`plugin-typescript` 12.1.3 cannot find modules with custom resolution logic

[SquidDev]

• Rollup Plugin Name: Typescript
• Rollup Plugin Version: 12.1.3
• Rollup Version: 4.43.0
• Operating System (or Browser): Linux 6.15.1-arch1-2,
• Node Version: 24.2.0
• Link to reproduction (⚠️ read below): https://stackblitz.com/edit/rollup-repro-sbbqvy8r?file=rollup.config.js

Expected Behavior

On plugin-typescript 12.1.2 and below, it was possible to use a plugin with resolveId and declare module "xyz" { ... } to load modules outside the standard resolution path (for instance, loading generated sources from elsewhere).

For instance, with the following in your rollup.config.js.

    plugins: [
        typescript(),
        {
            name: "custom",
            async resolveId(source) {
                if (source === "test-module") return path.resolve("generated/test-module.js")
            }
        }
    ]

and the following declaration file:

declare module "test-module" {
    export const sayHello: () => void;
}

Then it was possible to import "test-module" from a Typescript file.

Actual Behavior

This no longer works under the recent 12.1.3 release (I assume this is introduced by #1653), failing with the following:

(!) [plugin typescript] src/index.ts (1:26): @rollup/plugin-typescript TS2307: Cannot find module 'test-module' or its corresponding type declarations.
rollup-demo/src/index.ts:1:26

1 import { sayHello } from "test-module";
                           ~~~~~~~~~~~~~

Additional Information

It's possible I'm doing something utterly unspeakable and unsupported! I wasn't sure if this was an accidental breaking change or just Hyrum's law in action, so felt worth reporting.

[filipsobol]

We're encountering a similar issue. We use @aws-sdk/client-bedrock-runtime, which overrides an import path when targeting browser environments which was respected by this plugin in v12.1.2.

However, starting with v12.1.3, it processes Node-specific files (that use dynamic imports which cause our build to fail), even though those files aren't actually used.

Here's a quick reproduction. The build fails with v12.1.3 but works when downgrading to v12.1.2: https://stackblitz.com/edit/node-vsxkvtop?file=rollup.config.mjs,package.json

[mmomtchev]

Same for me, I have:

{
  input: 'src/index.ts',
  output: {
    format: 'cjs',
    file: 'dist/cjs/index.cjs',
    sourcemap: true
  },
  plugins: [
    inject({
      fetch: 'node-fetch'
    }),
    typescript(),
    terser()
  ]
}

This allows me to use the native fetch in the browser and node-fetch in Node.js. With 12.1.3 I get:

[!] RollupError: src/tile.ts (1:9): "default" is not exported by "node_modules/node-fetch/lib/index.js", imported by "src/tile.ts".

node-fetch has a quite complex custom loading mechanism that has a CJS interface but sets manually __esModule to true.

If someone wants to take a look, here is the repo and the dependabot PR that triggered this:
mmomtchev/query-mvt#266