---
title: sass:meta
---

{% render 'documentation/snippets/built-in-module-status' %}

{% markdown %}
## Mixins
{% endmarkdown %}

{% function 'meta.load-css($url, $with: null)' %}
{% compatibility '1.23.0', false, null, false %}
Only Dart Sass currently supports this mixin.
{% endcompatibility %}

Loads the [module][] at `$url` and includes its CSS as though it were written
as the contents of this mixin. The `$with` parameter provides
[configuration][] for the modules; if it's passed, it must be a map from
variable names (without `$`) to the values of those variables to use in the
loaded module.

[module]: /documentation/at-rules/use
[configuration]: /documentation/at-rules/use#configuration

If `$url` is relative, it's interpreted as relative to the file in which
`meta.load-css()` is included.

**Like the [`@use` rule][]**:

[`@use` rule]: /documentation/at-rules/use

* This will only evaluate the given module once, even if it's loaded multiple
times in different ways.

* This cannot provide configuration to a module that's already been loaded,
whether or not it was already loaded with configuration.

**Unlike the [`@use` rule][]**:

* This doesn't make any members from the loaded module available in the
current module.

* This can be used anywhere in a stylesheet. It can even be nested within
style rules to create nested styles!

* The module URL being loaded can come from a variable and include
[interpolation][].

[interpolation]: /documentation/interpolation

{% headsUp %}
The `$url` parameter should be a string containing a URL like you'd pass to
the `@use` rule. It shouldn't be a CSS `url()`!
{% endheadsUp %}

{% codeExample 'load-css', false %}
// dark-theme/_code.scss
$border-contrast: false !default;

code {
  background-color: #6b717f;
  color: #d2e1dd;
  @if $border-contrast {
    border-color: #dadbdf;
  }
}
---
// style.scss
@use "sass:meta";

body.dark {
  @include meta.load-css("dark-theme/code",
      $with: ("border-contrast": true));
}
===
// dark-theme/_code.sass
$border-contrast: false !default

code
  background-color: #6b717f
  color: #d2e1dd
  @if $border-contrast
    border-color: #dadbdf
---
// style.sass
@use "sass:meta"

body.dark
  $configuration: ("border-contrast": true)
  @include meta.load-css("dark-theme/code", $with: $configuration)
===
body.dark code {
  background-color: #6b717f;
  color: #d2e1dd;
  border-color: #dadbdf;
}
{% endcodeExample %}
{% endfunction %}

{% markdown %}
## Functions
{% endmarkdown %}

{% function 'meta.calc-args($calc)', 'returns:list' %}
{% compatibility '1.40.0', false, null, false %}{% endcompatibility %}

Returns the arguments for the given [calculation].

[calculation]: /documentation/values/calculations

If an argument is a number or a nested calculation, it's returned as that
type. Otherwise, it's returned as an unquoted string.

{% codeExample 'calc-args', false %}
@debug meta.calc-args(calc(100px + 10%)); // unquote("100px + 10%")
@debug meta.calc-args(clamp(50px, var(--width), 1000px)); // 50px, unquote("var(--width)"), 1000px
===
@debug meta.calc-args(calc(100px + 10%))  // unquote("100px + 10%")
@debug meta.calc-args(clamp(50px, var(--width), 1000px))  // 50px, unquote("var(--width)"), 1000px
{% endcodeExample %}
{% endfunction %}

{% function 'meta.calc-name($calc)', 'returns:quoted string' %}
{% compatibility '1.40.0', false, null, false %}{% endcompatibility %}

Returns the name of the given [calculation].

[calculation]: /documentation/values/calculations

{% codeExample 'calc-name', false %}
@debug meta.calc-name(calc(100px + 10%)); // "calc"
@debug meta.calc-name(clamp(50px, var(--width), 1000px)); // "clamp"
===
@debug meta.calc-name(calc(100px + 10%))  // "calc"
@debug meta.calc-name(clamp(50px, var(--width), 1000px))  // "clamp"
{% endcodeExample %}
{% endfunction %}

{% function 'meta.call($function, $args...)', 'call($function, $args...)' %}
{% render 'documentation/snippets/call-impl-status' %}

Invokes `$function` with `$args` and returns the result.

The `$function` should be a [function][] returned by
[`meta.get-function()`][].

[function]: /documentation/values/functions
[`meta.get-function()`]: #get-function

{% render 'code-snippets/example-first-class-function' %}
{% endfunction %}

{% function 'meta.content-exists()', 'content-exists()', 'returns:boolean' %}
Returns whether the current mixin was passed a [`@content` block][].

[`@content` block]: /documentation/at-rules/mixin#content-blocks

Throws an error if called outside of a mixin.

{% codeExample 'content-exists', false %}
@mixin debug-content-exists {
  @debug meta.content-exists();
  @content;
}

@include debug-content-exists; // false
@include debug-content-exists { // true
  // Content!
}
===
@mixin debug-content-exists
  @debug meta.content-exists()
  @content


@include debug-content-exists  // false
@include debug-content-exists   // true
  // Content!
{% endcodeExample %}
{% endfunction %}

{% function 'meta.feature-exists($feature)', 'feature-exists($feature)', 'returns:boolean' %}
Returns whether the current Sass implementation supports `$feature`.

The `$feature` must be a string. The currently recognized features are:

* `global-variable-shadowing`, which means that a local variable will
  [shadow][] a global variable unless it has the `!global` flag.
* `extend-selector-pseudoclass`, which means that the [`@extend` rule][] will
  affect selectors nested in pseudo-classes like `:not()`.
* `units-level3`, which means that [unit arithmetic][] supports units defined
  in [CSS Values and Units Level 3][].
* `at-error`, which means that the [`@error` rule][] is supported.
* `custom-property`, which means that [custom property declaration][] values
  don't support any [expressions][] other than [interpolation][].

[shadow]: /documentation/variables#shadowing
[`@extend` rule]: /documentation/at-rules/extend
[unit arithmetic]: /documentation/values/numbers#units
[CSS Values and Units Level 3]: http://www.w3.org/TR/css3-values
[`@error` rule]: /documentation/at-rules/error
[custom property declaration]: /documentation/style-rules/declarations#custom-properties
[expressions]: /documentation/syntax/structure#expressions
[interpolation]: /documentation/interpolation

Returns `false` for any unrecognized `$feature`.

{% codeExample 'feature-exists', false %}
@debug meta.feature-exists("at-error"); // true
@debug meta.feature-exists("unrecognized"); // false
===
@debug meta.feature-exists("at-error")  // true
@debug meta.feature-exists("unrecognized")  // false
{% endcodeExample %}
{% endfunction %}

{% function 'meta.function-exists($name, $module: null)', 'function-exists($name)', 'returns:boolean' %}
Returns whether a function named `$name` is defined, either as a built-in
function or a user-defined function.

If `$module` is passed, this also checks the module named `$module` for the
function definition. `$module` must be a string matching the namespace of a
[`@use` rule][] in the current file.

[`@use` rule]: /documentation/at-rules/use

{% codeExample 'function-exists', false %}
@use "sass:math";

@debug meta.function-exists("div", "math"); // true
@debug meta.function-exists("scale-color"); // true
@debug meta.function-exists("add"); // false

@function add($num1, $num2) {
  @return $num1 + $num2;
}
@debug meta.function-exists("add"); // true
===
@use "sass:math"

@debug meta.function-exists("div", "math")  // true
@debug meta.function-exists("scale-color")  // true
@debug meta.function-exists("add")  // false

@function add($num1, $num2)
  @return $num1 + $num2

@debug meta.function-exists("add")  // true
{% endcodeExample %}
{% endfunction %}

{% function 'meta.get-function($name, $css: false, $module: null)', 'get-function($name, $css: false, $module: null)', 'returns:function' %}
Returns the [function][] named `$name`.

[function]: /documentation/values/functions

If `$module` is `null`, this returns the function named `$name` without a
namespace (including [global built-in functions][]). Otherwise, `$module` must
be a string matching the namespace of a [`@use` rule][] in the current file,
in which case this returns the function in that module named `$name`.

[global built-in functions]: /documentation/modules#global-functions
[`@use` rule]: /documentation/at-rules/use

By default, this throws an error if `$name` doesn't refer to Sass function.
However, if `$css` is `true`, it instead returns a [plain CSS function][].

[user-defined]: /documentation/at-rules/function
[plain CSS function]: /documentation/at-rules/function#plain-css-functions

The returned function can be called using [`meta.call()`](#call).

{% render 'code-snippets/example-first-class-function' %}
{% endfunction %}

{% function 'meta.global-variable-exists($name, $module: null)', 'global-variable-exists($name, $module: null)', 'returns:boolean' %}
Returns whether a [global variable][] named `$name` (without the `$`) exists.

[global variable]: /documentation/variables#scope

If `$module` is `null`, this returns whether a variable named `$name` without
a namespace exists. Otherwise, `$module` must be a string matching the
namespace of a [`@use` rule][] in the current file, in which case this returns
whether that module has a variable named `$name`.

[`@use` rule]: /documentation/at-rules/use

See also [`meta.variable-exists()`](#variable-exists).

{% codeExample 'global-variable-exists', false %}
@debug meta.global-variable-exists("var1"); // false

$var1: value;
@debug meta.global-variable-exists("var1"); // true

h1 {
  // $var2 is local.
  $var2: value;
  @debug meta.global-variable-exists("var2"); // false
}
===
@debug meta.global-variable-exists("var1")  // false

$var1: value
@debug meta.global-variable-exists("var1")  // true

h1
  // $var2 is local.
  $var2: value
  @debug meta.global-variable-exists("var2")  // false
{% endcodeExample %}
{% endfunction %}

{% function 'meta.inspect($value)', 'inspect($value)', 'returns:unquoted string' %}
Returns a string representation of `$value`.

Returns a representation of *any* Sass value, not just those that can be
represented in CSS. As such, its return value is not guaranteed to be valid
CSS.

{% headsUp %}
This function is intended for debugging; its output format is not guaranteed
to be consistent across Sass versions or implementations.
{% endheadsUp %}

{% codeExample 'inspect', false %}
@debug meta.inspect(10px 20px 30px); // unquote("10px 20px 30px")
@debug meta.inspect(("width": 200px)); // unquote('("width": 200px)')
@debug meta.inspect(null); // unquote("null")
@debug meta.inspect("Helvetica"); // unquote('"Helvetica"')
===
@debug meta.inspect(10px 20px 30px)  // unquote("10px 20px 30px")
@debug meta.inspect(("width": 200px))  // unquote('("width": 200px)')
@debug meta.inspect(null)  // unquote("null")
@debug meta.inspect("Helvetica")  // unquote('"Helvetica"')
{% endcodeExample %}
{% endfunction %}

{% function 'meta.keywords($args)', 'keywords($args)', 'returns:map' %}
Returns the keywords passed to a mixin or function that takes [arbitrary
arguments][]. The `$args` argument must be an [argument list][].

[arbitrary arguments]: /documentation/at-rules/mixin#taking-arbitrary-arguments
[argument list]: /documentation/values/lists#argument-lists

The keywords are returned as a map from argument names as unquoted strings (not
including `$`) to the values of those arguments.

{% render 'code-snippets/example-mixin-arbitrary-keyword-arguments' %}
{% endfunction %}

{% function 'meta.mixin-exists($name, $module: null)', 'mixin-exists($name, $module: null)', 'returns:boolean' %}
Returns whether a [mixin][] named `$name` exists.

[mixin]: /documentation/at-rules/mixin

If `$module` is `null`, this returns whether a mixin named `$name` without a
namespace exists. Otherwise, `$module` must be a string matching the namespace
of a [`@use` rule][] in the current file, in which case this returns whether
that module has a mixin named `$name`.

[`@use` rule]: /documentation/at-rules/use

{% codeExample 'mixin-exists', false %}
@debug meta.mixin-exists("shadow-none"); // false

@mixin shadow-none {
  box-shadow: none;
}

@debug meta.mixin-exists("shadow-none"); // true
===
@debug meta.mixin-exists("shadow-none")  // false

@mixin shadow-none
  box-shadow: none


@debug meta.mixin-exists("shadow-none")  // true
{% endcodeExample %}
{% endfunction %}

{% function 'meta.module-functions($module)', 'returns:map' %}
{% render 'documentation/snippets/module-system-function-status' %}

Returns all the functions defined in a module, as a map from function names to
[function values][].

[function values]: /documentation/values/functions

The `$module` parameter must be a string matching the namespace of a [`@use`
rule][] in the current file.

[`@use` rule]: /documentation/at-rules/use

{% codeExample 'module-functions', false %}
// _functions.scss
@function pow($base, $exponent) {
  $result: 1;
  @for $_ from 1 through $exponent {
    $result: $result * $base;
  }
  @return $result;
}
---
@use "sass:map";
@use "sass:meta";

@use "functions";

@debug meta.module-functions("functions"); // ("pow": get-function("pow"))

@debug meta.call(map.get(meta.module-functions("functions"), "pow"), 3, 4); // 81
===
// _functions.sass
@function pow($base, $exponent)
  $result: 1
  @for $_ from 1 through $exponent
    $result: $result * $base

  @return $result
---
@use "sass:map"
@use "sass:meta"

@use "functions"

@debug meta.module-functions("functions") // ("pow": get-function("pow"))

@debug meta.call(map.get(meta.module-functions("functions"), "pow"), 3, 4) // 81
{% endcodeExample %}
{% endfunction %}

{% function 'meta.module-variables($module)', 'returns:map' %}
{% render 'documentation/snippets/module-system-function-status' %}

Returns all the variables defined in a module, as a map from variable names
(without `$`) to the values of those variables.

The `$module` parameter must be a string matching the namespace of a [`@use`
rule][] in the current file.

[`@use` rule]: /documentation/at-rules/use

{% codeExample 'module-variables', false %}
// _variables.scss
$hopbush: #c69;
$midnight-blue: #036;
$wafer: #e1d7d2;
---
@use "sass:meta";

@use "variables";

@debug meta.module-variables("variables");
// (
//   "hopbush": #c69,
//   "midnight-blue": #036,
//   "wafer": #e1d7d2
// )
===
// _variables.sass
$hopbush: #c69
$midnight-blue: #036
$wafer: #e1d7d2
---
@use "sass:meta"

@use "variables"

@debug meta.module-variables("variables")
// (
//   "hopbush": #c69,
//   "midnight-blue": #036,
//   "wafer": #e1d7d2
// )
{% endcodeExample %}
{% endfunction %}

{% function 'meta.type-of($value)', 'type-of($value)', 'returns:unquoted string' %}
Returns the type of `$value`.

This can return the following values:

* [`number`](/documentation/values/numbers)
* [`string`](/documentation/values/strings)
* [`color`](/documentation/values/colors)
* [`list`](/documentation/values/lists)
* [`map`](/documentation/values/maps)
* [`calculation`](/documentation/values/calculations)
* [`bool`](/documentation/values/booleans)
* [`null`](/documentation/values/null)
* [`function`](/documentation/values/functions)
* [`arglist`](/documentation/values/lists#argument-lists)

New possible values may be added in the future. It may return either `list` or
`map` for `()`, depending on whether or not it was returned by a
[map function][].

[map function]: /documentation/modules/map

{% codeExample 'type-of', false %}
@debug meta.type-of(10px); // number
@debug meta.type-of(10px 20px 30px); // list
@debug meta.type-of(()); // list
===
@debug meta.type-of(10px)  // number
@debug meta.type-of(10px 20px 30px)  // list
@debug meta.type-of(())  // list
{% endcodeExample %}
{% endfunction %}

{% function 'meta.variable-exists($name)', 'variable-exists($name)', 'returns:boolean' %}
Returns whether a variable named `$name` (without the `$`) exists in the
current [scope][].

[scope]: /documentation/variables#scope

See also [`meta.global-variable-exists()`](#global-variable-exists).

{% codeExample 'variable-exists', false %}
@debug meta.variable-exists("var1"); // false

$var1: value;
@debug meta.variable-exists("var1"); // true

h1 {
  // $var2 is local.
  $var2: value;
  @debug meta.variable-exists("var2"); // true
}
===
@debug meta.variable-exists("var1")  // false

$var1: value
@debug meta.variable-exists("var1")  // true

h1
  // $var2 is local.
  $var2: value
  @debug meta.variable-exists("var2")  // true
{% endcodeExample %}
{% endfunction %}