[system] Add spacing theme token to be used in theme.spacing()

packages/mui-joy/src/Typography/Typography.test.tsx

@@ -98,7 +98,10 @@ describe('<Typography />', () => {
     });
   });
 
-  it('combines system properties with the sx prop', () => {
+  it('combines system properties with the sx prop', function test() {
+    if (/jsdom/.test(window.navigator.userAgent)) {
+      this.skip();
+    }
     const { container } = render(<Typography mt={2} mr={1} sx={{ marginRight: 5, mb: 2 }} />);
 
     expect(container.firstChild).toHaveComputedStyle({

packages/mui-joy/src/styles/CssVarsProvider.test.tsx

@@ -526,7 +526,7 @@ describe('[Joy] CssVarsProvider', () => {
         </CssVarsProvider>,
       );
 
-      expect(container.firstChild?.textContent).to.equal('16px');
+      expect(container.firstChild?.textContent).to.equal('calc(2 * var(--joy-spacing))');
     });
   });
 

packages/mui-joy/src/styles/defaultTheme.test.js

@@ -36,6 +36,7 @@ describe('defaultTheme', () => {
         'shouldSkipGeneratingVar',
         'generateStyleSheets',
         'generateThemeVars',
+        'generateSpacing',
         'applyStyles',
       ]).to.includes(field);
     });

packages/mui-joy/src/styles/extendTheme.test.js

@@ -38,6 +38,7 @@ describe('extendTheme', () => {
         'shouldSkipGeneratingVar',
         'generateStyleSheets',
         'generateThemeVars',
+        'generateSpacing',
         'applyStyles',
       ]).to.includes(field);
     });
@@ -106,6 +107,51 @@ describe('extendTheme', () => {
     });
   });
 
+  describe('spacing', () => {
+    it('produce spacing token by default', () => {
+      const theme = extendTheme();
+      expect(theme.vars.spacing).to.equal('var(--joy-spacing, 8px)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--joy-spacing, 8px))');
+    });
+
+    it('turn number to pixel', () => {
+      const theme = extendTheme({ spacing: 4 });
+      expect(theme.vars.spacing).to.equal('var(--joy-spacing, 4px)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--joy-spacing, 4px))');
+    });
+
+    it('can be customized as a string', () => {
+      const theme = extendTheme({ spacing: '0.5rem' });
+      expect(theme.vars.spacing).to.equal('var(--joy-spacing, 0.5rem)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--joy-spacing, 0.5rem))');
+    });
+
+    it('uses the provided value if it is a string', () => {
+      const theme = extendTheme({ spacing: '0.5rem' });
+      expect(theme.spacing('1rem')).to.equal('1rem');
+    });
+
+    it('can be customized as an array', () => {
+      const theme = extendTheme({ spacing: [0, 1, 2, 4, 8, 16, 32] });
+      expect(theme.vars.spacing).to.deep.equal([
+        'var(--joy-spacing-0, 0px)',
+        'var(--joy-spacing-1, 1px)',
+        'var(--joy-spacing-2, 2px)',
+        'var(--joy-spacing-3, 4px)',
+        'var(--joy-spacing-4, 8px)',
+        'var(--joy-spacing-5, 16px)',
+        'var(--joy-spacing-6, 32px)',
+      ]);
+      expect(theme.spacing(2)).to.equal('var(--joy-spacing-2, 2px)');
+    });
+
+    it('can be customized as a function', () => {
+      const theme = extendTheme({ spacing: (factor) => `${0.25 * factor}rem` });
+      expect(theme.vars.spacing).to.deep.equal('var(--joy-spacing, 0.25rem)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--joy-spacing, 0.25rem))');
+    });
+  });
+
   describe('theme.unstable_sx', () => {
     const { render } = createRenderer();
 

packages/mui-joy/src/styles/extendTheme.ts

@@ -11,6 +11,7 @@ import {
   SxConfig,
 } from '@mui/system';
 import { unstable_applyStyles as applyStyles } from '@mui/system/createTheme';
+import { createUnarySpacing } from '@mui/system/spacing';
 import defaultSxConfig from './sxConfig';
 import colors from '../colors';
 import defaultShouldSkipGeneratingVar from './shouldSkipGeneratingVar';
@@ -43,6 +44,22 @@ type Partial3Level<T> = {
   };
 };
 
+function getSpacingVal(spacingInput: SpacingOptions | string | undefined) {
+  if (typeof spacingInput === 'number') {
+    return `${spacingInput}px`;
+  }
+  if (typeof spacingInput === 'string') {
+    return spacingInput;
+  }
+  if (typeof spacingInput === 'function') {
+    return getSpacingVal(spacingInput(1));
+  }
+  if (Array.isArray(spacingInput)) {
+    return spacingInput;
+  }
+  return '8px';
+}
+
 export type ColorSystemOptions = Partial3Level<
   MergeDefault<ColorSystem, { palette: PaletteOptions }>
 > & {
@@ -586,7 +603,7 @@ export default function extendTheme(themeOptions?: CssVarsThemeOptions): Theme {
     ),
     cssVarPrefix,
     getCssVar,
-    spacing: createSpacing(spacing),
+    spacing: getSpacingVal(spacing),
   } as unknown as Theme & { attribute: string; colorSchemeSelector: string }; // Need type casting due to module augmentation inside the repo
 
   /**
@@ -646,15 +663,18 @@ export default function extendTheme(themeOptions?: CssVarsThemeOptions): Theme {
   };
 
   const { vars, generateThemeVars, generateStyleSheets } = prepareCssVars<Theme, ThemeVars>(
-    // @ts-ignore property truDark is missing from colorSchemes
-    { colorSchemes, ...mergedScales },
+    theme,
     parserConfig,
   );
   theme.attribute = 'data-joy-color-scheme';
   theme.colorSchemeSelector = ':root';
   theme.vars = vars;
   theme.generateThemeVars = generateThemeVars;
   theme.generateStyleSheets = generateStyleSheets;
+  theme.generateSpacing = function generateSpacing() {
+    return createSpacing(spacing, createUnarySpacing(this));
+  };
+  theme.spacing = theme.generateSpacing();
   theme.unstable_sxConfig = {
     ...defaultSxConfig,
     ...themeOptions?.unstable_sxConfig,

packages/mui-joy/src/styles/styleUtils.test.js

@@ -58,13 +58,13 @@ describe('getThemeValue', () => {
     it('return correct value if shorthand is provided', () => {
       expect(
         resolveSxValue({ theme: defaultTheme, ownerState: { sx: { p: 2 } } }, ['p']),
-      ).to.deep.equal({ p: '16px' }); // default theme.spacing(2) = '16px'
+      ).to.deep.equal({ p: 'calc(2 * var(--joy-spacing, 8px))' });
     });
 
     it('return correct value if number is provided', () => {
       expect(
         resolveSxValue({ theme: defaultTheme, ownerState: { sx: { padding: 2 } } }, ['padding']),
-      ).to.deep.equal({ padding: '16px' });
+      ).to.deep.equal({ padding: 'calc(2 * var(--joy-spacing, 8px))' });
     });
 
     it('return correct value if css value is provided', () => {

packages/mui-joy/src/styles/types/theme.ts

@@ -109,6 +109,7 @@ export interface Theme extends ThemeScales, RuntimeColorSystem {
   getColorSchemeSelector: (colorScheme: DefaultColorScheme | ExtendedColorScheme) => string;
   generateThemeVars: () => ThemeVars;
   generateStyleSheets: () => Record<string, any>[];
+  generateSpacing: () => Spacing;
   /**
    * A function to determine if the key, value should be attached as CSS Variable
    * `keys` is an array that represents the object path keys.

packages/mui-material/src/Grid/Grid.js

@@ -27,6 +27,9 @@ import gridClasses, { getGridUtilityClass } from './gridClasses';
 
 function getOffset(val) {
   const parse = parseFloat(val);
+  if (Number.isNaN(parse)) {
+    return val;
+  }
   return `${parse}${String(val).replace(String(parse), '') || 'px'}`;
 }
 

packages/mui-material/src/styles/CssVarsProvider.test.js

@@ -267,7 +267,7 @@ describe('[Material UI] CssVarsProvider', () => {
         </CssVarsProvider>,
       );
 
-      expect(container.firstChild?.textContent).to.equal('16px');
+      expect(container.firstChild?.textContent).to.equal('calc(2 * var(--mui-spacing))');
     });
   });
 

packages/mui-material/src/styles/experimental_extendTheme.d.ts

@@ -334,6 +334,7 @@ export interface ThemeVars {
   overlays: Overlays;
   shadows: Shadows;
   shape: Theme['shape'];
+  spacing: string;
   zIndex: ZIndex;
 }
 
@@ -431,6 +432,7 @@ export interface CssVarsTheme extends ColorSystem {
   getColorSchemeSelector: (colorScheme: SupportedColorScheme) => string;
   generateThemeVars: () => ThemeVars;
   generateStyleSheets: () => Array<Record<string, any>>;
+  generateSpacing: () => Theme['spacing'];
 
   // Default theme tokens
   spacing: Theme['spacing'];

packages/mui-material/src/styles/experimental_extendTheme.js

@@ -1,8 +1,7 @@
 import deepmerge from '@mui/utils/deepmerge';
-import {
-  unstable_createGetCssVar as systemCreateGetCssVar,
-  unstable_prepareCssVars as prepareCssVars,
-} from '@mui/system';
+import { unstable_createGetCssVar as systemCreateGetCssVar, createSpacing } from '@mui/system';
+import { createUnarySpacing } from '@mui/system/spacing';
+import { prepareCssVars } from '@mui/system/cssVars';
 import styleFunctionSx, {
   unstable_defaultSxConfig as defaultSxConfig,
 } from '@mui/system/styleFunctionSx';
@@ -63,6 +62,22 @@ function setColorChannel(obj, key) {
   }
 }
 
+function getSpacingVal(spacingInput) {
+  if (typeof spacingInput === 'number') {
+    return `${spacingInput}px`;
+  }
+  if (typeof spacingInput === 'string') {
+    return spacingInput;
+  }
+  if (typeof spacingInput === 'function') {
+    return getSpacingVal(spacingInput(1));
+  }
+  if (Array.isArray(spacingInput)) {
+    return spacingInput;
+  }
+  return '8px';
+}
+
 const silent = (fn) => {
   try {
     return fn();
@@ -124,6 +139,7 @@ export default function extendTheme(options = {}, ...args) {
         overlays: colorSchemesInput.dark?.overlays || defaultDarkOverlays,
       },
     },
+    spacing: getSpacingVal(input.spacing),
   };
 
   Object.keys(theme.colorSchemes).forEach((key) => {
@@ -414,7 +430,11 @@ export default function extendTheme(options = {}, ...args) {
   });
   theme.generateThemeVars = generateThemeVars;
   theme.generateStyleSheets = generateStyleSheets;
+  theme.generateSpacing = function generateSpacing() {
+    return createSpacing(input.spacing, createUnarySpacing(this));
+  };
   theme.getColorSchemeSelector = (colorScheme) => `[${theme.attribute}="${colorScheme}"] &`;
+  theme.spacing = theme.generateSpacing();
   theme.shouldSkipGeneratingVar = shouldSkipGeneratingVar;
   theme.unstable_sxConfig = {
     ...defaultSxConfig,

packages/mui-material/src/styles/experimental_extendTheme.test.js

@@ -363,6 +363,51 @@ describe('experimental_extendTheme', () => {
     });
   });
 
+  describe('spacing', () => {
+    it('produce spacing token by default', () => {
+      const theme = extendTheme();
+      expect(theme.vars.spacing).to.equal('var(--mui-spacing, 8px)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--mui-spacing, 8px))');
+    });
+
+    it('turn number to pixel', () => {
+      const theme = extendTheme({ spacing: 4 });
+      expect(theme.vars.spacing).to.equal('var(--mui-spacing, 4px)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--mui-spacing, 4px))');
+    });
+
+    it('can be customized as a string', () => {
+      const theme = extendTheme({ spacing: '0.5rem' });
+      expect(theme.vars.spacing).to.equal('var(--mui-spacing, 0.5rem)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--mui-spacing, 0.5rem))');
+    });
+
+    it('uses the provided value if it is a string', () => {
+      const theme = extendTheme({ spacing: '0.5rem' });
+      expect(theme.spacing('1rem')).to.equal('1rem');
+    });
+
+    it('can be customized as an array', () => {
+      const theme = extendTheme({ spacing: [0, 1, 2, 4, 8, 16, 32] });
+      expect(theme.vars.spacing).to.deep.equal([
+        'var(--mui-spacing-0, 0px)',
+        'var(--mui-spacing-1, 1px)',
+        'var(--mui-spacing-2, 2px)',
+        'var(--mui-spacing-3, 4px)',
+        'var(--mui-spacing-4, 8px)',
+        'var(--mui-spacing-5, 16px)',
+        'var(--mui-spacing-6, 32px)',
+      ]);
+      expect(theme.spacing(2)).to.equal('var(--mui-spacing-2, 2px)');
+    });
+
+    it('can be customized as a function', () => {
+      const theme = extendTheme({ spacing: (factor) => `${0.25 * factor}rem` });
+      expect(theme.vars.spacing).to.deep.equal('var(--mui-spacing, 0.25rem)');
+      expect(theme.spacing(2)).to.equal('calc(2 * var(--mui-spacing, 0.25rem))');
+    });
+  });
+
   it('shallow merges multiple arguments', () => {
     const theme = extendTheme({ foo: 'I am foo' }, { bar: 'I am bar' });
     expect(theme.foo).to.equal('I am foo');

packages/mui-system/src/createTheme/createSpacing.test.ts

@@ -16,6 +16,8 @@ describe('createSpacing', () => {
     expect(spacing(2)).to.equal('4px');
     spacing = createSpacing((factor: number) => `${0.25 * factor}rem`);
     expect(spacing(2)).to.equal('0.5rem');
+    spacing = createSpacing('0.5rem');
+    expect(spacing(2)).to.equal('calc(2 * 0.5rem)');
   });
 
   it('should support recursion', () => {

packages/mui-system/src/createTheme/createSpacing.ts

@@ -2,6 +2,7 @@ import { createUnarySpacing } from '../spacing';
 
 export type SpacingOptions =
   | number
+  | string
   | Spacing
   | ((abs: number) => number | string)
   | ((abs: number | string) => number | string)
@@ -24,18 +25,19 @@ export interface Spacing {
   ): string;
 }
 
-export default function createSpacing(spacingInput: SpacingOptions = 8): Spacing {
-  // Already transformed.
-  if ((spacingInput as any).mui) {
-    return spacingInput as Spacing;
-  }
-
+export default function createSpacing(
+  spacingInput: SpacingOptions = 8,
   // Material Design layouts are visually balanced. Most measurements align to an 8dp grid, which aligns both spacing and the overall layout.
   // Smaller components, such as icons, can align to a 4dp grid.
   // https://m2.material.io/design/layout/understanding-layout.html
-  const transform = createUnarySpacing({
+  transform = createUnarySpacing({
     spacing: spacingInput,
-  });
+  }),
+): Spacing {
+  // Already transformed.
+  if ((spacingInput as any).mui) {
+    return spacingInput as Spacing;
+  }
 
   const spacing = (...argsInput: ReadonlyArray<number | string>): string => {
     if (process.env.NODE_ENV !== 'production') {

packages/mui-system/src/cssVars/createCssVarsProvider.js

@@ -153,6 +153,9 @@ export default function createCssVarsProvider(options) {
       cssVarPrefix,
       vars: themeVars,
     };
+    if (typeof theme.generateSpacing === 'function') {
+      theme.spacing = theme.generateSpacing();
+    }
 
     // 4. Resolve the color scheme and merge it to the theme
     Object.entries(colorSchemes).forEach(([key, scheme]) => {

packages/mui-system/src/cssVars/cssVarsParser.test.ts

@@ -359,6 +359,21 @@ describe('cssVarsParser', () => {
       });
     });
 
+    it('varsWithDefaults are suffixed with px from array', () => {
+      const { varsWithDefaults } = cssVarsParser({
+        spacing: [0, 1, 2, 6, 16],
+      });
+      expect(varsWithDefaults).to.deep.equal({
+        spacing: [
+          'var(--spacing-0, 0px)',
+          'var(--spacing-1, 1px)',
+          'var(--spacing-2, 2px)',
+          'var(--spacing-3, 6px)',
+          'var(--spacing-4, 16px)',
+        ],
+      });
+    });
+
     it('should add a fallback value', () => {
       const { varsWithDefaults } = cssVarsParser({
         palette: {