wip: move design tokens to config, and add css-utils

src/css-utils/colors.js

@@ -0,0 +1,35 @@
+const colorSchemes = require("../../config/design-tokens/colors.json");
+const { helperClassesToCss } = require("./helperClasses");
+
+const lightScheme = colorSchemes.light;
+const darkScheme = colorSchemes.dark;
+
+const colorToCss = (key, value) =>
+  `--${key}: ${value}; --color-${key}: hsl(${value});`;
+
+const colorSchemeToCss = (scheme) =>
+  Object.entries(scheme).reduce(
+    (css, [key, value]) => css + colorToCss(key, value),
+    ``,
+  );
+
+const lightCss = colorSchemeToCss(lightScheme);
+const darkCss = colorSchemeToCss(darkScheme);
+
+const colorSchemeToHelperClassesCss = (scheme, helperClasses) => {
+  return Object.entries(scheme).reduce((css, [key]) => {
+    return css + helperClassesToCss(helperClasses, key, `var(--color-${key})`);
+  }, ``);
+};
+
+const helperClasses = [
+  ["text", ["color"]],
+  ["bg", ["background-color"]],
+];
+
+const helperClassesCss = colorSchemeToHelperClassesCss(
+  lightScheme,
+  helperClasses,
+);
+
+module.exports = `:root{${lightCss}}${helperClassesCss}@media (prefers-color-scheme: dark) {:root{${darkCss}}}`;

src/css-utils/helperClasses.js

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+/**
+ * Given an array of CSS properties, output css properties
+ * with each property equal to `value`
+ */
+const cssPropertiesToCss = (cssProperties, value) => {
+  return cssProperties.reduce((css, cssProp) => {
+    return css + `${cssProp}:${value};`;
+  }, ``);
+};
+
+/**
+ * Given a helperClass (string) and array of cssProperties,
+ * will generate a css class named helperClass that has
+ * all cssProperties mapped to value.
+ */
+const helperClassToCss = (helperClass, cssProperties, value) => {
+  const cssProps = cssPropertiesToCss(cssProperties, value);
+  return `.${helperClass}{${cssProps}}`;
+};
+
+/**
+ * Given an array of helperClasses that map to cssProperties,
+ * output a string of CSS that maps the helperClass (with variant modifier)
+ * to the array of css properties with each css property equal to
+ * value
+ *
+ * e.g.
+ * helperClasses = [["text", ["color"]]],
+ * variant = "primary",
+ * value = "#000"
+ *
+ * Will output the following:
+ * .text-primary {
+ *    color: #000;
+ * }
+ */
+const helperClassesToCss = (helperClasses, variant, value) => {
+  return helperClasses.reduce((css, [helperClass, cssProperties]) => {
+    return (
+      css + helperClassToCss(`${helperClass}-${variant}`, cssProperties, value)
+    );
+  }, ``);
+};
+
+module.exports = { cssPropertiesToCss, helperClassToCss, helperClassesToCss };