GRIT Build

A thin wrapper around esbuild and LightningCSS to make building for the web fast and simple.

Features

• Tailwind support.
• SCSS support.
• Manifest file generation.
• Browsersync when gritBuild is executed with a --watch flag.
• Accessibility testing with pa11y.
• Lighthouse testing with lighthouse.

Getting Started

npm install @gritdigital/grit-build --save-dev

Example Usage

import gritBuild from "@gritdigital/grit-build";

gritBuild({
	build: {
		esbuild: {
			entryPoints: [
				{
					in: "./resources/ts/index.ts",
					out: "js/index",
				},
				{
					in: "./resources/styles/index.scss",
					out: "css/index",
				},
			],
			outdir: "./theme/assets",
			loader: {
				".woff2": "file",
			},
		},
		output: {
			clear: true,
			preserve: ["images"],
		},
		manifest: ["js/index.js", "css/index.css"],
	},
	dev: {
		server: {
			url: "https://example.grit",
		},
		watch: ["./theme/pages/**/*.html"],
	},
});

Regardless of where gritBuild is called, the paths should be relative to your projects root.

Interface

interface GritBuildConfig {
	/**
	 * Core build configuration
	 */
	build: {
		/** Required esbuild configuration - https://esbuild.github.io/ */
		esbuild: BuildOptions;
		/** Output directory configuration */
		output?: {
			/** Clear output directory before build */
			clear?: boolean;
			/** Patterns to ignore when clearing output directory */
			preserve?: string[];
			/** Files to remove after build completion */
			cleanup?: string[];
		};
		/** Files to include in the build manifest */
		manifest?: string[];
	};

	/**
	 * Asset management configuration
	 */
	assets?: {
		/** Directory copy operations */
		copy?: Array<{
			from: string;
			to: string;
		}>;
	};

	/**
	 * CSS processing configuration
	 */
	styles?: {
		/** Tailwind CSS configuration */
		tailwind?: {
			enabled?: boolean; // true
			config?: string;
		};
		/** LightningCSS transform options */
		lightning?: Omit<TransformOptions<CustomAtRules>, "filename" | "code">;
	};

	/**
	 * Development configuration
	 */
	dev?: {
		/** BrowserSync configuration */
		server?: {
			/** Site URL for proxying */
			url: string;
			/** BrowserSync specific options */
			options?: Exclude<browserSync.Options, "proxy">;
		};
		/** Directories to watch for changes */
		watch?: string[];
	};
}

Build Targets

JavaScript

The default esbuild target is set to the following:

• Chrome 129
• Firefox 129
• Safari 15

If you need to override this, you can do so by setting the target property in the esbuild config. You can find the list of supported targets here.

gritBuild({
    build: {
        esbuild: {
            target: ["chrome129", "firefox129", "safari15"],
        },
    }
});

CSS

The default LightningCSS target is set to >= 0.25% meaning it will support browsers that make up more or equal to 0.25% of global usage.

You can override this like so:

import browserslist from "browserslist";
import { browserslistToTargets } from "lightningcss";

gritBuild({
    styles: {
        lightning: {
            targets: browserslistToTargets(browserslist(">= 0.25%"))
        }
    }
});

Plugins

Esbuild Plugins

import {
  copyDirsPlugin,
  manifestPlugin,
  clearOutdirPlugin,
  browserSyncPlugin,
  removeFilesPlugin,
} from "@gritdigital/grit-build/esbuild";

Eslint Plugin

// .eslint.config.mjs
import gritEslint from "@gritdigital/grit-build/eslint";

export default [
    ...gritEslint.configs.recommended,
]

Prettier Plugins

// .prettier.config.js

export { default } from "@gritdigital/grit-build/prettier";

// or

import prettier from "@gritdigital/grit-build/prettier";

export default {
  ...prettier,
  // your custom config
}

Helpers

getTwigImportPaths

This is a helper function for Twig and Tailwind setups that allows you to recursively find all of the twig include/embed paths for a given set of components. This is inteded to be used in conjunction with Tailwind's content property.

import { getTwigImportPaths } from "@gritdigital/grit-build/helpers";

export default {
  content: [
    "theme/**/*.html",
    ...getTwigImportPaths({
      root: "views",
      components: ["blocks/block-1.twig", "blocks/block-2.twig"],
      // aliases: {
        // "@ui/": "",
      // },
      ignoreComponents: [],
      ignoreImports: [],
    }),
  ],
  theme: {
    extend: {},
  },
  plugins: [],
};

Testing

Accessibility

npx grit-tests-accessibility --sitemap https://mysite.local/sitemap_index.xml --standard WCAG2AA --url https://mysite.local

If you provide both a sitemap and url, the url will be used as the default. Its recommended to just provide one of the two flags.

Lighthouse

npx grit-tests-lighthouse --url https://mysite.local