@ecopages/postcss-processor

@ecopages/postcss-processor

PostCSS processing pipeline for Ecopages. It provides a processor plugin that seamlessly integrates PostCSS into the Ecopages build system, and includes built-in presets for Tailwind CSS (v3 and v4).

Features

• Ecopages Processor Plugin: Hook right into the build pipeline.
• Tailwind Presets: Pre-configured pipelines for Tailwind CSS v3 and v4.
• Automatic Configuration: Detects existing postcss.config.{js,ts,etc}.
• Bun Loader: Registers a Bun loader for importing CSS in TS/JS files.

Installation

bunx jsr add @ecopages/postcss-processor

Usage

Integrate the processor into your eco.config.ts using a preset.

Tailwind v4 Preset (Recommended)

Requires @tailwindcss/postcss and tailwindcss to be installed.

// eco.config.ts
import path from 'node:path';
import { ConfigBuilder } from '@ecopages/core/config-builder';
import { postcssProcessorPlugin } from '@ecopages/postcss-processor';
import { tailwindV4Preset } from '@ecopages/postcss-processor/presets/tailwind-v4';

const config = await new ConfigBuilder()
	.setProcessors([
		postcssProcessorPlugin(
			tailwindV4Preset({
				referencePath: path.resolve(import.meta.dirname, 'src/styles/app.css'),
			}),
		),
	])
	.build();

export default config;

Tailwind v3 Preset

Requires tailwindcss@3, autoprefixer, postcss-import, and cssnano to be installed.

// eco.config.ts
import { ConfigBuilder } from '@ecopages/core/config-builder';
import { postcssProcessorPlugin } from '@ecopages/postcss-processor';
import { tailwindV3Preset } from '@ecopages/postcss-processor/presets/tailwind-v3';

const config = await new ConfigBuilder().setProcessors([postcssProcessorPlugin(tailwindV3Preset())]).build();

export default config;

Custom Configuration

To use your own postcss.config.js, simply call postcssProcessorPlugin() without arguments.

You can also pass raw plugins or transformation hooks manually:

import { ConfigBuilder } from '@ecopages/core/config-builder';
import { postcssProcessorPlugin } from '@ecopages/postcss-processor';
import myPlugin from 'postcss-my-plugin';

const config = await new ConfigBuilder()
	.setProcessors([
		postcssProcessorPlugin({
			filter: /\.css$/,
			plugins: {
				'my-plugin': myPlugin(),
			},
			transformInput: async (css) => `/* Header */\n${css}`,
			transformOutput: async (css) => css.replace('blue', 'red'),
		}),
	])
	.build();

export default config;

Standalone Processing

You can bypass Ecopages entirely and use the processor utilities directly:

import { PostCssProcessor } from '@ecopages/postcss-processor';

// Process a file
const css = await PostCssProcessor.processPath('path/to/file.css');

// Process a string
const result = await PostCssProcessor.processStringOrBuffer('.class { @apply bg-red-500; }', { filePath: 'style.css' });