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Changes to CSS Tokenizer

4.0.0

January 14, 2026

Updated: Support for Node 20.19.0 or later (major).
Removed: commonjs API. In supported Node versions require(esm) will work without needing to make code changes.

3.0.4

May 27, 2025

align serializers with CSSOM

3.0.3

October 25, 2024

Fix input preprocessing

3.0.2

October 10, 2024

isTokenNumeric and isTokenWhiteSpaceOrComment now accept null and undefined as input, in parallel with other type predicates.

3.0.1

August 18, 2024

Updated the return type of nextToken() to indicate that it always returns a value.

3.0.0

August 3, 2024

Updated: Support for Node v18+ (major).
Improve performance.

2.4.1

July 5, 2024

Remove astNode that was erroneously added to the ParseError base class.

2.4.0

July 5, 2024

Expose ParseErrorMessage, the list of known parser error messages object to facilitate detection of specific cases
Add a specific ParseErrorWithToken subclass. This contains the associated token.

2.3.3

July 3, 2024

Fix tokenization of string-token containing a backslash followed by CRLF

2.3.2

June 29, 2024

Optimize cloneTokens

2.3.1

May 4, 2024

Fix escaping for the last code point in an ident sequence.

2.3.0

May 4, 2024

Add mutateUnit helper function
Add type guard helpers

2.2.4

March 13, 2024

Correctly tokenize negative zero -0 (for real this time)

2.2.3

December 31, 2023

Improve documentation.

2.2.2

December 15, 2023

Fix type definitions

2.2.1

September 24, 2023

Small performance improvements

2.2.0

July 24, 2023

Add support for unicode-range-token
Add signCharacter to DimensionToken, NumberToken and PercentageToken
Correctly tokenize negative zero -0

2.1.1

April 10, 2023

Document tokenize helper function

2.1.0

February 21, 2023

Add tokenize helper function

2.0.2

February 13, 2023

Relax isToken to match artificial tokens that correctly follow the interface.

2.0.1

January 28, 2023

Improve types declaration in package.json

2.0.0

January 19, 2023

Simplify Reader interface (breaking)
Change the ParseError interface, this is now a subclass of Error (breaking)
Remove the commentsAreTokens option as true was the only desirable value (breaking)
Improve performance

1.0.0

November 14, 2022

Initial version