esbuild-plugins-node-modules-polyfill

esbuild-plugins-node-modules-polyfill

Polyfills nodejs builtin modules for the browser.

Description

Polyfills nodejs builtin modules and globals for the browser.

Features

• Written In Typescript
• Offers CJS and ESM builds
• Full TypeScript & JavaScript support
• Supports node: protocol
• Supports browser field in package.json
• Optionally injects globals
• Optionally provides empty fallbacks

Install

npm install --save-dev esbuild-plugins-node-modules-polyfill

Usage

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [nodeModulesPolyfillPlugin()],
});

Inject globals when detected:

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			globals: {
				process: true,
				Buffer: true,
			},
		}),
	],
});

[!Note] If you are utilizing the modules option, ensure that you include polyfills for the global modules you are using.

Configure which modules to polyfill:

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			modules: ['crypto'],
		}),
	],
});

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			modules: {
				crypto: true,
				fs: false,
			},
		}),
	],
});

Provide empty polyfills:

Provide empty polyfills for specific modules:

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			modules: {
				fs: 'empty',
				crypto: true,
			},
		}),
	],
});

Provide empty fallbacks for any unpolyfilled modules:

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			fallback: 'empty',
		}),
	],
});

Provide empty fallbacks for any unconfigured modules:

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
build({
	plugins: [
		nodeModulesPolyfillPlugin({
			fallback: 'empty',
			modules: {
				crypto: true,
			},
		}),
	],
});

Fail the build when certain modules are used:

[!Important] The write option in esbuild must be false to support this.

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
const buildResult = await build({
	write: false,
	plugins: [
		nodeModulesPolyfillPlugin({
			modules: {
				crypto: 'error',
				path: true,
			},
		}),
	],
});

Fail the build when a module is not polyfilled or configured:

[!Important] The write option in esbuild must be false to support this.

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
const buildResult = await build({
	write: false,
	plugins: [
		nodeModulesPolyfillPlugin({
			fallback: 'error',
			modules: {
				path: true,
			},
		}),
	],
});

Provide a custom error formatter when a module is not polyfilled or configured:

Return an esbuild PartialMessage object from the formatError function to override any properties of the default error message.

[!Important] The write option in esbuild must be false to support this.

import { nodeModulesPolyfillPlugin } from 'esbuild-plugins-node-modules-polyfill';
import { build } from 'esbuild';
const buildResult = await build({
	write: false,
	plugins: [
		nodeModulesPolyfillPlugin({
			fallback: 'error',
			modules: {
				path: true,
			},
			formatError({ moduleName, importer, polyfillExists }) {
				return {
					text: polyfillExists
						? `Polyfill has not been configured for "${moduleName}", imported by "${importer}"`
						: `Polyfill does not exist for "${moduleName}", imported by "${importer}"`,
				};
			},
		}),
	],
});

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Contributors ✨

Thanks goes to these wonderful people: