swc/crates/swc_ecma_minifier/tests/pass-1/issue-6405/1/input.js

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export const fn = () => {
let val;
if (!val) {
return undefined;
// works as expected if comment out below line
throw new Error('first');
}
if (val.a?.b !== true) { // Uncaught TypeError: Cannot read properties of undefined (reading 'a')
throw new Error('second');
}
return val;
}