> ## Documentation Index
> Fetch the complete documentation index at: https://docs.solved.gg/llms.txt
> Use this file to discover all available pages before exploring further.

# ES built-ins

> Built-in object inventory for scripty ECMAScript compatibility (I1).

# ES built-ins

Inventory of standard built-in objects for initiative **I1**. Status vocabulary: [Status vocabulary](/scripty/v0.0.1-dev/reference/status-vocabulary).

Group delivery waves match [ES phases](/scripty/v0.0.1-dev/es/phases): **wave 1 = ES-5**, **wave 2 = ES-6**, **wave 3 = ES-7**.

## Wave 1 (ES-5)

| Built-in                                                                                                       | Status        | Priority notes                                 |
| -------------------------------------------------------------------------------------------------------------- | ------------- | ---------------------------------------------- |
| `Object` + static/prototype methods                                                                            | `partial`     | Property model must catch up                   |
| `Function`                                                                                                     | `partial`     | —                                              |
| `Array` + iteration helpers baseline                                                                           | `partial`     | Modern methods incomplete                      |
| `String`                                                                                                       | `partial`     | —                                              |
| `Number`                                                                                                       | `partial`     | —                                              |
| `Boolean`                                                                                                      | `partial`     | —                                              |
| `Math`                                                                                                         | `unsupported` | —                                              |
| `Date`                                                                                                         | `unsupported` | —                                              |
| `Error`, `TypeError`, `RangeError`, `SyntaxError`, `ReferenceError`, `URIError`, `EvalError`, `AggregateError` | `partial`     | Hierarchy incomplete                           |
| `JSON`                                                                                                         | `unsupported` | —                                              |
| Number/URI globals (`parseInt`, `parseFloat`, `isNaN`, `isFinite`, `encodeURI*`, `decodeURI*`)                 | `partial`     | Bring to spec alongside `Number`/`String` work |
| `eval`                                                                                                         | `unsupported` | Policy row: document fail-closed or implement  |

## Wave 2 (ES-6)

| Built-in                                                             | Status        | Priority notes                                 |
| -------------------------------------------------------------------- | ------------- | ---------------------------------------------- |
| `Promise` (+ `all`, `race`, `any`, `allSettled`, `withResolvers`, …) | `partial`     | then/jobs exist                                |
| `Symbol` (+ well-known symbols)                                      | `unsupported` | —                                              |
| `Map`                                                                | `unsupported` | —                                              |
| `Set`                                                                | `unsupported` | —                                              |
| `WeakMap`                                                            | `unsupported` | —                                              |
| `WeakSet`                                                            | `unsupported` | —                                              |
| `WeakRef` / `FinalizationRegistry`                                   | `unsupported` | Coordinate with GC design                      |
| `RegExp`                                                             | `unsupported` | Large surface; plan early                      |
| `ArrayBuffer`                                                        | `unsupported` | —                                              |
| `SharedArrayBuffer`                                                  | `unsupported` | Threading policy TBD; may refuse until workers |
| `DataView`                                                           | `unsupported` | —                                              |
| TypedArrays (`Int8Array` … `Float64Array`, `BigInt64Array`, …)       | `unsupported` | —                                              |
| `Atomics`                                                            | `unsupported` | Depends on SAB policy                          |

## Wave 3 (ES-7 + edition deltas)

| Built-in / feature                            | Status        | Priority notes                                                   |
| --------------------------------------------- | ------------- | ---------------------------------------------------------------- |
| `Proxy`                                       | `unsupported` | —                                                                |
| `Reflect`                                     | `unsupported` | —                                                                |
| GeneratorFunction / Generator prototype       | `unsupported` | —                                                                |
| AsyncFunction / AsyncGenerator                | `unsupported` | —                                                                |
| `%IteratorPrototype%` + Iterator helpers      | `unsupported` | ES2025+                                                          |
| `Set` methods (union, intersection, …)        | `unsupported` | ES2025+                                                          |
| `Iterator` global (if present in pin)         | `unsupported` | Track edition text                                               |
| `Intl` (`Intl.DateTimeFormat`, …)             | `unsupported` | **Decision:** implement for gate **or** mark refused (out of I1) |
| `Temporal` (if normative in pin / host ships) | `unsupported` | Confirm against ES2026 pin; refuse if still separate             |

## Globals (realm)

| Global             | Status      | Notes                                         |
| ------------------ | ----------- | --------------------------------------------- |
| `globalThis`       | `partial`   | —                                             |
| `undefined`        | `supported` | —                                             |
| `NaN` / `Infinity` | `partial`   | —                                             |
| `console`          | `partial`   | Host-ish; log/error/warn smokes — not ES core |

## Implementation notes

1. Prefer **spec algorithms** over “good enough” polyfill behavior.
2. Every method that lands needs at least one automated test (unit or Test262 path).
3. When a method is missing, it should be **absent** or throw a clear “not implemented” — not return wrong values.
4. Built-ins that allocate must participate in **GC roots** (see internal GC design).

## Tracking

Update this page and the [feature matrix](/scripty/v0.0.1-dev/es/feature-matrix) together. Do not let them diverge.


## Related topics

- [Status vocabulary](/scripty/v0.0.1-dev/reference/status-vocabulary.md)
- [ES phases](/scripty/v0.0.1-dev/es/phases.md)
- [I1 — ES Engine](/scripty/v0.0.1-dev/es/index.md)
- [ES feature matrix](/scripty/v0.0.1-dev/es/feature-matrix.md)
- [ES scope](/scripty/v0.0.1-dev/es/scope.md)