tequila backport: Fix validation error messages in the browser #9093
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Backports #9073 to
release-tequila
We converted the ParsingError and ValidationError classes to inherit from the built-in Error class in #9025. This works fine in ES6, so our unit tests were happy. However, transpiling it down to ES5 leads to an absence of the message property, essentially removing the text of parsing and validation errors.
See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Custom_Error_Types for a discussion of Error inheritance.
Needs backport to 1.6