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The MetaMask extension has this feature to warn about transaction errors before a transaction is being made:

ALERT: Transaction Error. Exception thrown in contract code.

How is this done? A dry run of some sorts? Can I get this info about an upcoming transaction error in my JavaScript code too - before triggering a transaction to be signed by MetaMask? I am using react, drizzle, truffle and solidity.

And a follow-up question: unfortunately MetaMask doesn't show the contents of errors thrown by require() statements in solidity smart contracts. When I trigger the same error in truffle console however, I do see those contents. Is there a way to get this in the frontend?

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