fix: assign distinct initial values to both `errors` and `warnings` to prevent `isEqual` from encountering circular references

[jackblackevo]

Introduce a new constant EMPTY_WARNINGS for use with warnings to avoid both errors and warnings pointing to the same array reference.

新增一個 EMPTY_WARNINGS 給 warnings 使用，以避免 errors 與 warnings 指向同一個 array reference。

fix #649

[vercel[bot]]

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