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Constructors

Properties

important: boolean

It represents a specificity of the declaration.

If true, the CSS declaration will have an important specifier.

const root = postcss.parse('a { color: black !important; color: red }')

root.first.first.important //=> true
root.first.last.important //=> undefined
parent: undefined | Container_<ChildNode>

It represents parent of the current node.

root.nodes[0].parent === root //=> true
prop: string

The property name for a CSS declaration.

const root = postcss.parse('a { color: black }')
const decl = root.first.first

decl.prop //=> 'color'

It represents unnecessary whitespace and characters present in the css source code.

Information to generate byte-to-byte equal node string as it was in the origin input.

The properties of the raws object are decided by parser, the default parser uses the following properties:

  • before: the space symbols before the node. It also stores * and _ symbols before the declaration (IE hack).
  • after: the space symbols after the last child of the node to the end of the node.
  • between: the symbols between the property and value for declarations, selector and { for rules, or last parameter and { for at-rules.
  • semicolon: contains true if the last child has an (optional) semicolon.
  • afterName: the space between the at-rule name and its parameters.
  • left: the space symbols between /* and the comment’s text.
  • right: the space symbols between the comment’s text and */.
  • important: the content of the important statement, if it is not just !important.

PostCSS filters out the comments inside selectors, declaration values and at-rule parameters but it stores the origin content in raws.

const root = postcss.parse('a {\n  color:black\n}')
root.first.first.raws //=> { before: '\n ', between: ':' }
source?: Source

It represents information related to origin of a node and is required for generating source maps.

The nodes that are created manually using the public APIs provided by PostCSS will have source undefined and will be absent in the source map.

For this reason, the plugin developer should consider duplicating nodes as the duplicate node will have the same source as the original node by default or assign source to a node created manually.

decl.source.input.from //=> '/home/ai/source.css'
decl.source.start //=> { line: 10, column: 2 }
decl.source.end //=> { line: 10, column: 12 }
// Incorrect method, source not specified!
const prefixed = postcss.decl({
prop: '-moz-' + decl.prop,
value: decl.value
})

// Correct method, source is inherited when duplicating.
const prefixed = decl.clone({
prop: '-moz-' + decl.prop
})
if (atrule.name === 'add-link') {
const rule = postcss.rule({
selector: 'a',
source: atrule.source
})

atrule.parent.insertBefore(atrule, rule)
}
type: "decl"

It represents type of a node in an abstract syntax tree.

A type of node helps in identification of a node and perform operation based on it's type.

const declaration = new Declaration({
prop: 'color',
value: 'black'
})

declaration.type //=> 'decl'
value: string

The property value for a CSS declaration.

Any CSS comments inside the value string will be filtered out. CSS comments present in the source value will be available in the raws property.

Assigning new value would ignore the comments in raws property while compiling node to string.

const root = postcss.parse('a { color: black }')
const decl = root.first.first

decl.value //=> 'black'
variable: boolean

It represents a getter that returns true if a declaration starts with -- or $, which are used to declare variables in CSS and SASS/SCSS.

const root = postcss.parse(':root { --one: 1 }')
const one = root.first.first

one.variable //=> true
const root = postcss.parse('$one: 1')
const one = root.first

one.variable //=> true

Methods

  • Insert new node after current node to current node’s parent.

    Just alias for node.parent.insertAfter(node, add).

    decl.after('color: black')
    

    Parameters

    Returns Declaration

    This node for methods chain.

  • It assigns properties to an existing node instance.

    decl.assign({ prop: 'word-wrap', value: 'break-word' })
    

    Parameters

    Returns Declaration

    this for method chaining.

  • Insert new node before current node to current node’s parent.

    Just alias for node.parent.insertBefore(node, add).

    decl.before('content: ""')
    

    Parameters

    Returns Declaration

    This node for methods chain.

  • cleanRaws(keepBetween?: boolean): void
  • Clear the code style properties for the node and its children.

    node.raws.before  //=> ' '
    node.cleanRaws()
    node.raws.before //=> undefined

    Parameters

    • Optional keepBetween: boolean

      Keep the raws.between symbols.

    Returns void

  • It creates clone of an existing node, which includes all the properties and their values, that includes raws but not type.

    decl.raws.before    //=> "\n  "
    const cloned = decl.clone({ prop: '-moz-' + decl.prop })
    cloned.raws.before //=> "\n "
    cloned.toString() //=> -moz-transform: scale(0)

    Parameters

    Returns Declaration

    Duplicate of the node instance.

  • Shortcut to clone the node and insert the resulting cloned node after the current node.

    Parameters

    Returns Declaration

    New node.

  • Shortcut to clone the node and insert the resulting cloned node before the current node.

    decl.cloneBefore({ prop: '-moz-' + decl.prop })
    

    Parameters

    Returns Declaration

    New node

  • It creates an instance of the class CssSyntaxError and parameters passed to this method are assigned to the error instance.

    The error instance will have description for the error, original position of the node in the source, showing line and column number.

    If any previous map is present, it would be used to get original position of the source.

    The Previous Map here is referred to the source map generated by previous compilation, example: Less, Stylus and Sass.

    This method returns the error instance instead of throwing it.

    if (!variables[name]) {
    throw decl.error(`Unknown variable ${name}`, { word: name })
    // CssSyntaxError: postcss-vars:a.sass:4:3: Unknown variable $black
    // color: $black
    // a
    // ^
    // background: white
    }

    Parameters

    • message: string

      Description for the error instance.

    • Optional options: Node.NodeErrorOptions

      Options for the error instance.

    Returns CssSyntaxError_

    Error instance is returned.

  • Returns the next child of the node’s parent. Returns undefined if the current node is the last child.

    if (comment.text === 'delete next') {
    const next = comment.next()
    if (next) {
    next.remove()
    }
    }

    Returns undefined | ChildNode

    Next node.

  • Get the position for a word or an index inside the node.

    Parameters

    Returns Position

    Position.

  • Convert string index to line/column.

    Parameters

    • index: number

      The symbol number in the node’s string.

    Returns Position

    Symbol position in file.

  • Returns the previous child of the node’s parent. Returns undefined if the current node is the first child.

    const annotation = decl.prev()
    if (annotation.type === 'comment') {
    readAnnotation(annotation.text)
    }

    Returns undefined | ChildNode

    Previous node.

  • Get the range for a word or start and end index inside the node. The start index is inclusive; the end index is exclusive.

    Parameters

    • Optional opts: Pick<WarningOptions, "index" | "word" | "endIndex">

      Options.

    Returns Range

    Range.

  • raw(prop: string, defaultType?: string): string
  • Returns a raws value. If the node is missing the code style property (because the node was manually built or cloned), PostCSS will try to autodetect the code style property by looking at other nodes in the tree.

    const root = postcss.parse('a { background: white }')
    root.nodes[0].append({ prop: 'color', value: 'black' })
    root.nodes[0].nodes[1].raws.before //=> undefined
    root.nodes[0].nodes[1].raw('before') //=> ' '

    Parameters

    • prop: string

      Name of code style property.

    • Optional defaultType: string

      Name of default value, it can be missed if the value is the same as prop.

    Returns string

    Code style value.

  • It removes the node from its parent and deletes its parent property.

    if (decl.prop.match(/^-webkit-/)) {
    decl.remove()
    }

    Returns Declaration

    this for method chaining.

  • Inserts node(s) before the current node and removes the current node.

    AtRule: {
    mixin: atrule => {
    atrule.replaceWith(mixinRules[atrule.params])
    }
    }

    Parameters

    Returns Declaration

    Current node to methods chain.

  • Finds the Root instance of the node’s tree.

    root.nodes[0].nodes[0].root() === root
    

    Returns Root_

    Root parent.

  • toJSON(): object
  • Fix circular links on JSON.stringify().

    Returns object

    Cleaned object.

  • It compiles the node to browser readable cascading style sheets string depending on it's type.

    new Rule({ selector: 'a' }).toString() //=> "a {}"
    

    Parameters

    Returns string

    CSS string of this node.

  • It is a wrapper for {@link Result#warn}, providing convenient way of generating warnings.

      Declaration: {
    bad: (decl, { result }) => {
    decl.warn(result, 'Deprecated property: bad')
    }
    }

    Parameters

    • result: Result_<Document_ | Root_>

      The Result instance that will receive the warning.

    • message: string

      Description for the warning.

    • Optional options: WarningOptions

      Options for the warning.

    Returns Warning_

    Warning instance is returned