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							- ## 6.4.0 (2019-11-26)
 
- ### 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.
 
- ## 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` >= 10.
 
- Support dynamic `import` syntax with `ecmaVersion` >= 10.
 
- 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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