fix: change to weaker type definitions

[YangJonghun]

Summary

change to weaker type definitions (partial revert commit bd74375)
because current definition doesn't support below case

• dev

{
  "public": {
    "OPTIONAL1": "test",
    "REQUIRE": "false"
  }
}

• prod

{
  "public": {
    "OPTIONAL2": "test",
    "REQUIRE": "false"
  }
}

above case we met type error

Changelog

change to weaker type definitions

Test Plan

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