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'use strict'; require('../common'); const assert = require('assert'); const vm = require('vm'); // https://github.com/nodejs/node/issues/10223 const ctx = vm.createContext(); // Define x with writable = false. vm.runInContext('Object.defineProperty(this, "x", { value: 42 })', ctx); assert.strictEqual(ctx.x, 42); assert.strictEqual(vm.runInContext('x', ctx), 42); vm.runInContext('x = 0', ctx); // Does not throw but x... assert.strictEqual(vm.runInContext('x', ctx), 42); // ...should be unaltered. assert.throws(() => vm.runInContext('"use strict"; x = 0', ctx), /Cannot assign to read only property 'x'/); assert.strictEqual(vm.runInContext('x', ctx), 42);