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1175b4bfa7
This PR makes ~all named intrinsics in all of our JavaScript processes non-modifiable. A named intrinsic is any property specified by the ECMAScript specification that exists on `globalThis` when the JavaScript process starts. We say that a property is non-modifiable if it is non-configurable and non-writable. We make exceptions for properties that meet any of the following criteria: 1. Properties that are non-configurable by the time `lockdown-run.js` is executed are not modified, because they can't be. 2. Properties that have accessor properties (`get` or `set`) are made non-configurable, but their writability cannot be modified, and is therefore left unchanged. It's unclear how many of the named intrinsics this applies to, if any, but it's good defensive programming, regardless. |
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| data | ||
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| jest | ||
| lib | ||
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| stub | ||
| unit-global | ||
| env.js | ||
| setup.js | ||