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fix(@schematics/angular): update the PostCSS configuration used by the build in tailwind #34571

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fix(@schematics/angular): update the PostCSS configuration used by the build in tailwind #34571

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fix(@schematics/angular): update the PostCSS configuration used by th…
MeAkib Oct 28, 2026
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fixup! fix(@schematics/angular): update the PostCSS configuration use…
MeAkib Oct 28, 2026
46e0547
fixup! fix(@schematics/angular): update the PostCSS configuration use…
MeAkib Oct 28, 2026
70843cb
fixup! fix(@schematics/angular): update the PostCSS configuration use…
MeAkib Oct 28, 2026
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fixup! fix(@schematics/angular): update the PostCSS configuration use…
MeAkib Oct 28, 2026
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5 changes: 3 additions & 2 deletions packages/schematics/angular/tailwind/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,8 @@ import { createProjectSchematic } from '../utility/project';
import { Schema as TailwindOptions } from './schema';

const TAILWIND_DEPENDENCIES = ['tailwindcss', '@tailwindcss/postcss', 'postcss'];
const POSTCSS_CONFIG_FILES = ['.postcssrc.json', 'postcss.config.json'];
// Same lookup order as the build system, so the configuration that gets updated is the one used.
const POSTCSS_CONFIG_FILES = ['postcss.config.json', '.postcssrc.json'];

function addTailwindStyles(options: { project: string }, project: ProjectDefinition): Rule {
return async (tree) => {
Expand Down Expand Up @@ -94,7 +95,7 @@ function addTailwindStyles(options: { project: string }, project: ProjectDefinit

function managePostCssConfiguration(project: ProjectDefinition): Rule {
return async (tree) => {
const searchPaths = ['/', project.root]; // Workspace root and project root
const searchPaths = new Set([join('/', project.root), '/']);

for (const path of searchPaths) {
for (const configFile of POSTCSS_CONFIG_FILES) {
Expand Down
22 changes: 22 additions & 0 deletions packages/schematics/angular/tailwind/index_spec.ts
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Expand Up @@ -128,6 +128,28 @@ describe('Tailwind Schematic', () => {
expect(postCssConfig.plugins['autoprefixer']).toBeDefined();
expect(tree.exists('/projects/bar/.postcssrc.json')).toBe(false);
});

it('should prefer a project root configuration over a workspace root configuration', async () => {
appTree.create('/.postcssrc.json', JSON.stringify({ plugins: {} }));
appTree.create('/projects/bar/postcss.config.json', JSON.stringify({ plugins: {} }));
const tree = await schematicRunner.runSchematic('tailwind', { project: 'bar' }, appTree);

const projectConfig = JSON.parse(tree.readContent('/projects/bar/postcss.config.json'));
expect(projectConfig.plugins['@tailwindcss/postcss']).toBeDefined();
const workspaceConfig = JSON.parse(tree.readContent('/.postcssrc.json'));
expect(workspaceConfig.plugins['@tailwindcss/postcss']).toBeUndefined();
});

it('should prefer postcss.config.json over .postcssrc.json in the same directory', async () => {
appTree.create('/projects/bar/.postcssrc.json', JSON.stringify({ plugins: {} }));
appTree.create('/projects/bar/postcss.config.json', JSON.stringify({ plugins: {} }));
const tree = await schematicRunner.runSchematic('tailwind', { project: 'bar' }, appTree);

const config = JSON.parse(tree.readContent('/projects/bar/postcss.config.json'));
expect(config.plugins['@tailwindcss/postcss']).toBeDefined();
const rcConfig = JSON.parse(tree.readContent('/projects/bar/.postcssrc.json'));
expect(rcConfig.plugins['@tailwindcss/postcss']).toBeUndefined();
});
});

describe('with non-workspace stylesheets', () => {
Expand Down
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