chore: remove ShapeFlags

[cuixiaorui]

Change to export from @vue/shared

No repeat declaration

[lmiller1990]

I think we decided to avoid the @vue/shared dependency and copy paste instead to simplify the bundle when used as an es module, for example. Maybe @JessicaSachs has some more context on this (mentioned here, too)? I think we talked about this one before. No dependencies is the best number of dependencies, more often than not.

[cuixiaorui]

I did some tests on this problem

After packing with yarn build

 private get hasMultipleRoots(): boolean {
    // if the subtree is an array of children, we have multiple root nodes
    return this.vm.$.subTree.shapeFlag === ShapeFlags.ARRAY_CHILDREN
  }

After the build

Object.defineProperty(VueWrapper.prototype, "hasMultipleRoots", {
            get: function () {
                // if the subtree is an array of children, we have multiple root nodes
                return this.vm.$.subTree.shapeFlag === 16 /* ARRAY_CHILDREN */;
            },
            enumerable: true,
            configurable: true
        });

Directly changes shapeflags.array_children to a number

With the rollup Tree Shaking feature, you don't need to worry about vue-test-utils.[xxx].js getting bigger

As far as package dependency is concerned, we've already had the user install the Vue, and @vue/share is what will exist once the Vue is installed, so should we really worry about this?

[lmiller1990]

I think you are correct here, I did not realize it would be able to do this. Are we able to use this in a browser (and with vite)? If this is the case, we should definitely merge this PR, it's a great improvement. I'll give it a test this evening. Thanks!

[lmiller1990]

You are right, this is not a problem. Great!