
* The namespace object of the module. This is only available after linking
|
|
* (`module.link()`) has completed.
|
|
*
|
|
* Corresponds to the [GetModuleNamespace](https://tc39.es/ecma262/#sec-getmodulenamespace) abstract operation in the ECMAScript
|
|
* specification.
|
|
*/
|
|
namespace: Object;
|
|
/**
|
|
* The current status of the module. Will be one of:
|
|
*
|
|
* * `'unlinked'`: `module.link()` has not yet been called.
|
|
* * `'linking'`: `module.link()` has been called, but not all Promises returned
|
|
* by the linker function have been resolved yet.
|
|
* * `'linked'`: The module has been linked successfully, and all of its
|
|
* dependencies are linked, but `module.evaluate()` has not yet been called.
|
|
* * `'evaluating'`: The module is being evaluated through a `module.evaluate()` on
|
|
* itself or a parent module.
|
|
* * `'evaluated'`: The module has been successfully evaluated.
|
|
* * `'errored'`: The module has been evaluated, but an exception was thrown.
|
|
*
|
|
* Other than `'errored'`, this status string corresponds to the specification's [Cyclic Module Record](https://tc39.es/ecma262/#sec-cyclic-module-records)'s `[[Status]]` field. `'errored'`
|
|
* corresponds to`'evaluated'` in the specification, but with `[[EvaluationError]]` set to a
|
|
* value that is not `undefined`.
|
|
*/
|
|
status: ModuleStatus;
|
|
/**
|
|
* Evaluate the module.
|
|
*
|
|
* This must be called after the module has been linked; otherwise it will reject.
|
|
* It could be called also when the module has already been evaluated, in which
|
|
* case it will either do nothing if the initial evaluation ended in success
|
|
* (`module.status` is `'evaluated'`) or it will re-throw the exception that the
|
|
* initial evaluation resulted in (`module.status` is `'errored'`).
|
|
*
|
|
* This method cannot be called while the module is being evaluated
|
|
* (`module.status` is `'evaluating'`).
|
|
*
|
|
* Corresponds to the [Evaluate() concrete method](https://tc39.es/ecma262/#sec-moduleevaluation) field of [Cyclic Module Record](https://tc39.es/ecma262/#sec-cyclic-module-records) s in the
|
|
* ECMAScript specification.
|
|
* @return Fulfills with `undefined` upon success.
|
|
*/
|
|
evaluate(options?: ModuleEvaluateOptions): Promise<void>;
|
|
/**
|
|
* Link module dependencies. This method must be called before evaluation, and
|
|
* can only be called once per module.
|
|
*
|
|
* The function is expected to return a `Module` object or a `Promise` that
|
|
* eventually resolves to a `Module` object. The returned `Module` must satisfy the
|
|
* following two invariants:
|
|
*
|
|
* * It must belong to the same context as the parent `Module`.
|
|
* * Its `status` must not be `'errored'`.
|
|
*
|
|
* If the returned `Module`'s `status` is `'unlinked'`, this method will be
|
|
* recursively called on the returned `Module` with the same provided `linker`function.
|
|
*
|
|
* `link()` returns a `Promise` that will either get resolved when all linking
|
|
* instances resolve to a valid `Module`, or rejected if the linker function either
|
|
* throws an exception or returns an invalid `Module`.
|
|
*
|
|
* The linker function roughly corresponds to the implementation-defined [HostResolveImportedModule](https://tc39.es/ecma262/#sec-hostresolveimportedmodule) abstract operation in the
|
|
* ECMAScript
|
|
* specification, with a few key differences:
|
|
*
|
|
* * The linker function is allowed to be asynchronous while [HostResolveImportedModule](https://tc39.es/ecma262/#sec-hostresolveimportedmodule) is synchronous.
|
|
*
|
|
* The actual [HostResolveImportedModule](https://tc39.es/ecma262/#sec-hostresolveimportedmodule) implementation used during module
|
|
* linking is one that returns the modules linked during linking. Since at
|
|
* that point all modules would have been fully linked already, the [HostResolveImportedModule](https://tc39.es/ecma262/#sec-hostresolveimportedmodule) implementation is fully synchronous per
|
|
* specification.
|
|
*
|
|
* Corresponds to the [Link() concrete method](https://tc39.es/ecma262/#sec-moduledeclarationlinking) field of [Cyclic Module Record](https://tc39.es/ecma262/#sec-cyclic-module-records) s in
|
|
* the ECMAScript specification.
|
|
*/
|
|
link(linker: ModuleLinker): Promise<void>;
|
|
}
|
|
interface SourceTextModuleOptions {
|
|
/**
|
|
* String used in stack traces.
|
|
* @default 'vm:module(i)' where i is a context-specific ascending index.
|
|
*/
|
|
identifier?: string | undefined;
|
|
cachedData?: ScriptOptions["cachedData"] | undefined;
|
|
context?: Context | undefined;
|
|
lineOffset?: BaseOptions["lineOffset"] | undefined;
|
|
columnOffset?: BaseOptions["columnOffset"] | undefined;
|
|
/**
|
|
* Called during evaluation of this module to initialize the `import.meta`.
|
|
*/
|
|
initializeImportMeta?: ((meta: ImportMeta, module: SourceTextModule) => void) | undefined;
|
|
importModuleDynamically?: ScriptOptions["importModuleDynamically"] | undefined;
|
|
}
|
|
/**
|
|
* This feature is only available with the `--experimental-vm-modules` command
|
|
* flag enabled.
|
|
*
|
|
* The `vm.SourceTextModule` class provides the [Source Text Module Record](https://tc39.es/ecma262/#sec-source-text-module-records) as
|
|
* defined in the ECMAScript specification.
|
|
* @since v9.6.0
|
|
* @experimental
|
|
*/
|
|
class SourceTextModule extends Module {
|
|
/**
|
|
* Creates a new `SourceTextModule` instance.
|
|
* @param code JavaScript Module code to parse
|
|
*/
|
|
constructor(code: string, options?: SourceTextModuleOptions);
|
|
}
|
|
interface SyntheticModuleOptions {
|
|
/**
|
|
* String used in stack traces.
|
|
* @default 'vm:module(i)' where i is a context-specific ascending index.
|
|
*/
|
|
identifier?: string | undefined;
|
|
/**
|
|
* The contextified object as returned by the `vm.createContext()` method, to compile and evaluate this module in.
|
|
*/
|
|
context?: Context | undefined;
|
|
}
|
|
/**
|
|
* This feature is only available with the `--experimental-vm-modules` command
|
|
* flag enabled.
|
|
*
|
|
* The `vm.SyntheticModule` class provides the [Synthetic Module Record](https://heycam.github.io/webidl/#synthetic-module-records) as
|
|
* defined in the WebIDL specification. The purpose of synthetic modules is to
|
|
* provide a generic interface for exposing non-JavaScript sources to ECMAScript
|
|
* module graphs.
|
|
*
|
|
* ```js
|
|
* const vm = require('node:vm');
|
|
*
|
|
* const source = '{ "a": 1 }';
|
|
* const module = new vm.SyntheticModule(['default'], function() {
|
|
* const obj = JSON.parse(source);
|
|
* this.setExport('default', obj);
|
|
* });
|
|
*
|
|
* // Use `module` in linking...
|
|
* ```
|
|
* @since v13.0.0, v12.16.0
|
|
* @experimental
|
|
*/
|
|
class SyntheticModule extends Module {
|
|
/**
|
|
* Creates a new `SyntheticModule` instance.
|
|
* @param exportNames Array of names that will be exported from the module.
|
|
* @param evaluateCallback Called when the module is evaluated.
|
|
*/
|
|
constructor(
|
|
exportNames: string[],
|
|
evaluateCallback: (this: SyntheticModule) => void,
|
|
options?: SyntheticModuleOptions,
|
|
);
|
|
/**
|
|
* This method is used after the module is linked to set the values of exports. If
|
|
* it is called before the module is linked, an `ERR_VM_MODULE_STATUS` error
|
|
* will be thrown.
|
|
*
|
|
* ```js
|
|
* import vm from 'node:vm';
|
|
*
|
|
* const m = new vm.SyntheticModule(['x'], () => {
|
|
* m.setExport('x', 1);
|
|
* });
|
|
*
|
|
* await m.link(() => {});
|
|
* await m.evaluate();
|
|
*
|
|
* assert.strictEqual(m.namespace.x, 1);
|
|
* ```
|
|
* @since v13.0.0, v12.16.0
|
|
* @param name Name of the export to set.
|
|
* @param value The value to set the export to.
|
|
*/
|
|
setExport(name: string, value: any): void;
|
|
}
|
|
}
|
|
declare module "node:vm" {
|
|
export * from "vm";
|
|
}
|