`project.resolveSourceFileDependencies()` behavior depends on whether files are added manually

[hoodmane]

Describe the bug

Version: 27.0.0

If I don't manually add files to the project and rely on the tsconfig.json "include" key, project.resolveSourceFileDependencies() returns nothing. If I add the same files with a glob using addSourceFilesAtPaths(), project.resolveSourceFileDependencies() returns a lot of stuff.

To Reproduce

import { Project } from "ts-morph";

function main() {
  const project = new Project({
    tsConfigFilePath: "../input-project/tsconfig.json",
    libFolderPath:
      "../input-project/node_modules/typescript/lib",
  });
  console.log("Automatic:")
  console.log(project.getSourceFiles().map(x => x.getFilePath()));
  console.log(project.resolveSourceFileDependencies().map(x => x.getFilePath()));

  console.log("Manual:")
  const sourceFile = "../input-project/*.ts";
  console.log(project.addSourceFilesAtPaths(sourceFile).map(x => x.getFilePath()));
  console.log(project.getSourceFiles().map(x => x.getFilePath()));
  console.log(project.resolveSourceFileDependencies().map(x => x.getFilePath()));
  return;
}
main();

And ../input-project looks like:

a.ts

Empty file

tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "noEmit": true,
    "allowImportingTsExtensions": true,
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "esModuleInterop": true,
    "lib": ["es5"],
    "types": []
  },
  "include": ["*.ts"]
}

package.json

{
  "dependencies": {
    "typescript": "^5.3.2"
  }
}

To Trigger

First run npm i in the input-project folder, then run npm i ts-morph in the folder with the script, then run the script.

Actual output

Automatic:
 source files: [
  '/path/to/project/input-project/a.ts'
]
 deps: []
Manual:
 added source files: [
  '/path/to/project/input-project/a.ts'
]
 source files: [
  '/path/to/project/input-project/a.ts'
]
 deps: [
  '/path/to/project/input-project/node_modules/typescript/lib/lib.es5.d.ts',
  '/path/to/project/input-project/node_modules/typescript/lib/lib.decorators.d.ts',
  '/path/to/project/input-project/node_modules/typescript/lib/lib.decorators.legacy.d.ts'
]

Expected behavior

Adding the same files specified in tsconfig.json again shouldn't change the output of resolveSourceFileDependencies().