Build warnings in Mac OS and Node v12 (development)

[markjszy]

Version

2.6.11

Reproduction link

https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup

Steps to reproduce

On Mac OS Catalina (and probably prior versions), with Node v12 installed, follow the developer build instructions:

• Clone the repository
• Run yarn

What is expected?

Successful report from yarn that all dependencies have been installed, with no warnings or errors

What is actually happening?

The following warning, followed by a slew of details (errors) concerning fsevents and one of its dependencies, nan

warning Error running install script for optional dependency: "/Users/mark/dev/vue/node_modules/fsevents: Command failed.

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Dev dependency installation works fine with Node v10. I think I understand the problem and am curious about the right solution.
Vue currently specifies webpack 4.x and karma 3.x as devDependencies, both of which ultimately bring in chokidar 2.x, which lists fsevents 1.2.x as an optional dependency.

Old fsevents is really the problem, in two ways:

• It references entities that have been removed in Node 12.x (e.g. v8::Handle; see https://github.com/fsevents/fsevents/blob/v1.2.2/fsevents.cc#L89)
• It relies on nan 2.9.x, which also references deprecated/removed entities from the v8 API (e.g. isNearDeath). Newer versions of nan have addressed this issue.

I imagine the easiest solution, assuming nothing else breaks, would be to update the karma and webpack dependencies to some minimal viable version that does away with reliance on these older libs without breaking other expectations. In the meantime, we could also put a note in the build instructions for Mac users noting that they may need to move down to Node v10 if they want to avoid this problem. I understand that this might be obvious to some audience that intends to pitch in with Vue development in the first place, but it might help some.

[posva]

Contribution welcome to update the minimal dependencies in package.json (without committing changes to yarn.lock) so the project works on Node.js 12

[ArjunDandagi]

@posva i can take this up ,please guide me what needs to be updated

[markjszy]

@ArjunDandagi unless @posva thinks otherwise, I believe the two deps that need to be bumped up (due to their own indirect deps on old fsevents) are webpack and karma