Function getFirstMockResult

Test function. Returns first mockImplementation result. Throws an error if result is not found. See example:

const override = jest
  .spyOn(console, 'warn')
  .mockImplementation(log => JSON.parse(`{"prop": '${log}' }`));

console.warn('test');

const result = getMockResult<{ prop: string }>(override); //result = { prop: 'test' }
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