support multiple tsconfigs

[tommy-mitchell]

Bug description

My project has separate tsconfig.json files for source and test files. When setting up the paths compiler option, my IntelliSense correctly provides type information for imports, but tsx fails with the ERR_MODULE_NOT_FOUND error.

Reproduction

https://github.com/tommy-mitchell/tsx-repro

// test/test.ts
import assert from "node:assert";
import { foo } from "~/index.ts"; // Errors here
import type { Foo } from "~/types.ts";

assert.strictEqual(foo() as Foo, "bar");

Environment

System:
	OS: macOS 13.3.1
	CPU: (4) x64 Intel(R) Core(TM) i5-7360U CPU @ 2.30GHz
	Memory: 107.30 MB / 8.00 GB
	Shell: 5.9 - /bin/zsh
Binaries:
	Node: 18.16.1 - ~/.nvm/versions/node/v18.16.1/bin/node
	Yarn: 1.22.19 - ~/.nvm/versions/node/v18.16.1/bin/yarn
	npm: 9.5.1 - ~/.nvm/versions/node/v18.16.1/bin/npm
	pnpm: 8.6.7 - ~/.nvm/versions/node/v18.16.1/bin/pnpm
npmPackages:
	tsx: ^3.12.7 => 3.12.7

Can you work on a fix?

• I’m interested in opening a pull request to address this issue.

[tommy-mitchell]

Sorry for posting in the other issue, thought it'd be relevant because they were both about the paths option :) my bad.

[tommy-mitchell]

Maybe this has to do with how @esbuild-kit/esm-loader loads tsconfig.json? At a glance, it looks like it's only loaded once per project: https://github.com/esbuild-kit/esm-loader/blob/13ce0ca4978635618bc65bc94f3c8f92131d45c1/src/utils.ts#L13-L23