From ad782cdca84077c04435499f9a3e34676278be44 Mon Sep 17 00:00:00 2001
From: Connor Skees <connor1skees@gmail.com>
Date: Fri, 25 Aug 2023 03:58:02 +0000
Subject: [PATCH] add tests for first class mixins

---
 spec/core_functions/meta/accepts_content.hrx  |  40 ++
 spec/core_functions/meta/apply.hrx            |   1 +
 .../core_functions/meta/get_mixin/content.hrx |   1 +
 .../meta/get_mixin/different_module.hrx       | 137 +++++++
 .../meta/get_mixin/equality.hrx               |  74 ++++
 spec/core_functions/meta/get_mixin/error.hrx  | 262 ++++++++++++
 spec/core_functions/meta/get_mixin/meta.hrx   |  21 +
 .../meta/get_mixin/same_module.hrx            |  71 ++++
 spec/core_functions/meta/get_mixin/scope.hrx  |  47 +++
 spec/core_functions/meta/module_mixins.hrx    | 372 ++++++++++++++++++
 spec/core_functions/meta/type_of.hrx          |  12 +
 11 files changed, 1038 insertions(+)
 create mode 100644 spec/core_functions/meta/accepts_content.hrx
 create mode 100644 spec/core_functions/meta/apply.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/content.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/different_module.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/equality.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/error.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/meta.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/same_module.hrx
 create mode 100644 spec/core_functions/meta/get_mixin/scope.hrx
 create mode 100644 spec/core_functions/meta/module_mixins.hrx

diff --git a/spec/core_functions/meta/accepts_content.hrx b/spec/core_functions/meta/accepts_content.hrx
new file mode 100644
index 0000000000..89b5b7b6d7
--- /dev/null
+++ b/spec/core_functions/meta/accepts_content.hrx
@@ -0,0 +1,40 @@
+<===> accepts/direct-child/input.scss
+@use "sass:meta";
+
+@mixin foo() {
+    @content;
+}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> accepts/direct-child/output.css
+a {
+  b: true;
+}
+
+<===> accepts/nested-child/input.scss
+@use "sass:meta";
+
+@mixin foo() {
+    @if false {
+        @content;
+    }
+}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> accepts/nested-child/output.css
+a {
+  b: true;
+}
+
+<===> doesnt-accept/empty/input.scss
+@use "sass:meta";
+@mixin foo() {}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> doesnt-accept/empty/output.css
+a {
+  b: false;
+}
diff --git a/spec/core_functions/meta/apply.hrx b/spec/core_functions/meta/apply.hrx
new file mode 100644
index 0000000000..8826b5238d
--- /dev/null
+++ b/spec/core_functions/meta/apply.hrx
@@ -0,0 +1 @@
+// todo
\ No newline at end of file
diff --git a/spec/core_functions/meta/get_mixin/content.hrx b/spec/core_functions/meta/get_mixin/content.hrx
new file mode 100644
index 0000000000..8826b5238d
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/content.hrx
@@ -0,0 +1 @@
+// todo
\ No newline at end of file
diff --git a/spec/core_functions/meta/get_mixin/different_module.hrx b/spec/core_functions/meta/get_mixin/different_module.hrx
new file mode 100644
index 0000000000..22fb6a18b1
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/different_module.hrx
@@ -0,0 +1,137 @@
+<===>
+================================================================================
+<===> defined/input.scss
+@use "sass:meta";
+@use "foo";
+a {@include meta.apply(meta.get-mixin("foo", $module: "color"), #abcdef)}
+
+<===> chosen_prefix/foo.scss
+@mixin foo($color) {
+  b: red($color)
+}
+
+<===> defined/output.css
+a {
+  b: 171;
+}
+
+<===>
+================================================================================
+<===> chosen_prefix/input.scss
+@use "sass:meta";
+@use "foo" as a;
+b {@include meta.apply(meta.get-mixin("foo", $module: "a"), #abcdef)}
+
+<===> chosen_prefix/foo.scss
+@mixin foo($color) {
+  c: red($color)
+}
+
+<===> chosen_prefix/output.css
+b {
+  c: 171;
+}
+
+<===>
+================================================================================
+<===> through_use/input.scss
+@use "sass:meta";
+@use "other" as *;
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> through_use/other.scss
+@mixin add-two($v) {b: $v + 2}
+
+<===> through_use/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> through_forward/bare/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/bare/_midstream.scss
+@forward "upstream";
+
+<===> through_forward/bare/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/bare/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/as/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c-d))}
+
+<===> through_forward/as/_midstream.scss
+@forward "upstream" as c-*;
+
+<===> through_forward/as/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/as/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/show/_midstream.scss
+@forward "upstream" show c;
+
+<===> through_forward/show/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/show/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(d))}
+
+<===> through_forward/hide/_midstream.scss
+@forward "upstream" hide c;
+
+<===> through_forward/hide/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/hide/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use "sass:meta";
+@use "foo";
+a {@include meta.apply(meta.get-mixin($name: "foo", $module: "color"), #abcdef)}
+
+<===> named/foo.scss
+@mixin foo($color) {
+  b: red($color)
+}
+
+<===> named/output.css
+a {
+  b: 171;
+}
diff --git a/spec/core_functions/meta/get_mixin/equality.hrx b/spec/core_functions/meta/get_mixin/equality.hrx
new file mode 100644
index 0000000000..81df3a423f
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/equality.hrx
@@ -0,0 +1,74 @@
+<===> same_value/input.scss
+@use "sass:meta";
+@mixin foo() {}
+$a: meta.get-mixin(foo);
+a {b: $a == $a}
+
+<===> same_value/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/same/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(load-css, meta)}
+
+<===> built_in/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/different/input.scss
+@use "sass:meta";
+@mixin foo() {}
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(foo)}
+
+<===> built_in/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/same/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+a {b: meta.get-mixin(user-defined) == meta.get-mixin(user-defined)}
+
+<===> user_defined/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> user_defined/different/input.scss
+@use "sass:meta";
+@mixin user-defined-1() {}
+@mixin user-defined-2() {}
+a {b: meta.get-mixin(user-defined-1) == meta.get-mixin(user-defined-2)}
+
+<===> user_defined/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/redefined/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+$first-reference: meta.get-mixin(user-defined);
+
+@mixin user-defined() {}
+$second-reference: meta.get-mixin(user-defined);
+a {b: $first-reference == $second-reference}
+
+<===> user_defined/redefined/output.css
+a {
+  b: false;
+}
diff --git a/spec/core_functions/meta/get_mixin/error.hrx b/spec/core_functions/meta/get_mixin/error.hrx
new file mode 100644
index 0000000000..dd64231067
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/error.hrx
@@ -0,0 +1,262 @@
+<===> argument/type/name/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(2px)}
+
+<===> argument/type/name/error
+Error: $name: 2px is not a string.
+  ,
+1 | a {b: meta.get-mixin(2px)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/type/module/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(c, $module: 1)}
+
+<===> argument/type/module/error
+Error: $module: 1 is not a string.
+  ,
+1 | a {b: meta.get-mixin(c, $module: 1)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/mixin_ref/input.scss
+@use "sass:meta";
+@mixin foo() {}
+
+$foo-ref: meta.get-mixin(foo);
+a {b: meta.get-mixin($foo-ref)}
+
+<===> argument/mixin_ref/error
+Error: $name: get-mixin("foo") is not a string.
+  ,
+6 | a {b: meta.get-mixin($foo-ref)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 6:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/too_few/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin()}
+
+<===> argument/too_few/error
+Error: Missing argument $name.
+  ,--> input.scss
+1 | a {b: meta.get-mixin()}
+  |       ^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function get-mixin($name, $module: null) {
+  |           ================================== declaration
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/too_many/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(c, true, d, e)}
+
+<===> argument/too_many/error
+Error: Only 3 arguments allowed, but 4 were passed.
+  ,--> input.scss
+1 | a {b: meta.get-mixin(c, true, d, e)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function get-mixin($name, $module: null) {
+  |           ================================== declaration
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> non_existent/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(does-not-exist)}
+
+<===> non_existent/error
+Error: Mixin not found: does-not-exist
+  ,
+1 | a {b: meta.get-mixin(does-not-exist)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {
+  @include meta.apply(meta.get-mixin(d));
+}
+
+<===> through_forward/show/_midstream.scss
+@forward "upstream" show c;
+
+<===> through_forward/show/_upstream.scss
+@mixin d() {a: c}
+
+<===> through_forward/show/error
+Error: Mixin not found: d
+  ,
+3 |   meta.apply(meta.get-mixin(d));
+  |              ^^^^^^^^^^^^^^^
+  '
+  input.scss 3:11  root stylesheet
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {
+  @include meta.apply(meta.get-mixin(c));
+}
+
+<===> through_forward/hide/_midstream.scss
+@forward "upstream" hide c;
+
+<===> through_forward/hide/_upstream.scss
+@mixin c() {a: c}
+
+<===> through_forward/hide/error
+Error: Mixin not found: c
+  ,
+3 |   meta.apply(meta.get-mixin(c));
+  |              ^^^^^^^^^^^^^^^
+  '
+  input.scss 3:11  root stylesheet
+
+<===>
+================================================================================
+<===> division/input.scss
+@use "sass:meta";
+@mixin foo() {}
+@mixin bar() {}
+a {b: meta.get-mixin(foo) / meta.get-mixin(bar)}
+
+<===> division/error
+Error: meta.get-mixin("foo") isn't a valid CSS value.
+  ,
+1 | a {b: meta.get-mixin(foo) / meta.get-mixin(bar)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> mixin_exists/input.scss
+@use "sass:meta";
+@mixin add-two($v) {
+  a: $v + 2;
+}
+
+$add-two-mixin: meta.get-mixin(add-two);
+
+.error {
+  error: meta.get-mixin($add-two-mixin);
+}
+
+<===> mixin_exists/error
+Error: $name: meta.get-mixin("add-two") is not a string.
+  ,
+8 |   error: meta.get-mixin($add-two-mixin);
+  |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 8:10  root stylesheet
+
+<===>
+================================================================================
+<===> conflict/input.scss
+@use "sass:meta";
+@use "other1" as *;
+@use "other2" as *;
+
+a {b: meta.get-mixin(member)}
+
+<===> conflict/other1.scss
+@mixin member() {a: other1}
+
+<===> conflict/other2.scss
+@mixin member() {a: other2}
+
+<===> conflict/error
+Error: This mixin is available from multiple global modules.
+    ,
+1   | @use "other1" as *;
+    | ================== includes mixin
+2   | @use "other2" as *;
+    | ================== includes mixin
+... |
+4   | a {b: meta.get-mixin(member)}
+    |       ^^^^^^^^^^^^^^^^^^^^ mixin use
+    '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/undefined/input.scss
+@use "sass:meta";
+@use "sass:color";
+a {b: meta.get-mixin("c", $module: "color")}
+
+<===> module/undefined/error
+Error: Mixin not found: "c"
+  ,
+2 | a {b: meta.get-mixin("c", $module: "color")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/non_existent/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin("c", $module: "d")}
+
+<===> module/non_existent/error
+Error: There is no module with the namespace "d".
+  ,
+1 | a {b: meta.get-mixin("c", $module: "d")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/built_in_but_not_loaded/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin("red", $module: "color")}
+
+<===> module/built_in_but_not_loaded/error
+Error: There is no module with the namespace "color".
+  ,
+1 | a {b: meta.get-mixin("red", $module: "color")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/dash_sensitive/input.scss
+@use "sass:meta";
+@use "sass:color" as a-b;
+c {d: meta.get-mixin("c", $module: "a_b")}
+
+<===> module/dash_sensitive/error
+Error: There is no module with the namespace "a_b".
+  ,
+2 | c {d: meta.get-mixin("c", $module: "a_b")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
diff --git a/spec/core_functions/meta/get_mixin/meta.hrx b/spec/core_functions/meta/get_mixin/meta.hrx
new file mode 100644
index 0000000000..dc99b316bf
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/meta.hrx
@@ -0,0 +1,21 @@
+<===> inspect/input.scss
+@use "sass:meta";
+@mixin foo() {}
+a {b: inspect(meta.get-mixin(foo))};
+
+<===> inspect/output.css
+a {
+  b: get-mixin("foo");
+}
+
+<===>
+================================================================================
+<===> type_of/input.scss
+@use "sass:meta";
+@mixin foo() {}
+a {b: type-of(meta.get-mixin(foo))};
+
+<===> type_of/output.css
+a {
+  b: mixin;
+}
diff --git a/spec/core_functions/meta/get_mixin/same_module.hrx b/spec/core_functions/meta/get_mixin/same_module.hrx
new file mode 100644
index 0000000000..288396a841
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/same_module.hrx
@@ -0,0 +1,71 @@
+<===> user_defined/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+$add-two-mixin: meta.get-mixin(add-two);
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> user_defined/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> redefined/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+$add-two-mixin: meta.get-mixin(add-two);
+
+// The mixin returned by `meta.get-mixin()` is locked in place when it's
+// called. Redefining the mixin after the fact shouldn't affect the stored
+// value.
+@mixin add-two($v) {@error "Should not be called"}
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> redefined/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> through_import/input.scss
+@use "sass:meta";
+@import "other";
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> through_import/other.scss
+@mixin add-two($v) {b: $v + 2}
+
+<===> through_import/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> dash_insensitive/dash_to_underscore/input.scss
+@use "sass:meta";
+@mixin add_two($v) {b: $v + 2}
+
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> dash_insensitive/dash_to_underscore/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> dash_insensitive/underscore_to_dash/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+
+a {@include meta.apply(meta.get-mixin(add_two), 10)}
+
+<===> dash_insensitive/underscore_to_dash/output.css
+a {
+  b: 12;
+}
diff --git a/spec/core_functions/meta/get_mixin/scope.hrx b/spec/core_functions/meta/get_mixin/scope.hrx
new file mode 100644
index 0000000000..cee735e4b9
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/scope.hrx
@@ -0,0 +1,47 @@
+<===> stores_local_scope/options.yml
+---
+:todo:
+- sass/libsass#2830
+
+<===> stores_local_scope/input.scss
+@use "sass:meta";
+$add-two-mixin: null;
+
+.scope {
+  @mixin add-two($v) {b: $v + 2}
+
+  // This mixin reference will still refer to this nested `add-two` mixin
+  // even when it goes out of scope.
+  $add-two-mixin: get-mixin(add-two) !global;
+}
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> stores_local_scope/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> captures_inner_scope/input.scss
+@use "sass:meta";
+@mixin add-two($v) {@error "Should not be called"}
+.scope1 {
+  @mixin add-two($v) {@error "Should not be called"}
+  .scope2 {
+    @mixin add-two($v) {@error "Should not be called"}
+    .scope3 {
+      @mixin add-two($v) {a: $v + 2}
+
+      // Like a normal mixin call, get-mixin() will always use the
+      // innermost definition of a mixin.
+      @include meta.apply(get-mixin(add-two), 10);
+    }
+  }
+}
+
+<===> captures_inner_scope/output.css
+.scope1 .scope2 .scope3 {
+  a: 12;
+}
diff --git a/spec/core_functions/meta/module_mixins.hrx b/spec/core_functions/meta/module_mixins.hrx
new file mode 100644
index 0000000000..6000b56487
--- /dev/null
+++ b/spec/core_functions/meta/module_mixins.hrx
@@ -0,0 +1,372 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===> _util.scss
+@use "sass:meta";
+
+@mixin print-mixin-map($mixins) {
+  a {
+    @each $name, $mixin in $mixins {
+      #{$name}: {@include meta.apply($mixin)};
+    }
+  }
+}
+
+<===>
+================================================================================
+<===> empty/input.scss
+@use "sass:meta";
+@use "other";
+
+a {b: meta.inspect(meta.module-mixins("other"))}
+
+<===> empty/_other.scss
+// This module defines no mixins.
+
+<===> empty/output.css
+a {
+  b: ();
+}
+
+<===>
+================================================================================
+<===> multiple/input.scss
+@use "sass:meta";
+@use "../util";
+@use "other";
+
+@include util.print-mixin-map(meta.module-mixins("other"));
+
+<===> multiple/_other.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> multiple/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> dash_sensitive/input.scss
+@use "sass:meta";
+@use "../util";
+@use "other";
+
+@include util.print-mixin-map(meta.module-mixins("other"));
+
+<===> dash_sensitive/_other.scss
+@mixin b-c() {b-c: value}
+@mixin d_e() {d_e: value}
+
+<===> dash_sensitive/output.css
+a {
+  b-c-b-c value;
+  d-e-d_e value;
+}
+
+<===>
+================================================================================
+<===> as/input.scss
+@use "sass:meta";
+@use "../util";
+@use "other" as b;
+
+@include util.print-mixin-map(meta.module-mixins("b"))
+
+<===> as/_other.scss
+@mixin c() {c: value}
+@mixin d() {d: value}
+@mixin e() {e: value}
+
+<===> as/output.css
+a {
+  c-c: value;
+  d-d: value;
+  e-e: value;
+}
+
+<===>
+================================================================================
+<===> through_import/input.scss
+@use "sass:meta";
+@use "../util";
+@use "used";
+
+@include util.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_import/_used.scss
+@import "imported";
+
+<===> through_import/_imported.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_import/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> core_module/input.scss
+@use "sass:map";
+@use "sass:meta";
+
+// We don't want to print every mixin name in this module, since that would
+// make this test brittle when new mixins are added. Instead we just test
+// that a couple mixins work.
+
+$mixins: meta.module-mixins("meta");
+a {
+  load-css-exists: map.has-key($mixins, "load-css");
+}
+
+<===> core_module/output.css
+a {
+  load-css-exists: true;
+}
+
+<===>
+================================================================================
+<===> through_forward/bare/input.scss
+@use "sass:meta";
+@use "../../util";
+@use "used";
+
+@include util.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/bare/_used.scss
+@forward "forwarded";
+
+<===> through_forward/bare/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/bare/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/as/input.scss
+@use "sass:meta";
+@use "../../util";
+@use "used";
+
+@include util.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/as/_used.scss
+@forward "forwarded" as b-*;
+
+<===> through_forward/as/_forwarded.scss
+@mixin c() {c: value}
+@mixin d() {d: value}
+@mixin e() {e: value}
+
+<===> through_forward/as/output.css
+a {
+  b-c-c: value;
+  b-d-d: value;
+  b-e-e: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "../../util";
+@use "used";
+
+@include util.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/show/_used.scss
+@forward "forwarded" show b, c;
+
+<===> through_forward/show/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/show/output.css
+a {
+  b-b: value;
+  c-c: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "../../util";
+@use "used";
+
+@include util.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/hide/_used.scss
+@forward "forwarded" hide b, c;
+
+<===> through_forward/hide/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/hide/output.css
+a {
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use "sass:meta";
+@use "../util";
+@use "other";
+
+@include util.print-mixin-map(meta.module-mixins($module: "other"));
+
+<===> named/_other.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> named/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> error/type/input.scss
+@use "sass:meta";
+$a: meta.module-mixins(1);
+
+<===> error/type/error
+Error: $module: 1 is not a string.
+  ,
+2 | $a: meta.module-mixins(1);
+  |     ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+@use "sass:meta";
+$a: meta.module-mixins();
+
+<===> error/too_few_args/error
+Error: Missing argument $module.
+  ,--> input.scss
+2 | $a: meta.module-mixins();
+  |     ^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @mixin module-mixins($module) {
+  |        ========================= declaration
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+@use "sass:meta";
+$a: meta.module-mixins("meta", "c");
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,--> input.scss
+2 | $a: meta.module-mixins("meta", "c");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @mixin module-mixins($module) {
+  |        ========================= declaration
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/missing/input.scss
+@use "sass:meta";
+$a: meta.module-mixins("other");
+
+<===> error/missing/error
+Error: There is no module with namespace "other".
+  ,
+2 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/dash_sensitive/input.scss
+@use "sass:meta";
+@use "other-module";
+
+$a: meta.module-mixins("other_module");
+
+<===> error/dash_sensitive/_other-module.scss
+// This module defines no mixins.
+
+<===> error/dash_sensitive/error
+Error: There is no module with namespace "other_module".
+  ,
+4 | $a: meta.module-mixins("other_module");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/global/input.scss
+@use "sass:meta";
+@use "other" as *;
+
+$a: meta.module-mixins("other");
+
+<===> error/global/_other.scss
+// This module defines no mixins.
+
+<===> error/global/error
+Error: There is no module with namespace "other".
+  ,
+4 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/before_load/input.scss
+@use "sass:meta";
+
+$a: meta.module-mixins("other");
+
+@use "other";
+
+<===> error/before_load/_other.scss
+// This module defines no mixins.
+
+<===> error/before_load/error
+Error: There is no module with namespace "other".
+  ,
+3 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:5  root stylesheet
diff --git a/spec/core_functions/meta/type_of.hrx b/spec/core_functions/meta/type_of.hrx
index 45b5379a64..692ff64489 100644
--- a/spec/core_functions/meta/type_of.hrx
+++ b/spec/core_functions/meta/type_of.hrx
@@ -177,6 +177,18 @@ a {
   b: calculation;
 }
 
+<===>
+================================================================================
+<===> mixin/input.scss
+@use "sass:meta";
+@mixin foo() {}
+a {b: type-of(meta.get-mixin(foo))}
+
+<===> mixin/output.css
+a {
+  b: mixin;
+}
+
 <===>
 ================================================================================
 <===> named/input.scss