csstree v3.2.0 release notes

Added "sideEffects": false in package.json
Added list option to the parse() method to specify whether the parser should produce a List (by default, list: true) or an array (list: false) for node's children (e.g., SelectorList, Block, etc.)
Added support for Functional Notation in definition syntax (for now by wrapping function arguments into an implicit group when necessary, see #292)
Added support for stacked multipliers {A}? and {A,B}? according to spec in definition syntax parsing (#346)
Added math functions support in syntax matching (e.g., min(), max(), etc.) (#344)

Added onToken option to the parse() method, which can be either an array or a function:

When the value is an array, it is populated with objects { type, start, end } (token type, and its start and end offsets).

When the value is a function, it accepts type, start, end, and index parameters, and is invoked with a token API as this, enabling advanced token handling (see onToken). For example, the following demonstrates checking if all block tokens have matching pairs:

parse(css, {
    onToken(type, start, end, index) {
        if (this.isBlockOpenerTokenType(type)) {
            if (this.getBlockPairTokenIndex(index) === -1) {
                console.warn('No closing pair for', this.getTokenValue(index), this.getRangeLocation(start, end));
            }
        } else if (this.isBlockCloserTokenType(type)) {
            if (this.getBlockPairTokenIndex(index) === -1) {
                console.warn('No opening pair for', this.getTokenValue(index), this.getRangeLocation(start, end));
            }
        }
    }
});

Extended TokenStream with the following methods:
- getTokenEnd(tokenIndex) – returns the token's end offset by index, complementing getTokenStart(tokenIndex)
- getTokenType(tokenIndex) – returns the token's type by index
- isBlockOpenerTokenType(tokenType) – returns true for <function-token>, <(-token>, <[-token>, and <{-token>
- isBlockCloserTokenType(tokenType) – returns true for <)-token>, <]-token>, and <}-token>
- getBlockTokenPairIndex(tokenIndex) – returns the index of the pair token for a block, or -1 if no pair exists
Changed generate() to not auto insert whitespaces between tokens for raw values (#356)
Fixed fork() to extend node definitions instead of overriding them. For example, fork({ node: { Dimension: { generate() { /* ... */ } } } }) will now update only the generate() method on the Dimension node, while inheriting all other properties from the previous syntax definition.
Bumped mdn/data to 2.27.1 and various fixes in syntaxes