install fixed versions of currently installed deps

fix-deps.js

// Usage: `node fix-deps.js`
// Pre-req: Ensure `save-prefix ""` is set in `.yarnrc`.

const {exec} = require('child_process')

// `yarn ls --depth=0` doesn't quite do what we want, see:
// https://github.com/yarnpkg/yarn/issues/3569#issuecomment-362832264.
exec('npm ls --depth 0', (_, stdout) => {
  const deps = stdout
    .trim()
    .replace(/UNMET PEER DEPENDENCY |├── |└── /g, '')
    .split('\n')
    .slice(1)
    .filter(d => !d.endsWith('extraneous'))
    .join(' ')

  // There may be some console warnings, but dev & prod dependencies should
  // still install in the right places.
  exec(`yarn add ${deps}`, (_, stdout) => {
    console.log(stdout)
  })
})