'why does running `which` in a node child process result in different results?

when running the which command in terminal (for example, which yarn), I get a different result from when I'm running a node script (from the same location) which calls execSync('which yarn')

can someone explain why?

tldr;

// in terminal
which yarn
// results in 
/Users/xxx/.nvm/versions/node/v17.1.0/bin/yarn

// in node
execSync('which yarn')
// results in
/var/folders/0j/xxx/T/yarn--xxx/yarn

node.js terminal

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'why does running `which` in a node child process result in different results?

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