Object with shim targets in the short-hand format result in invalid compilation

[a-miyashita]

Description

When compiling a following program that supports ES module, an invalid objects is generated.

To reproduce

1. Create src/tests.ts and scripts/build_npm.ts.

src/test.ts

export const _internals = {
  prompt,
};

scripts/build_npm.ts

import { build } from "https://deno.land/x/dnt/mod.ts";

await build({
  typeCheck: false,
  scriptModule: false,
  skipSourceOutput: true,
  entryPoints: [ `src/test.ts` ],
  outDir: "./dist",
  shims: {
     prompts: true,
  },
  package: { 
    name: "package_name",
    version: Deno.args[0],
  },
});

2. Run the following command to build the npm package:

   $ deno run -A scripts/build_npm.ts 0.1.0
   

Expected

dist/esm/test.js

export const _internals = {
    prompt: dntShim.prompt,
};

Actual

Build failed with following code and an error.

dist/esm/test.js

export const _internals = {
    dntShim, : .prompt,
};

Error message

[dnt] Transforming...
[dnt] Running npm install...

added 1 package, and audited 3 packages in 2s

found 0 vulnerabilities
[dnt] Building project...
[dnt] Emitting ESM package...
[dnt] Running tests...

> package_name@0.1.0 test
> node test_runner.js


Running tests in ./esm/test.js...

file:///tmp/tmp.j8gohGBMqN/dist/esm/test.js:3
    dntShim, : .prompt,
             ^

SyntaxError: Unexpected token ':'
    at ESMLoader.moduleStrategy (node:internal/modules/esm/translators:119:18)
    at ESMLoader.moduleProvider (node:internal/modules/esm/loader:468:14)
    at async link (node:internal/modules/esm/module_job:68:21)

Node.js v18.14.2
error: Uncaught (in promise) Error: npm run test failed with exit code 1
      throw new Error(
            ^
    at runCommand (https://deno.land/x/dnt@0.38.0/lib/utils.ts:56:13)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async build (https://deno.land/x/dnt@0.38.0/mod.ts:407:5)
    at async file:///tmp/tmp.j8gohGBMqN/scripts/build_npm.ts:3:1

Workaround

There is a workaround for this problem. It is to not use the short-hand format.

src/test.ts

export const _internals = {
  prompt: prompt,
};

will result in expected output.