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2 years ago
'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
exports.default = void 0;
function _util() {
const data = require('util');
_util = function () {
return data;
};
return data;
}
function _v() {
const data = require('v8');
_v = function () {
return data;
};
return data;
}
function _vm() {
const data = require('vm');
_vm = function () {
return data;
};
return data;
}
function _jestGetType() {
const data = require('jest-get-type');
_jestGetType = function () {
return data;
};
return data;
}
function _prettyFormat() {
const data = require('pretty-format');
_prettyFormat = function () {
return data;
};
return data;
}
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
} else {
obj[key] = value;
}
return obj;
}
const tick = (0, _util().promisify)(setImmediate);
class LeakDetector {
constructor(value) {
_defineProperty(this, '_isReferenceBeingHeld', void 0);
if ((0, _jestGetType().isPrimitive)(value)) {
throw new TypeError(
[
'Primitives cannot leak memory.',
'You passed a ' +
typeof value +
': <' +
(0, _prettyFormat().format)(value) +
'>'
].join(' ')
);
}
let weak;
try {
// eslint-disable-next-line import/no-extraneous-dependencies
weak = require('weak-napi');
} catch (err) {
if (!err || err.code !== 'MODULE_NOT_FOUND') {
throw err;
}
throw new Error(
'The leaking detection mechanism requires the "weak-napi" package to be installed and work. ' +
'Please install it as a dependency on your main project'
);
}
weak(value, () => (this._isReferenceBeingHeld = false));
this._isReferenceBeingHeld = true; // Ensure value is not leaked by the closure created by the "weak" callback.
value = null;
}
async isLeaking() {
this._runGarbageCollector(); // wait some ticks to allow GC to run properly, see https://github.com/nodejs/node/issues/34636#issuecomment-669366235
for (let i = 0; i < 10; i++) {
await tick();
}
return this._isReferenceBeingHeld;
}
_runGarbageCollector() {
const isGarbageCollectorHidden = !global.gc; // GC is usually hidden, so we have to expose it before running.
(0, _v().setFlagsFromString)('--expose-gc');
(0, _vm().runInNewContext)('gc')(); // The GC was not initially exposed, so let's hide it again.
if (isGarbageCollectorHidden) {
(0, _v().setFlagsFromString)('--no-expose-gc');
}
}
}
exports.default = LeakDetector;