svelte-remove-attributes-preprocessor

Svelte / SvelteKit preprocessor to remove specified attributes (e.g., data-testid, data-cy) at build time. Supports spread syntax and can be enabled via environment variables.

Features

• 🗑️ Remove attributes at build time (e.g., data-testid)
• 🔄 Supports spread syntax ({...props})
• 🌍 Environment variable-based toggling

Installation

pnpm add -D svelte-remove-attributes-preprocessor

Usage

Basic Usage

Add the preprocessor to your svelte.config.js:

import { removeAttributesPreprocessor } from 'svelte-remove-attributes-preprocessor';

export default {
	preprocess: [
		removeAttributesPreprocessor({
			attributes: ['data-testid']
		})
	]
};

With Environment Variable

Enable/disable attribute removal via environment variable:

import { removeAttributesPreprocessor } from 'svelte-remove-attributes-preprocessor';

export default {
	preprocess: [
		removeAttributesPreprocessor({
			envVar: 'STRIP_ATTRIBUTES', // default: 'STRIP_ATTRIBUTES'
			expected: '1', // default: '1'
			attributes: ['data-testid']
		})
	]
};

Then set the environment variable when building:

STRIP_ATTRIBUTES=1 pnpm build

SvelteKit

For SvelteKit, add it to vite.config.js or svelte.config.js:

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import { removeAttributesPreprocessor } from 'svelte-remove-attributes-preprocessor';

export default defineConfig({
	plugins: [sveltekit()],
	// ... other config
});

// In svelte.config.js
import adapter from '@sveltejs/adapter-auto';
import { removeAttributesPreprocessor } from 'svelte-remove-attributes-preprocessor';

export default {
	kit: {
		adapter: adapter()
	},
	preprocess: [
		removeAttributesPreprocessor({
			attributes: ['data-testid']
		})
	]
};

Options

Option	Type	Default	Description
attributes	string[]	[]	Array of attribute names to remove
envVar	string	'STRIP_ATTRIBUTES'	Environment variable name to check
expected	string	'1'	Expected value for the environment variable

Examples

Remove test attributes in production

// svelte.config.js
import { removeAttributesPreprocessor } from 'svelte-remove-attributes-preprocessor';

export default {
	preprocess: [
		removeAttributesPreprocessor({
			attributes: ['data-testid', 'data-cy', 'data-test']
		})
	]
};

Conditional removal via environment

// Only remove attributes when STRIP_ATTRIBUTES=1
removeAttributesPreprocessor({
	envVar: 'STRIP_ATTRIBUTES',
	expected: '1',
	attributes: ['data-testid']
})