ERC-20 total supply unit?

Does ERC-20 total supply takes in ether or wei?

for eg: say I want to mint 1 token for my token A supply. should it be

_mint(msg.sender, 1)
_mint(msg.sender, 1 ether)

if you want 1 token, use this format as long as your decimals are 18,

but it is recommended to use this format

_mint (msg.sender, 1 * 10 ** decimals ());

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