perf: remove src directory from npm module

[KELiON]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Breaking change is only for users, who uses undocumented requires/imports from vue/src. After this PR all scripts from src folder are not included in npm-package

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

Other information:

src directory is not used by node package. Removing this directory reduces size of .tgz package by 112kb and saves 840kb in each node project, where vue.js is installed

[andreiglingeanu]

Agreed, almost everyone who want to build Vue themselves are using vue/dist/vue.esm.js outputs

[rigor789]

Hi, this change is a good performance improvement, however it is a breaking change for https://github.com/rigor789/nativescript-vue

Due to the nature of nativescript-vue we have to use some code from the src directory.

I am here to ask if there is a better approach to our problem, than importing directly from src?

As for this change, I have tried installing directly through GitHub, using either a tag, or a commit hash, but in all cases I got the version without the src directory. Do you have any suggestions how to move forward with this change?

[yyx990803]

Ah, yeah I realized that problem. Will revert it in a later release.