[Bug] File descriptors aren't supported in the FS layer

[arcanis]

Describe the bug

Our FS layer doesn't support file descriptors at the moment, which causes issues in some cases (particularly ESLint).

To fix that, we need to:

• Create a new type in path.ts, FSPath<T>, which is T | number
• Use FSPath<NativePath> in the fs functions that accepts file descriptors
• Update ProxiedFS to accept/return a FSPath<T> instead of Path
• Update ProxiedFS to not call mapFromBase / mapToBase on fds

To Reproduce

const {openSync, readFileSync, writeFileSync} = require(`fs`);

writeFileSync(`foo`, `hello world`);
const fd = openSync(`foo`, `r`);

expect(() => readFileSync(fd)).not.toThrow();

Additional context

Ref SublimeLinter/SublimeLinter#1644

[yarnbot]

This issue reproduces on master:

Error: expect(received).not.toThrow()

Error name:    "TypeError"
Error message: "p.match is not a function"

      27972 |     }
      27973 |     mapToBase(p) {
    > 27974 |         const match = p.match(this.mapToBaseRegExp);
            |                         ^
      27975 |         if (!match)
      27976 |             return p;
      27977 |         if (match[3])

      at VirtualFS.mapToBase (../../github/workspace/.pnp.js:27974:25)
      at VirtualFS.readFileSync (../../github/workspace/.pnp.js:25739:50)
      at PosixFS.readFileSync (../../github/workspace/.pnp.js:25739:32)
      at expect (evalmachine.<anonymous>:7:14)
      at Object.<anonymous> (../../github/workspace/.yarn/cache/expect-npm-24.8.0-71cbc75691.zip/node_modules/expect/build/toThrowMatchers.js:81:11)
      at Object.throwingMatcher [as toThrow] (../../github/workspace/.yarn/cache/expect-npm-24.8.0-71cbc75691.zip/node_modules/expect/build/index.js:342:33)
      at module.exports (evalmachine.<anonymous>:7:36)
      at executeInTempDirectory (../../github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:56:19)
      at executeInTempDirectory (../../github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:17:22)
      at Object.executeRepro (../../github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:24:18)
    at module.exports (evalmachine.<anonymous>:7:36)
    at executeInTempDirectory (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:56:19)
    at executeInTempDirectory (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:17:22)
    at Object.executeRepro (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:24:18)
    at ExecCommand.execute (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.18-6d5236b6bc.zip/node_modules/@arcanis/sherlock/lib/commands/exec.js:25:59)

[arcanis]

Fixed with #363