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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);