TypeError: config.transforms[index] is not a function

Subject of the issue

Failing unit tests when using react-markdown which using this library

   ● Some test with react-markdown in jest using testing-library
     TypeError: config.transforms[index] is not a function
   
at compile (../node_modules/mdast-util-from-markdown/dist/index.js:226:38)
at fromMarkdown (../node_modules/mdast-util-from-markdown/dist/index.js:24:27)
at parse (../node_modules/remark-parse/index.js:13:12)
at Function.parse (../node_modules/unified/index.js:284:12)
at ReactMarkdown (../node_modules/react-markdown/lib/react-markdown.js:42:42)
at renderWithHooks (../node_modules/react-dom/cjs/react-dom.development.js:16260:18)
at mountIndeterminateComponent (../node_modules/react-dom/cjs/react-dom.development.js:18794:13)
at beginWork$1 (../node_modules/react-dom/cjs/react-dom.development.js:20162:16)
at HTMLUnknownElement.callCallback (../node_modules/react-dom/cjs/react-dom.development.js:336:14)
at invokeEventListeners (../node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:193:27)
at HTMLUnknownElementImpl._dispatch (../node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:119:9)
at HTMLUnknownElementImpl.dispatchEvent (../node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:82:17)
at HTMLUnknownElementImpl.dispatchEvent (../node_modules/jsdom/lib/jsdom/living/nodes/HTMLElement-impl.js:30:27)
at HTMLUnknownElement.dispatchEvent (../node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:157:21)
at Object.invokeGuardedCallbackDev (../node_modules/react-dom/cjs/react-dom.development.js:385:16)
at invokeGuardedCallback (../node_modules/react-dom/cjs/react-dom.development.js:440:31)
at beginWork$$1 (../node_modules/react-dom/cjs/react-dom.development.js:25780:7)
at performUnitOfWork (../node_modules/react-dom/cjs/react-dom.development.js:24698:12)
at workLoopSync (../node_modules/react-dom/cjs/react-dom.development.js:24671:22)
at performSyncWorkOnRoot (../node_modules/react-dom/cjs/react-dom.development.js:24270:11)
at ../node_modules/react-dom/cjs/react-dom.development.js:12199:24
at unstable_runWithPriority (../node_modules/scheduler/cjs/scheduler.development.js:697:12)
at runWithPriority$2 (../node_modules/react-dom/cjs/react-dom.development.js:12149:10)
at flushSyncCallbackQueueImpl (../node_modules/react-dom/cjs/react-dom.development.js:12194:7)
at flushSyncCallbackQueue (../node_modules/react-dom/cjs/react-dom.development.js:12182:3)
at scheduleUpdateOnFiber (../node_modules/react-dom/cjs/react-dom.development.js:23709:9)
at dispatchAction (../node_modules/react-dom/cjs/react-dom.development.js:17076:5)

Your environment

• OS: Mac os
• Packages: version “0.8.4”
• Env: node 15, yarn 1.22, jest 26

Steps to reproduce

rendering a markdown with react-markdown. it works in our prod. works when working locally with the unit tests but it fails in our pipeline so I’m really sorry that i cant reproduce that easily. but maybe that’s enught for you to tackle or understand what’s the issue or if mdast-util-from-markdown should handle that case

Expected behavior

What should happen? handle that case, without exploding or provide a better error explaining what went wrong

Actual behavior

exploding on this code block https://github.com/syntax-tree/mdast-util-from-markdown/blob/16c95f55298acb90f69cd253601672eb78e1b4d4/lib/index.js#L225

[AlonMiz]

Thanks, will try

[wooorm]

Fixed already: rm -r node modules; npm install should do the trick!