setup-python/node_modules/jest-leak-detector/build/index.js
Danny McCormick 39c08a0eaa Initial pass
2019-06-26 21:12:00 -04:00

119 lines
2.5 KiB
JavaScript

'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
exports.default = void 0;
function _v() {
const data = _interopRequireDefault(require('v8'));
_v = function _v() {
return data;
};
return data;
}
function _vm() {
const data = _interopRequireDefault(require('vm'));
_vm = function _vm() {
return data;
};
return data;
}
function _prettyFormat() {
const data = _interopRequireDefault(require('pretty-format'));
_prettyFormat = function _prettyFormat() {
return data;
};
return data;
}
function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : {default: obj};
}
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;
}
class _default {
constructor(value) {
_defineProperty(this, '_isReferenceBeingHeld', void 0);
if (this._isPrimitive(value)) {
throw new TypeError(
[
'Primitives cannot leak memory.',
'You passed a ' +
typeof value +
': <' +
(0, _prettyFormat().default)(value) +
'>'
].join(' ')
);
}
let weak;
try {
// eslint-disable-next-line import/no-extraneous-dependencies
weak = require('weak');
} catch (err) {
if (!err || err.code !== 'MODULE_NOT_FOUND') {
throw err;
}
throw new Error(
'The leaking detection mechanism requires the "weak" 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;
}
isLeaking() {
this._runGarbageCollector();
return this._isReferenceBeingHeld;
}
_runGarbageCollector() {
const isGarbageCollectorHidden = !global.gc; // GC is usually hidden, so we have to expose it before running.
_v().default.setFlagsFromString('--expose-gc');
_vm().default.runInNewContext('gc')(); // The GC was not initially exposed, so let's hide it again.
if (isGarbageCollectorHidden) {
_v().default.setFlagsFromString('--no-expose-gc');
}
}
_isPrimitive(value) {
return value !== Object(value);
}
}
exports.default = _default;