Dynamic import of .ts files do not get transpiled

I am using the latest version of esbuild to bundle an application that dynamically tries to import a given .js file. When running I receive the following warning: ```[WARNING] The glob pattern import("./**/*.js") did not match any files [empty-glob]```

I was assuming that esbuild would transpile the .ts files to .js files and that the import wouldn't be a problem. Is this by design, and are there workarounds? Making the .ts files also entrypoints doesn't seem to make a difference.

The minimal reproduction can be seen [here](https://esbuild.github.io/try/#YgAwLjI1LjEwAHtidW5kbGU6IHRydWUsIGZvcm1hdDogJ2VzbScsIHRhcmdldDogJ2VzMjAyNCcsIG1pbmlmeTogdHJ1ZSwgb3V0ZGlyOiAnZGlzdCd9AGUAZW50cnkudHMAY29uc3QgbmFtZSA9ICJ0ZXN0IjsKaW1wb3J0IChgLi8ke25hbWV9LmpzYCkAZQBmb28udHMAAGUAZGVycC50cwA).

Start with the linked esbuild playground reproduction, which uses entry.ts, foo.ts, and dep.ts and dynamically imports a generated .js path. Read the reproduction and investigate how the glob pattern import is handled; done means determining whether the TypeScript files should be included or documenting the intended behavior and workaround.

Written by the indexing model from the issue text.