When I have two chunk files with the same text content, and I explicitly don't add [hash] in chunkNames, these two chunk files are merged into one file unexpectedly.

Minimal reproduction: https://github.com/issueset/esbuild-chunk-hash-issue

Current behavior: esbuild outputs only one chunk file

./dist/esbuild ├── chunk │   └── chunk.js └── entry ├── entry-a1.js ├── entry-a2.js ├── entry-b1.js └── entry-b2.js 

Expected behavior 1: esbuild should output two chunk files with different file names like what rollup does:

./dist/rollup ├── chunk │   ├── shared.js │   └── shared2.js └── entry ├── entry-a1.js ├── entry-a2.js ├── entry-b1.js └── entry-b2.js 

Expected behavior 2: Alternatively, esbuild can throw an error indicating that src/shared-a/shared.js and src/shared-b/shared.js share the same output path, but they should not merge into the same file.