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CHANGELOG.md
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			## 8.0.4 (2020-10-05)

			### Bug fixes

			Make `await x ** y` an error, following the spec.

			Fix potentially exponential regular expression.

			## 8.0.3 (2020-10-02)

			### Bug fixes

			Fix a wasteful loop during `Parser` creation when setting `ecmaVersion` to `"latest"`.

			## 8.0.2 (2020-09-30)

			### Bug fixes

			Make the TypeScript types reflect the current allowed values for `ecmaVersion`.

			Fix another regexp/division tokenizer issue.

			## 8.0.1 (2020-08-12)

			### Bug fixes

			Provide the correct value in the `version` export.

			## 8.0.0 (2020-08-12)

			### Bug fixes

			Disallow expressions like `(a = b) = c`.

			Make non-octal escape sequences a syntax error in strict mode.

			### New features

			The package can now be loaded directly as an ECMAScript module in node 13+.

			Update to the set of Unicode properties from ES2021.

			### Breaking changes

			The `ecmaVersion` option is now required. For the moment, omitting it will still work with a warning, but that will change in a future release.

			Some changes to method signatures that may be used by plugins.

			## 7.4.0 (2020-08-03)

			### New features

			Add support for logical assignment operators.

			Add support for numeric separators.

			## 7.3.1 (2020-06-11)

			### Bug fixes

			Make the string in the `version` export match the actual library version.

			## 7.3.0 (2020-06-11)

			### Bug fixes

			Fix a bug that caused parsing of object patterns with a property named `set` that had a default value to fail.

			### New features

			Add support for optional chaining (`?.`).

			## 7.2.0 (2020-05-09)

			### Bug fixes

			Fix precedence issue in parsing of async arrow functions.

			### New features

			Add support for nullish coalescing.

			Add support for `import.meta`.

			Support `export * as ...` syntax.

			Upgrade to Unicode 13.

			## 6.4.1 (2020-03-09)

			### Bug fixes

			More carefully check for valid UTF16 surrogate pairs in regexp validator.

			## 7.1.1 (2020-03-01)

			### Bug fixes

			Treat `\8` and `\9` as invalid escapes in template strings.

			Allow unicode escapes in property names that are keywords.

			Don't error on an exponential operator expression as argument to `await`.

			More carefully check for valid UTF16 surrogate pairs in regexp validator.

			## 7.1.0 (2019-09-24)

			### Bug fixes

			Disallow trailing object literal commas when ecmaVersion is less than 5.

			### New features

			Add a static `acorn` property to the `Parser` class that contains the entire module interface, to allow plugins to access the instance of the library that they are acting on.

			## 7.0.0 (2019-08-13)

			### Breaking changes

			Changes the node format for dynamic imports to use the `ImportExpression` node type, as defined in [ESTree](https://github.com/estree/estree/blob/master/es2020.md#importexpression).

			Makes 10 (ES2019) the default value for the `ecmaVersion` option.

			## 6.3.0 (2019-08-12)

			### New features

			`sourceType: "module"` can now be used even when `ecmaVersion` is less than 6, to parse module-style code that otherwise conforms to an older standard.

			## 6.2.1 (2019-07-21)

			### Bug fixes

			Fix bug causing Acorn to treat some characters as identifier characters that shouldn't be treated as such.

			Fix issue where setting the `allowReserved` option to `"never"` allowed reserved words in some circumstances.

			## 6.2.0 (2019-07-04)

			### Bug fixes

			Improve valid assignment checking in `for`/`in` and `for`/`of` loops.

			Disallow binding `let` in patterns.

			### New features

			Support bigint syntax with `ecmaVersion` >= 11.

			Support dynamic `import` syntax with `ecmaVersion` >= 11.

			Upgrade to Unicode version 12.

			## 6.1.1 (2019-02-27)

			### Bug fixes

			Fix bug that caused parsing default exports of with names to fail.

			## 6.1.0 (2019-02-08)

			### Bug fixes

			Fix scope checking when redefining a `var` as a lexical binding.

			### New features

			Split up `parseSubscripts` to use an internal `parseSubscript` method to make it easier to extend with plugins.

			## 6.0.7 (2019-02-04)

			### Bug fixes

			Check that exported bindings are defined.

			Don't treat `\u180e` as a whitespace character.

			Check for duplicate parameter names in methods.

			Don't allow shorthand properties when they are generators or async methods.

			Forbid binding `await` in async arrow function's parameter list.

			## 6.0.6 (2019-01-30)

			### Bug fixes

			The content of class declarations and expressions is now always parsed in strict mode.

			Don't allow `let` or `const` to bind the variable name `let`.

			Treat class declarations as lexical.

			Don't allow a generator function declaration as the sole body of an `if` or `else`.

			Ignore `"use strict"` when after an empty statement.

			Allow string line continuations with special line terminator characters.

			Treat `for` bodies as part of the `for` scope when checking for conflicting bindings.

			Fix bug with parsing `yield` in a `for` loop initializer.

			Implement special cases around scope checking for functions.

			## 6.0.5 (2019-01-02)

			### Bug fixes

			Fix TypeScript type for `Parser.extend` and add `allowAwaitOutsideFunction` to options type.

			Don't treat `let` as a keyword when the next token is `{` on the next line.

			Fix bug that broke checking for parentheses around an object pattern in a destructuring assignment when `preserveParens` was on.

			## 6.0.4 (2018-11-05)

			### Bug fixes

			Further improvements to tokenizing regular expressions in corner cases.

			## 6.0.3 (2018-11-04)

			### Bug fixes

			Fix bug in tokenizing an expression-less return followed by a function followed by a regular expression.

			Remove stray symlink in the package tarball.

			## 6.0.2 (2018-09-26)

			### Bug fixes

			Fix bug where default expressions could fail to parse inside an object destructuring assignment expression.

			## 6.0.1 (2018-09-14)

			### Bug fixes

			Fix wrong value in `version` export.

			## 6.0.0 (2018-09-14)

			### Bug fixes

			Better handle variable-redefinition checks for catch bindings and functions directly under if statements.

			Forbid `new.target` in top-level arrow functions.

			Fix issue with parsing a regexp after `yield` in some contexts.

			### New features

			The package now comes with TypeScript definitions.

			### Breaking changes

			The default value of the `ecmaVersion` option is now 9 (2018).

			Plugins work differently, and will have to be rewritten to work with this version.

			The loose parser and walker have been moved into separate packages (`acorn-loose` and `acorn-walk`).

			## 5.7.3 (2018-09-10)

			### Bug fixes

			Fix failure to tokenize regexps after expressions like `x.of`.

			Better error message for unterminated template literals.

			## 5.7.2 (2018-08-24)

			### Bug fixes

			Properly handle `allowAwaitOutsideFunction` in for statements.

			Treat function declarations at the top level of modules like let bindings.

			Don't allow async function declarations as the only statement under a label.

			## 5.7.0 (2018-06-15)

			### New features

			Upgraded to Unicode 11.

			## 5.6.0 (2018-05-31)

			### New features

			Allow U+2028 and U+2029 in string when ECMAVersion >= 10.

			Allow binding-less catch statements when ECMAVersion >= 10.

			Add `allowAwaitOutsideFunction` option for parsing top-level `await`.

			## 5.5.3 (2018-03-08)

			### Bug fixes

			A _second_ republish of the code in 5.5.1, this time with yarn, to hopefully get valid timestamps.

			## 5.5.2 (2018-03-08)

			### Bug fixes

			A republish of the code in 5.5.1 in an attempt to solve an issue with the file timestamps in the npm package being 0.

			## 5.5.1 (2018-03-06)

			### Bug fixes

			Fix misleading error message for octal escapes in template strings.

			## 5.5.0 (2018-02-27)

			### New features

			The identifier character categorization is now based on Unicode version 10.

			Acorn will now validate the content of regular expressions, including new ES9 features.

			## 5.4.0 (2018-02-01)

			### Bug fixes

			Disallow duplicate or escaped flags on regular expressions.

			Disallow octal escapes in strings in strict mode.

			### New features

			Add support for async iteration.

			Add support for object spread and rest.

			## 5.3.0 (2017-12-28)

			### Bug fixes

			Fix parsing of floating point literals with leading zeroes in loose mode.

			Allow duplicate property names in object patterns.

			Don't allow static class methods named `prototype`.

			Disallow async functions directly under `if` or `else`.

			Parse right-hand-side of `for`/`of` as an assignment expression.

			Stricter parsing of `for`/`in`.

			Don't allow unicode escapes in contextual keywords.

			### New features

			Parsing class members was factored into smaller methods to allow plugins to hook into it.

			## 5.2.1 (2017-10-30)

			### Bug fixes

			Fix a token context corruption bug.

			## 5.2.0 (2017-10-30)

			### Bug fixes

			Fix token context tracking for `class` and `function` in property-name position.

			Make sure `%*` isn't parsed as a valid operator.

			Allow shorthand properties `get` and `set` to be followed by default values.

			Disallow `super` when not in callee or object position.

			### New features

			Support [`directive` property](https://github.com/estree/estree/compare/b3de58c9997504d6fba04b72f76e6dd1619ee4eb...1da8e603237144f44710360f8feb7a9977e905e0) on directive expression statements.

			## 5.1.2 (2017-09-04)

			### Bug fixes

			Disable parsing of legacy HTML-style comments in modules.

			Fix parsing of async methods whose names are keywords.

			## 5.1.1 (2017-07-06)

			### Bug fixes

			Fix problem with disambiguating regexp and division after a class.

			## 5.1.0 (2017-07-05)

			### Bug fixes

			Fix tokenizing of regexps in an object-desctructuring `for`/`of` loop and after `yield`.

			Parse zero-prefixed numbers with non-octal digits as decimal.

			Allow object/array patterns in rest parameters.

			Don't error when `yield` is used as a property name.

			Allow `async` as a shorthand object property.

			### New features

			Implement the [template literal revision proposal](https://github.com/tc39/proposal-template-literal-revision) for ES9.

			## 5.0.3 (2017-04-01)

			### Bug fixes

			Fix spurious duplicate variable definition errors for named functions.

			## 5.0.2 (2017-03-30)

			### Bug fixes

			A binary operator after a parenthesized arrow expression is no longer incorrectly treated as an error.

			## 5.0.0 (2017-03-28)

			### Bug fixes

			Raise an error for duplicated lexical bindings.

			Fix spurious error when an assignement expression occurred after a spread expression.

			Accept regular expressions after `of` (in `for`/`of`), `yield` (in a generator), and braced arrow functions.

			Allow labels in front or `var` declarations, even in strict mode.

			### Breaking changes

			Parse declarations following `export default` as declaration nodes, not expressions. This means that class and function declarations nodes can now have `null` as their `id`.

			## 4.0.11 (2017-02-07)

			### Bug fixes

			Allow all forms of member expressions to be parenthesized as lvalue.

			## 4.0.10 (2017-02-07)

			### Bug fixes

			Don't expect semicolons after default-exported functions or classes, even when they are expressions.

			Check for use of `'use strict'` directives in non-simple parameter functions, even when already in strict mode.

			## 4.0.9 (2017-02-06)

			### Bug fixes

			Fix incorrect error raised for parenthesized simple assignment targets, so that `(x) = 1` parses again.

			## 4.0.8 (2017-02-03)

			### Bug fixes

			Solve spurious parenthesized pattern errors by temporarily erring on the side of accepting programs that our delayed errors don't handle correctly yet.

			## 4.0.7 (2017-02-02)

			### Bug fixes

			Accept invalidly rejected code like `(x).y = 2` again.

			Don't raise an error when a function _inside_ strict code has a non-simple parameter list.

			## 4.0.6 (2017-02-02)

			### Bug fixes

			Fix exponential behavior (manifesting itself as a complete hang for even relatively small source files) introduced by the new 'use strict' check.

			## 4.0.5 (2017-02-02)

			### Bug fixes

			Disallow parenthesized pattern expressions.

			Allow keywords as export names.

			Don't allow the `async` keyword to be parenthesized.

			Properly raise an error when a keyword contains a character escape.

			Allow `"use strict"` to appear after other string literal expressions.

			Disallow labeled declarations.

			## 4.0.4 (2016-12-19)

			### Bug fixes

			Fix crash when `export` was followed by a keyword that can't be
			exported.

			## 4.0.3 (2016-08-16)

			### Bug fixes

			Allow regular function declarations inside single-statement `if` branches in loose mode. Forbid them entirely in strict mode.

			Properly parse properties named `async` in ES2017 mode.

			Fix bug where reserved words were broken in ES2017 mode.

			## 4.0.2 (2016-08-11)

			### Bug fixes

			Don't ignore period or 'e' characters after octal numbers.

			Fix broken parsing for call expressions in default parameter values of arrow functions.

			## 4.0.1 (2016-08-08)

			### Bug fixes

			Fix false positives in duplicated export name errors.

			## 4.0.0 (2016-08-07)

			### Breaking changes

			The default `ecmaVersion` option value is now 7.

			A number of internal method signatures changed, so plugins might need to be updated.

			### Bug fixes

			The parser now raises errors on duplicated export names.

			`arguments` and `eval` can now be used in shorthand properties.

			Duplicate parameter names in non-simple argument lists now always produce an error.

			### New features

			The `ecmaVersion` option now also accepts year-style version numbers
			(2015, etc).

			Support for `async`/`await` syntax when `ecmaVersion` is >= 8.

			Support for trailing commas in call expressions when `ecmaVersion` is >= 8.

			## 3.3.0 (2016-07-25)

			### Bug fixes

			Fix bug in tokenizing of regexp operator after a function declaration.

			Fix parser crash when parsing an array pattern with a hole.

			### New features

			Implement check against complex argument lists in functions that enable strict mode in ES7.

			## 3.2.0 (2016-06-07)

			### Bug fixes

			Improve handling of lack of unicode regexp support in host
			environment.

			Properly reject shorthand properties whose name is a keyword.

			### New features

			Visitors created with `visit.make` now have their base as _prototype_, rather than copying properties into a fresh object.

			## 3.1.0 (2016-04-18)

			### Bug fixes

			Properly tokenize the division operator directly after a function expression.

			Allow trailing comma in destructuring arrays.

			## 3.0.4 (2016-02-25)

			### Fixes

			Allow update expressions as left-hand-side of the ES7 exponential operator.

			## 3.0.2 (2016-02-10)

			### Fixes

			Fix bug that accidentally made `undefined` a reserved word when parsing ES7.

			## 3.0.0 (2016-02-10)

			### Breaking changes

			The default value of the `ecmaVersion` option is now 6 (used to be 5).

			Support for comprehension syntax (which was dropped from the draft spec) has been removed.

			### Fixes

			`let` and `yield` are now “contextual keywords”, meaning you can mostly use them as identifiers in ES5 non-strict code.

			A parenthesized class or function expression after `export default` is now parsed correctly.

			### New features

			When `ecmaVersion` is set to 7, Acorn will parse the exponentiation operator (`**`).

			The identifier character ranges are now based on Unicode 8.0.0.

			Plugins can now override the `raiseRecoverable` method to override the way non-critical errors are handled.

			## 2.7.0 (2016-01-04)

			### Fixes

			Stop allowing rest parameters in setters.

			Disallow `y` rexexp flag in ES5.

			Disallow `\00` and `\000` escapes in strict mode.

			Raise an error when an import name is a reserved word.

			## 2.6.2 (2015-11-10)

			### Fixes

			Don't crash when no options object is passed.

			## 2.6.0 (2015-11-09)

			### Fixes

			Add `await` as a reserved word in module sources.

			Disallow `yield` in a parameter default value for a generator.

			Forbid using a comma after a rest pattern in an array destructuring.

			### New features

			Support parsing stdin in command-line tool.

			## 2.5.0 (2015-10-27)

			### Fixes

			Fix tokenizer support in the command-line tool.

			Stop allowing `new.target` outside of functions.

			Remove legacy `guard` and `guardedHandler` properties from try nodes.

			Stop allowing multiple `__proto__` properties on an object literal in strict mode.

			Don't allow rest parameters to be non-identifier patterns.

			Check for duplicate paramter names in arrow functions.

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