move env to @tailwindcss/node

This allows us to:
1. Not worry about `process` being available, because we are already in
   a node-like environment.
2. Use a proper import from the package

packages/@tailwindcss-cli/src/commands/build/index.ts

@@ -1,12 +1,11 @@
 import watcher from '@parcel/watcher'
-import { compile } from '@tailwindcss/node'
+import { compile, env } from '@tailwindcss/node'
 import { clearRequireCache } from '@tailwindcss/node/require-cache'
 import { Scanner, type ChangedContent } from '@tailwindcss/oxide'
 import { Features, transform } from 'lightningcss'
 import { existsSync } from 'node:fs'
 import fs from 'node:fs/promises'
 import path from 'node:path'
-import * as env from '../../../../tailwindcss/src/env'
 import type { Arg, Result } from '../../utils/args'
 import { Disposables } from '../../utils/disposables'
 import {

packages/tailwindcss/src/env.ts → packages/@tailwindcss-node/src/env.ts

@@ -1,4 +1,4 @@
-export const DEBUG = typeof process !== 'undefined' ? resolveDebug(process.env.DEBUG) : false
+export const DEBUG = resolveDebug(process.env.DEBUG)
 
 function resolveDebug(debug: typeof process.env.DEBUG) {
   if (debug === undefined) {

packages/@tailwindcss-node/src/index.cts

@@ -1,7 +1,9 @@
 import * as Module from 'node:module'
 import { pathToFileURL } from 'node:url'
+import * as env from './env'
 export * from './compile'
 export * from './normalize-path'
+export { env }
 
 // In Bun, ESM modules will also populate `require.cache`, so the module hook is
 // not necessary.

packages/@tailwindcss-node/src/index.ts

@@ -1,7 +1,9 @@
 import * as Module from 'node:module'
 import { pathToFileURL } from 'node:url'
+import * as env from './env'
 export * from './compile'
 export * from './normalize-path'
+export { env }
 
 // In Bun, ESM modules will also populate `require.cache`, so the module hook is
 // not necessary.

packages/@tailwindcss-postcss/src/index.ts

@@ -1,11 +1,10 @@
-import { compile } from '@tailwindcss/node'
+import { compile, env } from '@tailwindcss/node'
 import { clearRequireCache } from '@tailwindcss/node/require-cache'
 import { Scanner } from '@tailwindcss/oxide'
 import fs from 'fs'
 import { Features, transform } from 'lightningcss'
 import path from 'path'
 import postcss, { type AcceptedPlugin, type PluginCreator } from 'postcss'
-import * as env from '../../tailwindcss/src/env'
 import fixRelativePathsPlugin from './postcss-fix-relative-paths'
 
 /**

packages/@tailwindcss-vite/src/index.ts

@@ -1,10 +1,9 @@
-import { compile, normalizePath } from '@tailwindcss/node'
+import { compile, env, normalizePath } from '@tailwindcss/node'
 import { clearRequireCache } from '@tailwindcss/node/require-cache'
 import { Scanner } from '@tailwindcss/oxide'
 import { Features, transform } from 'lightningcss'
 import path from 'path'
 import type { Plugin, ResolvedConfig, Rollup, Update, ViteDevServer } from 'vite'
-import * as env from '../../tailwindcss/src/env'
 
 export default function tailwindcss(): Plugin[] {
   let servers: ViteDevServer[] = []