Simultaneous builds are unreliable

src/index.js の539行目付近から始め、キャッシュディレクトリが rollup-plugin-typescript2 にどのように渡されているかを調べます。CI形式のセットアップで microbundle のビルドを2つ同時に再現し、その後、キャッシュを無効にするかキャッシュの場所を分離することで、並行ビルドによって報告されている ENOENT の rename エラーが発生しなくなったことを確認します。

Hi, foremost, thank you for this tool, it helped me quite a lot.

I use it in a CI pipeline, and it builds two versions of the same script (with some modules being replaced).
When I tried to optimize the duration it takes, I changed to building the two versions simultaneously, that actually does save time. But once every 15 runs I get this error:

Error: ENOENT: no such file or directory, rename './node_modules/.cache/.rts2_cache_umd/rpt2_4ac624c30e398d7abd448e108f7ef395666c7280/code/cache_' -> './node_modules/.cache/.rts2_cache_umd/rpt2_4ac624c30e398d7abd448e108f7ef395666c7280/code/cache'
Error: ENOENT: no such file or directory, rename './node_modules/.cache/.rts2_cache_umd/rpt2_4ac624c30e398d7abd448e108f7ef395666c7280/code/cache_' -> './node_modules/.cache/.rts2_cache_umd/rpt2_4ac624c30e398d7abd448e108f7ef395666c7280/code/cache'
    at Object.renameSync (node:fs:1026:3)
    at RollingCache.roll (/---/scripts/node_modules/rollup-plugin-typescript2/dist/rollup-plugin-typescript2.cjs.js:29229:26)

I tracked it down to this line
which explains what happens. When more than one microbundle script is running, it instructs typescript to use the same cache directory and most likely starts to mess up or rename files that the other version already deleted.

My probosals:

• implement a flag to disable this type of caching, or use a random string for the cacheRoot
• generate a simple hash of the arguments provided and use that in combination of cacheRoot, this will prevent two scripts doing different jobs of interfering with each other

Please let me know if you would accept a PR for either of those implementations