910 lines
22 KiB
Markdown
910 lines
22 KiB
Markdown
## 8.12.1 (2024-07-03)
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### Bug fixes
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Fix a regression that caused Acorn to no longer run on Node versions <8.10.
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## 8.12.0 (2024-06-14)
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### New features
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Support ES2025 duplicate capture group names in regular expressions.
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### Bug fixes
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Include `VariableDeclarator` in the `AnyNode` type so that walker objects can refer to it without getting a type error.
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Properly raise a parse error for invalid `for`/`of` statements using `async` as binding name.
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Properly recognize \"use strict\" when preceded by a string with an escaped newline.
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Mark the `Parser` constructor as protected, not private, so plugins can extend it without type errors.
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Fix a bug where some invalid `delete` expressions were let through when the operand was parenthesized and `preserveParens` was enabled.
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Properly normalize line endings in raw strings of invalid template tokens.
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Properly track line numbers for escaped newlines in strings.
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Fix a bug that broke line number accounting after a template literal with invalid escape sequences.
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## 8.11.3 (2023-12-29)
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### Bug fixes
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Add `Function` and `Class` to the `AggregateType` type, so that they can be used in walkers without raising a type error.
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Make sure `onToken` get an `import` keyword token when parsing `import.meta`.
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Fix a bug where `.loc.start` could be undefined for `new.target` `meta` nodes.
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## 8.11.2 (2023-10-27)
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### Bug fixes
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Fix a bug that caused regular expressions after colon tokens to not be properly tokenized in some circumstances.
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## 8.11.1 (2023-10-26)
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### Bug fixes
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Fix a regression where `onToken` would receive 'name' tokens for 'new' keyword tokens.
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## 8.11.0 (2023-10-26)
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### Bug fixes
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Fix an issue where tokenizing (without parsing) an object literal with a property named `class` or `function` could, in some circumstance, put the tokenizer into an invalid state.
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Fix an issue where a slash after a call to a propery named the same as some keywords would be tokenized as a regular expression.
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### New features
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Upgrade to Unicode 15.1.
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Use a set of new, much more precise, TypeScript types.
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## 8.10.0 (2023-07-05)
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### New features
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Add a `checkPrivateFields` option that disables strict checking of private property use.
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## 8.9.0 (2023-06-16)
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### Bug fixes
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Forbid dynamic import after `new`, even when part of a member expression.
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### New features
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Add Unicode properties for ES2023.
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Add support for the `v` flag to regular expressions.
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## 8.8.2 (2023-01-23)
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### Bug fixes
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Fix a bug that caused `allowHashBang` to be set to false when not provided, even with `ecmaVersion >= 14`.
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Fix an exception when passing no option object to `parse` or `new Parser`.
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Fix incorrect parse error on `if (0) let\n[astral identifier char]`.
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## 8.8.1 (2022-10-24)
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### Bug fixes
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Make type for `Comment` compatible with estree types.
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## 8.8.0 (2022-07-21)
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### Bug fixes
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Allow parentheses around spread args in destructuring object assignment.
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Fix an issue where the tree contained `directive` properties in when parsing with a language version that doesn't support them.
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### New features
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Support hashbang comments by default in ECMAScript 2023 and later.
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## 8.7.1 (2021-04-26)
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### Bug fixes
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Stop handling `"use strict"` directives in ECMAScript versions before 5.
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Fix an issue where duplicate quoted export names in `export *` syntax were incorrectly checked.
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Add missing type for `tokTypes`.
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## 8.7.0 (2021-12-27)
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### New features
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Support quoted export names.
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Upgrade to Unicode 14.
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Add support for Unicode 13 properties in regular expressions.
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### Bug fixes
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Use a loop to find line breaks, because the existing regexp search would overrun the end of the searched range and waste a lot of time in minified code.
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## 8.6.0 (2021-11-18)
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### Bug fixes
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Fix a bug where an object literal with multiple `__proto__` properties would incorrectly be accepted if a later property value held an assigment.
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### New features
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Support class private fields with the `in` operator.
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## 8.5.0 (2021-09-06)
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### Bug fixes
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Improve context-dependent tokenization in a number of corner cases.
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Fix location tracking after a 0x2028 or 0x2029 character in a string literal (which before did not increase the line number).
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Fix an issue where arrow function bodies in for loop context would inappropriately consume `in` operators.
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Fix wrong end locations stored on SequenceExpression nodes.
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Implement restriction that `for`/`of` loop LHS can't start with `let`.
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### New features
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Add support for ES2022 class static blocks.
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Allow multiple input files to be passed to the CLI tool.
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## 8.4.1 (2021-06-24)
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### Bug fixes
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Fix a bug where `allowAwaitOutsideFunction` would allow `await` in class field initializers, and setting `ecmaVersion` to 13 or higher would allow top-level await in non-module sources.
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## 8.4.0 (2021-06-11)
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### New features
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A new option, `allowSuperOutsideMethod`, can be used to suppress the error when `super` is used in the wrong context.
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## 8.3.0 (2021-05-31)
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### New features
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Default `allowAwaitOutsideFunction` to true for ECMAScript 2022 an higher.
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Add support for the `d` ([indices](https://github.com/tc39/proposal-regexp-match-indices)) regexp flag.
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## 8.2.4 (2021-05-04)
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### Bug fixes
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Fix spec conformity in corner case 'for await (async of ...)'.
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## 8.2.3 (2021-05-04)
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### Bug fixes
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Fix an issue where the library couldn't parse 'for (async of ...)'.
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Fix a bug in UTF-16 decoding that would read characters incorrectly in some circumstances.
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## 8.2.2 (2021-04-29)
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### Bug fixes
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Fix a bug where a class field initialized to an async arrow function wouldn't allow await inside it. Same issue existed for generator arrow functions with yield.
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## 8.2.1 (2021-04-24)
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### Bug fixes
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Fix a regression introduced in 8.2.0 where static or async class methods with keyword names fail to parse.
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## 8.2.0 (2021-04-24)
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### New features
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Add support for ES2022 class fields and private methods.
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## 8.1.1 (2021-04-12)
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### Various
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Stop shipping source maps in the NPM package.
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## 8.1.0 (2021-03-09)
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### Bug fixes
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Fix a spurious error in nested destructuring arrays.
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### New features
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Expose `allowAwaitOutsideFunction` in CLI interface.
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Make `allowImportExportAnywhere` also apply to `import.meta`.
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## 8.0.5 (2021-01-25)
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### Bug fixes
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Adjust package.json to work with Node 12.16.0 and 13.0-13.6.
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## 8.0.4 (2020-10-05)
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### Bug fixes
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Make `await x ** y` an error, following the spec.
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Fix potentially exponential regular expression.
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## 8.0.3 (2020-10-02)
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### Bug fixes
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Fix a wasteful loop during `Parser` creation when setting `ecmaVersion` to `"latest"`.
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## 8.0.2 (2020-09-30)
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### Bug fixes
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Make the TypeScript types reflect the current allowed values for `ecmaVersion`.
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Fix another regexp/division tokenizer issue.
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## 8.0.1 (2020-08-12)
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### Bug fixes
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Provide the correct value in the `version` export.
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## 8.0.0 (2020-08-12)
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### Bug fixes
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Disallow expressions like `(a = b) = c`.
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Make non-octal escape sequences a syntax error in strict mode.
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### New features
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The package can now be loaded directly as an ECMAScript module in node 13+.
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Update to the set of Unicode properties from ES2021.
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### Breaking changes
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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.
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Some changes to method signatures that may be used by plugins.
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## 7.4.0 (2020-08-03)
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### New features
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Add support for logical assignment operators.
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Add support for numeric separators.
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## 7.3.1 (2020-06-11)
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### Bug fixes
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Make the string in the `version` export match the actual library version.
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## 7.3.0 (2020-06-11)
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### Bug fixes
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Fix a bug that caused parsing of object patterns with a property named `set` that had a default value to fail.
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### New features
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Add support for optional chaining (`?.`).
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## 7.2.0 (2020-05-09)
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### Bug fixes
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Fix precedence issue in parsing of async arrow functions.
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### New features
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Add support for nullish coalescing.
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Add support for `import.meta`.
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Support `export * as ...` syntax.
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Upgrade to Unicode 13.
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## 6.4.1 (2020-03-09)
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### Bug fixes
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More carefully check for valid UTF16 surrogate pairs in regexp validator.
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## 7.1.1 (2020-03-01)
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### Bug fixes
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Treat `\8` and `\9` as invalid escapes in template strings.
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Allow unicode escapes in property names that are keywords.
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Don't error on an exponential operator expression as argument to `await`.
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More carefully check for valid UTF16 surrogate pairs in regexp validator.
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## 7.1.0 (2019-09-24)
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### Bug fixes
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Disallow trailing object literal commas when ecmaVersion is less than 5.
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### New features
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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.
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## 7.0.0 (2019-08-13)
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### Breaking changes
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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).
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Makes 10 (ES2019) the default value for the `ecmaVersion` option.
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## 6.3.0 (2019-08-12)
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### New features
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`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.
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## 6.2.1 (2019-07-21)
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### Bug fixes
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Fix bug causing Acorn to treat some characters as identifier characters that shouldn't be treated as such.
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Fix issue where setting the `allowReserved` option to `"never"` allowed reserved words in some circumstances.
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## 6.2.0 (2019-07-04)
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### Bug fixes
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Improve valid assignment checking in `for`/`in` and `for`/`of` loops.
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Disallow binding `let` in patterns.
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### New features
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Support bigint syntax with `ecmaVersion` >= 11.
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Support dynamic `import` syntax with `ecmaVersion` >= 11.
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Upgrade to Unicode version 12.
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## 6.1.1 (2019-02-27)
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### Bug fixes
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Fix bug that caused parsing default exports of with names to fail.
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## 6.1.0 (2019-02-08)
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### Bug fixes
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Fix scope checking when redefining a `var` as a lexical binding.
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### New features
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Split up `parseSubscripts` to use an internal `parseSubscript` method to make it easier to extend with plugins.
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## 6.0.7 (2019-02-04)
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### Bug fixes
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Check that exported bindings are defined.
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Don't treat `\u180e` as a whitespace character.
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Check for duplicate parameter names in methods.
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Don't allow shorthand properties when they are generators or async methods.
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Forbid binding `await` in async arrow function's parameter list.
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## 6.0.6 (2019-01-30)
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### Bug fixes
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The content of class declarations and expressions is now always parsed in strict mode.
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Don't allow `let` or `const` to bind the variable name `let`.
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Treat class declarations as lexical.
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Don't allow a generator function declaration as the sole body of an `if` or `else`.
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Ignore `"use strict"` when after an empty statement.
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Allow string line continuations with special line terminator characters.
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Treat `for` bodies as part of the `for` scope when checking for conflicting bindings.
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Fix bug with parsing `yield` in a `for` loop initializer.
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Implement special cases around scope checking for functions.
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## 6.0.5 (2019-01-02)
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### Bug fixes
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Fix TypeScript type for `Parser.extend` and add `allowAwaitOutsideFunction` to options type.
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Don't treat `let` as a keyword when the next token is `{` on the next line.
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Fix bug that broke checking for parentheses around an object pattern in a destructuring assignment when `preserveParens` was on.
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## 6.0.4 (2018-11-05)
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### Bug fixes
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Further improvements to tokenizing regular expressions in corner cases.
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## 6.0.3 (2018-11-04)
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### Bug fixes
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Fix bug in tokenizing an expression-less return followed by a function followed by a regular expression.
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Remove stray symlink in the package tarball.
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## 6.0.2 (2018-09-26)
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### Bug fixes
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Fix bug where default expressions could fail to parse inside an object destructuring assignment expression.
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## 6.0.1 (2018-09-14)
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### Bug fixes
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Fix wrong value in `version` export.
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## 6.0.0 (2018-09-14)
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### Bug fixes
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Better handle variable-redefinition checks for catch bindings and functions directly under if statements.
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Forbid `new.target` in top-level arrow functions.
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Fix issue with parsing a regexp after `yield` in some contexts.
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### New features
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The package now comes with TypeScript definitions.
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### Breaking changes
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The default value of the `ecmaVersion` option is now 9 (2018).
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Plugins work differently, and will have to be rewritten to work with this version.
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The loose parser and walker have been moved into separate packages (`acorn-loose` and `acorn-walk`).
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## 5.7.3 (2018-09-10)
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### Bug fixes
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Fix failure to tokenize regexps after expressions like `x.of`.
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Better error message for unterminated template literals.
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## 5.7.2 (2018-08-24)
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### Bug fixes
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Properly handle `allowAwaitOutsideFunction` in for statements.
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Treat function declarations at the top level of modules like let bindings.
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Don't allow async function declarations as the only statement under a label.
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## 5.7.0 (2018-06-15)
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### New features
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Upgraded to Unicode 11.
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## 5.6.0 (2018-05-31)
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### New features
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Allow U+2028 and U+2029 in string when ECMAVersion >= 10.
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Allow binding-less catch statements when ECMAVersion >= 10.
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Add `allowAwaitOutsideFunction` option for parsing top-level `await`.
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## 5.5.3 (2018-03-08)
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### Bug fixes
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A _second_ republish of the code in 5.5.1, this time with yarn, to hopefully get valid timestamps.
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## 5.5.2 (2018-03-08)
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### Bug fixes
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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.
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## 5.5.1 (2018-03-06)
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### Bug fixes
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Fix misleading error message for octal escapes in template strings.
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## 5.5.0 (2018-02-27)
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### New features
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The identifier character categorization is now based on Unicode version 10.
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Acorn will now validate the content of regular expressions, including new ES9 features.
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## 5.4.0 (2018-02-01)
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### Bug fixes
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Disallow duplicate or escaped flags on regular expressions.
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Disallow octal escapes in strings in strict mode.
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### New features
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Add support for async iteration.
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Add support for object spread and rest.
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## 5.3.0 (2017-12-28)
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### Bug fixes
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Fix parsing of floating point literals with leading zeroes in loose mode.
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Allow duplicate property names in object patterns.
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Don't allow static class methods named `prototype`.
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Disallow async functions directly under `if` or `else`.
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Parse right-hand-side of `for`/`of` as an assignment expression.
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Stricter parsing of `for`/`in`.
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Don't allow unicode escapes in contextual keywords.
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### New features
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Parsing class members was factored into smaller methods to allow plugins to hook into it.
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## 5.2.1 (2017-10-30)
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### Bug fixes
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Fix a token context corruption bug.
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## 5.2.0 (2017-10-30)
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### Bug fixes
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Fix token context tracking for `class` and `function` in property-name position.
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Make sure `%*` isn't parsed as a valid operator.
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Allow shorthand properties `get` and `set` to be followed by default values.
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Disallow `super` when not in callee or object position.
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|
|
### New features
|
|
|
|
Support [`directive` property](https://github.com/estree/estree/compare/b3de58c9997504d6fba04b72f76e6dd1619ee4eb...1da8e603237144f44710360f8feb7a9977e905e0) on directive expression statements.
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|
|
## 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.
|