`ava --version` returns unknown

[broofa]

In a nutshell ...

$ npm install -D ava

$ npm ls ava
/Users/kieffer/codepen/cp/cpcompiler/processors/sass
`-- ava@4.0.1

$ type ava
ava is hashed (./node_modules/.bin/ava)

$ ava --version
unknown

[novemberborn]

This used to work with v3, how strange!

[jopemachine]

I think it is an issue of yargs.

In this code, yargs's platform-shims/esm.mjs takes different value on mainFilename with platform-shims/cjs.ts.

And in my thought, because this line stores the wrong value in the mainFilename in ESM, yargs cannot find ava's package.json in their kPkgUp function.

Maybe, I think this line needs to be changed like below or something.

const mainFilename = __dirname.substring(0, __dirname.lastIndexOf('node_modules'));