"Right-hand side of 'instanceof' is not an object" when testing NestJS + TypeORM using Jest - jestjs

Question

I have a working NestJS server that performs some TypeORM repository.insert() command. However when running the same operation from a Jest test (using #nestjs/testing's Test.createTestingModule(...), the infamous Right-hand side of 'instanceof' is not an object appears.
Looking in more details, it appears that this is due to some dynamic loading occurring in TypeORM's QueryBuilder:
// loading it dynamically because of circular issue
const InsertQueryBuilderCls = require("./InsertQueryBuilder").InsertQueryBuilder;
That line succeeds when running the NestJS server but fails when running the Jest test. More specifically:
in the NestJS server: QueryBuilder require("./InsertQueryBuilder") returns an ES module with a InsertQueryBuilder in it. When setting a breakpoint here, strangely the debugged file appears located at src/query-builder/QueryBuilder.ts (which is non-existent, and should rather be node_modules/typeorm/query-builder/QueryBuilder.js), but this succeeds.
in the Jest test: require("./InsertQueryBuilder") return an empty object, and so InsertQueryBuilder is undefined which not an object indeed. The debugged file is as expected node_modules/typeorm/query-builder/QueryBuilder.js, but this fails.
I looks like it could be related to my Jest configuration, which is:
module.exports = {
preset: 'ts-jest',
testEnvironment: 'node',
moduleDirectories: ['node_modules', 'src']
}
as my Typescript sources are under a src directory under the project root. Those path issues are also be related to my tsconfig.json, which contains:
{
"compilerOptions": {
"module": "commonjs",
"allowSyntheticDefaultImports": true,
"target": "es2019",
"baseUrl": "./src",
"outDir": "./dist",
"incremental": true,
"lib": [
"es2019"
]
}