export DevalueError

[angeloashmore]

This PR exports DevalueError.

Access to the error class is useful for type narrowing when access to DevalueError's path property is needed. Also helpful if other errors might be thrown in the same scope.

import * devalue from "devalue";

const foo = () => void 0;

try {
  devalue.stringify(foo);
} catch (error) {
  if (error instanceof devalue.DevalueError) {
    error.path; // typed
  }
}

I added a dumb test just to check the presence of the export. I can remove it if you think it's unnecessary.

Thanks!

[0xMurage]

What about using the object name?

try {
  devalue.stringify(foo);
} catch (err) {
  if (err.constructor.name ==="DevalueError") {
    err.path; // typed
  }
}

[angeloashmore]

@0xMurage err is still unknown in your example. Checking the constructor name only checks the runtime value, not the compile-time value.

[0xMurage]

So long as the JavaScript is executed at compile time, it should return the correct value.

@angeloashmore, could you please share a small repo that reproduces your issue?

[SukkaW]

@angeloashmore, could you please share a small repo that reproduces your issue?

Here is a minimum re-production using TypeScript Playground.

As you can see, err is not typed:

[Rich-Harris]

Thank you — I just merged #126, which also exports DevalueError, so I'll close this