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TIL: Dealing with a jest ~import~ SyntaxError

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2019 | 作者 红领巾 ] 0人收藏点击收藏
TIL: Dealing with a jest import SyntaxError Time-stamp: <2019-01-03 14:54:57 tamara> capture-date: [2019-01-03 Thu] keywords: jest, import, SyntaxError, transformIgnorePatterns

Today, I kept getting an error while running jest tests from within a module down in /node_modules/ :

● Test suite failed to run /Users/tamara/Work/master/kickserv/node_modules/promise-polyfill/src/polyfill.js:1 ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import Promise from './index'; ^^^^^^ SyntaxError: Unexpected token import

I tried numerous options, but finally landed on this: Comment from @Izhaki describing their use of jest’s transformIgnorePatterns setting. It turns out, all that was required was to actually remove the promise-polyfill npm module from the ignore patterns:

{ "jest": { "transformIgnorePatterns": [ "node_modules/(?!(promise-polyfill)/)" ] } }

The funky expresson, ~”node_modules/(?!(promise-polyfill)/)”~ is indicating that the matching path should not be ignored, and be transpiled by jest.

The other options in that comment thread and other places were about changing the `.babelrc` file and specifying different NODE_ENV values, which I just could not make work. With this setting, the jest tests all run, and the promise polyfill works in the code running in the browser.

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