| Version | Changes |

| --- | --- |

| `v7.23.0` | Added `createImportExpressions` |

| `v7.16.0` | Added `startColumn` |

| `v7.15.0` | Added `attachComment` |

| `v7.7.0` | Added `errorRecovery` |

| `v7.5.0` | Added `allowUndeclaredExports` |

| `v7.2.0` | Added `createParenthesizedExpressions` |

| Version | Changes |

| --- | --- |

</details>

| Name | Code Example |

|------|--------------|

| `flow` ([repo](https://github.com/facebook/flow)) | `var a: string = "";` |

| `flowComments` ([docs](https://flow.org/en/docs/types/comments/)) | <code>/&ast;:: type Foo = \{...}; &ast;/</code> |

| `jsx` ([repo](https://facebook.github.io/jsx/)) | `<a attr="b">{s}</a>` |

| `typescript` ([repo](https://github.com/Microsoft/TypeScript)) | `var a: string = "";` |

| `v8intrinsic` | `%DebugPrint(foo);` |

| Version | Changes |

| --- | --- |

| `v7.23.0` | Added `sourcePhaseImports`, `deferredImportEvaluation`, `optionalChainingAssign` |

| `v7.22.0` | Enabled `regexpUnicodeSets` by default, added `importAttributes` |

| `v7.20.0` | Added `explicitResourceManagement`, `importReflection` |

| `v7.17.0` | Added `regexpUnicodeSets`, `destructuringPrivate`, `decoratorAutoAccessors` |

| `v7.15.0` | Added `hack` to the `proposal` option of `pipelineOperator`. Moved `topLevelAwait`, `privateIn` to Latest ECMAScript features |

| `v7.13.0` | Added `moduleBlocks` |

| `v7.12.0` | Added `classStaticBlock`, `moduleStringNames` |

| `v7.11.0` | Added `decimal` |

| `v7.10.0` | Added `privateIn` |

| `v7.9.0` | Added `recordAndTuple` |

| `v7.7.0` | Added `topLevelAwait` |

| `v7.4.0` | Added `partialApplication` |

| `v7.2.0` | Added `classPrivateMethods` |

| Name | Code Example |

| -------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- |

| `asyncDoExpressions` ([proposal](https://github.com/tc39/proposal-async-do-expressions)) | `async do { await requestAPI().json() }` |

| `decimal` ([proposal](https://github.com/tc39/proposal-decimal)) | `0.3m` |

| `decorators` ([proposal](https://github.com/tc39/proposal-decorators)) <br/> `decorators-legacy` | `@a class A {}` |

| `decoratorAutoAccessors` ([proposal](https://github.com/tc39/proposal-decorators)) | `class Example { @reactive accessor myBool = false; }` |

| `deferredImportEvaluation` ([proposal](https://github.com/tc39/proposal-defer-import-eval)) | `import defer * as ns from "dep";` |

| `destructuringPrivate` ([proposal](https://github.com/tc39/proposal-destructuring-private)) | `class Example { #x = 1; method() { const { #x: x } = this; } }` |

| `doExpressions` ([proposal](https://github.com/tc39/proposal-do-expressions)) | `var a = do { if (true) { 'hi'; } };` |

| `explicitResourceManagement` ([proposal](https://github.com/tc39/proposal-explicit-resource-management)) | `using reader = getReader()` |

| `exportDefaultFrom` ([proposal](https://github.com/tc39/ecmascript-export-default-from)) | `export v from "mod"` |

| `functionBind` ([proposal](https://github.com/zenparsing/es-function-bind)) | `a::b`, `::console.log` |

| `functionSent` ([proposal](https://github.com/tc39/proposal-function.sent)) | `function.sent` |

| `importAttributes` ([proposal](https://github.com/tc39/proposal-import-attributes)) <br/> `importAssertions` (⚠️ deprecated) | `import json from "./foo.json" with { type: "json" };` |

| `importReflection` ([proposal](https://github.com/tc39/proposal-import-reflection)) | `import module foo from "./foo.wasm";` |

| `moduleBlocks` ([proposal](https://github.com/tc39/proposal-js-module-blocks)) | `let m = module { export let y = 1; };` |

| `optionalChainingAssign` ([proposal](https://github.com/tc39/proposal-optional-chaining-assignment)) | `x?.prop = 2` |

| `partialApplication` ([proposal](https://github.com/babel/proposals/issues/32)) | `f(?, a)` |

| `pipelineOperator` ([proposal](https://github.com/babel/proposals/issues/29)) | <code>a &#124;> b</code> |

| `recordAndTuple` ([proposal](https://github.com/tc39/proposal-record-tuple)) | `#{x: 1}`, `#[1, 2]` |

| `sourcePhaseImports` ([proposal](https://github.com/tc39/proposal-source-phase-imports)) | `import source x from "./x"` |

| `throwExpressions` ([proposal](https://github.com/babel/proposals/issues/23)) | `() => throw new Error("")` |

| `numericSeparator` ([proposal](https://github.com/tc39/proposal-numeric-separator)) | `1_000_000` |

| Version | Changes |

| --- | --- |

| `7.17.0` | Added `@@` and `^^` to the `topicToken` option of the `hack` pipeline operator |

| `7.16.0` | Added `disallowAmbiguousJSXLike` for `typescript` plugin. Added `^` to the `topicToken` option of the `hack` pipeline operators |

| `7.14.0` | Added `dts` for `typescript` plugin |

When `true`, allow parsing import attributes using the [deprecated](https://tc39.es/proposal-import-attributes/#sec-deprecated-assert-keyword-for-import-attributes) `assert` keyword. This matches the syntax originally supported by the `importAssertions` parser plugin.

By default decorators on exported classes can be placed either before or after the `export` keyword. When this option is set, decorators will only be allowed in the specified position.

```js title="JavaScript"

// decoratorsBeforeExport: true

@dec

export class C {}

// decoratorsBeforeExport: false

export @dec class C {}

```

:::caution

This option is deprecated and will be removed in a future version. Code that is valid when this option is explicitly set to `true` or `false` is also valid when this option is not set.