Add error messages to all `debugAssert()` calls, for easier debugging.
When running Oxlint normally, we can easily figure out where errors are coming from stack traces, but in conformance test snapshot, line and column are removed from errors in the snapshot, so it's less easy.
Previously `context.languageOptions.globals` was `null` if no globals defined in config. This was a slight incompatibility with ESLint, which doesn't define `globals` property at all on `languageOptions` in this case.
Instead make `languageOptions.globals` an empty object. This should make no practical difference from what ESLint does, but avoids errors in rules if they do something like this:
```js
if (languageOptions.globals !== undefined) {
// This would throw if `globals` was `null` (as it used to be)
const hasWindow = languageOptions.globals.window !== "off";
}
```
Previously we had a pattern of destructuring properties of global objects into top-level vars. e.g.:
```js
const { keys: ObjectKeys, hasOwn } = Object,
{ isArray } = Array;
```
Doing this is more performant, but it makes the code harder to read.
Instead, write code normally, and use a TSDown plugin to convert:
```js
const keys = Object.keys(obj);
```
to:
```js
import { ObjectKeys } from "../utils/globals.ts";
const keys = ObjectKeys(obj);
```
Defining all the destructured globals in a single file (`utils/globals.ts`) is advantageous for bundle size. If the TSDown plugin created top level `const ObjectKeys = Object.keys;` statements in each file, then you can end up with this in bundle as minifier doesn't de-duplicate:
```js
const ObjectKeys = Object.keys;
const ObjectKeys$1 = Object.keys;
const ObjectKeys$2 = Object.keys;
```
The globals we use have to be manually added to `utils/globals.ts`, but TSDown plugin warns when this needs to be done, and doesn't generate a broken build in the meantime.
This plugin is run in debug builds too, so that the tests will catch any bugs.
- This PR implements a naive, inefficient solution to #16359.
- To establish current and expected behavior, this PR serializes
rust-resolved and -overridden globals once for every file.
## Future work
- [ ] Add test for globals from the `env` field. Implement support if
not currently supported.
- [ ] Optimization: we want to serialize `globals` for all files only
once at the start of the lint run.
## AI Usage
- This PR was drafted by Claude Sonnet 4.5 in Plan + Agent mode, then
manually reviewed and iterated on.
---------
Co-authored-by: overlookmotel <theoverlookmotel@gmail.com>
overlookmotel