如何使用 scss 中的合适函数将 scss 变量存储到 css 变量？

Question

I have constants.scss file with many variables:

// TYPOGRAPHY
$main-font: "Rubik", monospace, "Roboto","Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;
$number-font: "Montserrat", Helvetica, Arial, serif, "Roboto Mono", monospace;

// Z-LAYER
$layer-1: 1;
$layer-2: 2;
$layer-3: 3;
$layer-4: 4;
$layer-5: 5;

// COLOR PALETTE
$cyan: #39d0ff;
$powderblue: #bae0ff;
$lightblue: #7fc9ff;
$blue: #1976D2;
$warmblue: #7491ff;
$coldblue: #8ccade;
$darkblue: #1669bb;
$accentblue: #1E88E5;
$brightred: #DD0031;
$darkred: #C3002F;
$white: #FFFFFF;
$offwhite: #FAFAFA;
$tangerine: #DDA302;
$darkgoldenrod: #C3A300;
$backgroundgray: #F1F1F1;
$superlightgray: #F2F2F2;
$lightgray: #DBDBDB;
$lightboxgray: #EBEBEB;
$mist: #ECEFF1;
$mediumgray: #6E6E6E;
$darkgray: #444444;
$deepgray: #333333;
$black: #0A1014;
$orange: #FF9800;
$darkorange: #940;
$anti-pattern: $brightred;

// API & CODE COLORS
$amber-200: #AA3000;
$amber-700: #FFA000;
$blue-400: #42A5F5;
$blue-500: #2196F3;
$blue-600: #1E88E5;
$blue-800: #1565C0;
$blue-900: #0D47A1;
$blue-grey-50: #ECEFF1;
$blue-grey-100: #CFD8DC;
$blue-grey-200: #B0BEC5;
$blue-grey-300: #90A4AE;
$blue-grey-400: #78909C;
$blue-grey-500: #607D8B;
$blue-grey-600: #546E7A;
$blue-grey-700: #455A64;
$blue-grey-800: #37474F;
$blue-grey-900: #263238;
$codegreen: #17ff0b;
$green-500: #4CAF50;
$green-800: #2E7D32;
$light-green-600: #7CB342;
$pink-600: #D81B60;
$purple-600: #8E24AA;
$teal-500: #009688;
$lightgrey: #F5F6F7;

// STATE COLORS
$focus-outline-ondark: rgba($white, 0.8);
$focus-outline-onlight: $accentblue;

// GRADIENTS
$bluegradient: linear-gradient(145deg,$blue-900,$blue-400);
$redgradient: linear-gradient(145deg,$darkred,$brightred);

// API LABEL COLOR AND SYMBOLS MAP
$api-symbols: (
  all: (
    content: ' ',
    background: $white
  ),
  class: (
    content: 'C',
    background: $blue-500
  ),
  const: (
    content: 'K',
    background: $mediumgray
  ),
  decorator: (
    content: '@',
    background: $blue-800
  ),
  directive: (
    content: 'D',
    background: $pink-600
  ),
  enum: (
    content: 'E',
    background: $amber-700
  ),
  function: (
    content: 'F',
    background: $green-500
  ),
  interface: (
    content: 'I',
    background: $teal-500
  ),
  let: (
    content: 'K',
    background: $mediumgray
  ),
  ngmodule: (
    content: 'M',
    background: $darkorange
  ),
  package: (
    content: 'Pk',
    background: $purple-600
  ),
  pipe: (
    content: 'P',
    background: $blue-grey-600
  ),
  element: (
    content: 'El',
    background: $amber-200
  ),
  type-alias: (
    content: 'T',
    background: $light-green-600
  ),
  var: (
    content: 'K',
    background: $mediumgray
  ),
);

I want to store this variables in css variables using @each or any suitable function of scss.

So I try to do:

@use '../../constants';

:root {

  border:1px solid constants.$cyan; // works
  @each $color, $value in constants {
     --#{$color}: #{$value}; // not works.
  }
}

I get in the html (inspect):

:root {
    border: 1px solid #39d0ff;
    --constants: ;
}

What I expected is:

:root {
    border: 1px solid #39d0ff;
    --main-font: "Rubik", monospace, "Roboto","Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;
    --number-font: "Montserrat", Helvetica, Arial, serif, "Roboto Mono", monospace;

    // Z-LAYER
    --layer-1: 1;
    --layer-2: 2;
    --layer-3: 3;
    ....
}

Maybe I don't use correctly in the function. any idea what I need to do to fix that?

Answer 1

in your sass file, 'constants' refers to the entire constants.scss file/module. @each works on lists or maps, so you could do something like this in constants.scss :

// TYPOGRAPHY
$main-font: "Rubik", monospace, "Roboto","Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;
$number-font: "Montserrat", Helvetica, Arial, serif, "Roboto Mono", monospace;

$fonts: (
  main-font: $main-font,
  number-font: $number-font,
);

and then in your other file, something like this:

@use '../../constants';

:root {

  border:1px solid constants.$cyan;
  @each $font, $value in constants.$fonts {
     --#{$font}: #{$value};
  }
}

And then something similar with colors, layers etc.