Created
May 23, 2019 18:59
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Jest Runtime patch based on https://github.com/facebook/jest/pull/8331
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diff --git a/node_modules/jest-runtime/build/index.js b/node_modules/jest-runtime/build/index.js | |
index b8ef341..746ef70 100644 | |
--- a/node_modules/jest-runtime/build/index.js | |
+++ b/node_modules/jest-runtime/build/index.js | |
@@ -152,6 +152,8 @@ class Runtime { | |
_defineProperty(this, '_config', void 0); | |
+ _defineProperty(this, '_coreModulesProxyCache', void 0); | |
+ | |
_defineProperty(this, '_coverageOptions', void 0); | |
_defineProperty(this, '_currentlyExecutingModulePath', void 0); | |
@@ -206,6 +208,7 @@ class Runtime { | |
collectCoverageFrom: [], | |
collectCoverageOnlyFrom: null | |
}; | |
+ this._coreModulesProxyCache = Object.create(null); | |
this._currentlyExecutingModulePath = ''; | |
this._environment = environment; | |
this._explicitShouldMock = Object.create(null); | |
@@ -863,9 +866,44 @@ class Runtime { | |
_requireCoreModule(moduleName) { | |
if (moduleName === 'process') { | |
return this._environment.global.process; | |
+ } // return require(moduleName); | |
+ | |
+ const module = require(moduleName); | |
+ | |
+ const freezeCoreModules = true; | |
+ const freezeCoreModulesWhitelist = ['crypto']; | |
+ const verbose = true; | |
+ | |
+ if (!freezeCoreModules || freezeCoreModulesWhitelist.includes(moduleName)) { | |
+ return module; | |
+ } | |
+ | |
+ if (this._coreModulesProxyCache[moduleName]) { | |
+ return this._coreModulesProxyCache[moduleName]; | |
} | |
- return require(moduleName); | |
+ const set = (target, property, value, receiver) => { | |
+ if (typeof value !== 'function') { | |
+ return Reflect.set(target, property, value, receiver); | |
+ } | |
+ | |
+ if (verbose) { | |
+ console.warn( | |
+ new (_jestUtil()).ErrorWithStack( | |
+ `Trying to override method '${property.toString()}' of a frozen core module '${moduleName}'`, | |
+ set | |
+ ) | |
+ ); | |
+ } | |
+ | |
+ return true; | |
+ }; | |
+ | |
+ const proxy = new Proxy(module, { | |
+ set | |
+ }); | |
+ this._coreModulesProxyCache[moduleName] = proxy; | |
+ return proxy; | |
} | |
_generateMock(from, moduleName) { |
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