export ‘default‘ (imported as ‘Vue‘) was not found in ‘vue‘

执行运行前端命令npm run serve,有如下提示。

这样的提示如果不解决，好像也不行。它说核心vue没有找到

export 'default' (imported as 'Vue') was not found in 'vue' (possible exports: BaseTransition, BaseTransitionPropsValidators, Comment, EffectScope, Fragment, KeepAlive, ReactiveEffect, Static, Suspense, Teleport, Text, Transition, Tr
ansitionGroup, VueElement, assertNumber, callWithAsyncErrorHandling, callWithErrorHandling, camelize, capitalize, cloneVNode, compatUtils, compile, computed, createApp, createBlock, createCommentVNode, createElementBlock, createEleme
ntVNode, createHydrationRenderer, createPropsRestProxy, createRenderer, createSSRApp, createSlots, createStaticVNode, createTextVNode, createVNode, customRef, defineAsyncComponent, defineComponent, defineCustomElement, defineEmits, d
efineExpose, defineModel, defineOptions, defineProps, defineSSRCustomElement, defineSlots, devtools, effect, effectScope, getCurrentInstance, getCurrentScope, getTransitionRawChildren, guardReactiveProps, h, handleError, hasInjection
Context, hydrate, initCustomFormatter, initDirectivesForSSR, inject, isMemoSame, isProxy, isReactive, isReadonly, isRef, isRuntimeOnly, isShallow, isVNode, markRaw, mergeDefaults, mergeModels, mergeProps, nextTick, normalizeClass, no
rmalizeProps, normalizeStyle, onActivated, onBeforeMount, onBeforeUnmount, onBeforeUpdate, onDeactivated, onErrorCaptured, onMounted, onRenderTracked, onRenderTriggered, onScopeDispose, onServerPrefetch, onUnmounted, onUpdated, openB
lock, popScopeId, provide, proxyRefs, pushScopeId, queuePostFlushCb, reactive, readonly, ref, registerRuntimeCompiler, render, renderList, renderSlot, resolveComponent, resolveDirective, resolveDynamicComponent, resolveFilter, resolv
eTransitionHooks, setBlockTracking, setDevtoolsHook, setTransitionHooks, shallowReactive, shallowReadonly, shallowRef, ssrContextKey, ssrUtils, stop, toDisplayString, toHandlerKey, toHandlers, toRaw, toRef, toRefs, toValue, transform
VNodeArgs, triggerRef, unref, useAttrs, useCssModule, useCssVars, useModel, useSSRContext, useSlots, useTransitionState, vModelCheckbox, vModelDynamic, vModelRadio, vModelSelect, vModelText, vShow, version, warn, watch, watchEffect,
watchPostEffect, watchSyncEffect, withAsyncContext, withCtx, withDefaults, withDirectives, withKeys, withMemo, withModifiers, withScopeId)

最终发现
vue 版本过高与其他版本不兼容，
换成
npm install vue@2.7.0 即可