refactor: tweak devtools

packages/runtime-dom/src/index.ts

@@ -13,7 +13,6 @@ import { nodeOps } from './nodeOps'
 import { patchProp } from './patchProp'
 // Importing from the compiler, will be tree-shaken in prod
 import { isFunction, isString, isHTMLTag, isSVGTag, extend } from '@vue/shared'
-import './devtools'
 
 declare module '@vue/reactivity' {
   export interface RefUnwrapBailTypes {

packages/vue/src/dev.ts

@@ -0,0 +1,16 @@
+import { version, setDevtoolsHook } from '@vue/runtime-dom'
+
+export function initDev() {
+  const target: any = __BROWSER__ ? window : global
+
+  target.__VUE__ = version
+  setDevtoolsHook(target.__VUE_DEVTOOLS_GLOBAL_HOOK__)
+
+  if (__BROWSER__) {
+    // @ts-ignore `console.info` cannot be null error
+    console[console.info ? 'info' : 'log'](
+      `You are running a development build of Vue.\n` +
+        `Make sure to use the production build (*.prod.js) when deploying for production.`
+    )
+  }
+}

packages/vue/src/index.ts

@@ -1,11 +1,13 @@
 // This entry is the "full-build" that includes both the runtime
 // and the compiler, and supports on-the-fly compilation of the template option.
-import './devCheck'
+import { initDev } from './dev'
 import { compile, CompilerOptions, CompilerError } from '@vue/compiler-dom'
 import { registerRuntimeCompiler, RenderFunction, warn } from '@vue/runtime-dom'
 import * as runtimeDom from '@vue/runtime-dom'
 import { isString, NOOP, generateCodeFrame, extend } from '@vue/shared'
 
+__DEV__ && initDev()
+
 const compileCache: Record<string, RenderFunction> = Object.create(null)
 
 function compileToFunction(

packages/vue/src/runtime.ts

@@ -1,8 +1,10 @@
 // This entry exports the runtime only, and is built as
 // `dist/vue.esm-bundler.js` which is used by default for bundlers.
-import './devCheck'
+import { initDev } from './dev'
 import { warn } from '@vue/runtime-dom'
 
+__DEV__ && initDev()
+
 export * from '@vue/runtime-dom'
 
 export const compile = () => {