How to write Jest transformIgnorePatterns

Question

I have this excpetion

Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it\'s not p         


        

Answer 1

The transformIgnorePatterns means if the test path matches any of the patterns, it will not be transformed.

Note: DO NOT SPLIT MULTI-LINES.

The jest will ignore all node_modules via default.

So you must write like this:

"transformIgnorePatterns": [
  // all exceptions must be first line
  "/node_modules/(?!@microsoft/sp-core-library|sp-dialog|other_libs_need_transform)"
],