Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Error: flow_v0.38.x <=v0.52.x: Unexpected trailing characters: <=v0.52.x

See original GitHub issue

We started getting this error when running flow-typed update today:

$ yarn run flow-typed update
yarn run v0.27.5
$ "/app/node_modules/.bin/flow-typed" "update"
• Found 93 dependencies in package.json to install libdefs for. Searching...
• rebasing flow-typed cache...


UNCAUGHT ERROR: Error: flow_v0.38.x <=v0.52.x: Unexpected trailing characters:  <=v0.52.x
    at validationError (/app/node_modules/flow-typed/dist/lib/validationErrors.js:14:11)
    at parseDirString (/app/node_modules/flow-typed/dist/lib/flowVersion.js:155:45)
    at _callee2$ (/app/node_modules/flow-typed/dist/lib/npm/npmLibDefs.js:543:146)
    at tryCatch (/app/node_modules/regenerator-runtime/runtime.js:64:40)
    at Generator.invoke [as _invoke] (/app/node_modules/regenerator-runtime/runtime.js:355:22)
    at Generator.prototype.(anonymous function) [as next] (/app/node_modules/regenerator-runtime/runtime.js:116:21)
    at tryCatch (/app/node_modules/regenerator-runtime/runtime.js:64:40)
    at invoke (/app/node_modules/regenerator-runtime/runtime.js:154:20)
    at /app/node_modules/regenerator-runtime/runtime.js:164:13
    at <anonymous>
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I guess it’s related to these:

$ git grep '<=v' .
react-redux_v5.x.x.js:// flow-typed version: 19506e57e6/react-redux_v5.x.x/flow_>=v0.30.x <=v0.52.x
react-router-dom_v4.x.x.js:// flow-typed version: 19506e57e6/react-router-dom_v4.x.x/flow_>=v0.38.x <=v0.52.x
react-router_v4.x.x.js:// flow-typed version: 19506e57e6/react-router_v4.x.x/flow_>=v0.30.x <=v0.52.x

Currently we have a CI script that tries to sync our repo with flow-typed, which is where this error surfaced first:

#!/bin/bash -e

FLOW_CACHE=$HOME/.flow-typed
FLOW_REPO=$FLOW_CACHE/repo
FLOW_CACHE_BEFORE_UPDATE=$(cat $FLOW_CACHE/last-update || true)
yarn run flow-typed update-cache
FLOW_CACHE_AFTER_UPDATE=$(cd $FLOW_REPO && git rev-parse HEAD)

if [[ "$FLOW_CACHE_BEFORE_UPDATE" != "$FLOW_CACHE_AFTER_UPDATE" ]]; then
  echo "flow-typed cache updated, running flow-typed update."

  yarn run flow-typed update
  git add flow-typed
  if [[ -n "$(git diff-index --name-only HEAD)" ]]; then
    echo "flow-typed updated definitions, committing."
    git commit -am "Update flow-typed definitions"
  else
    echo "flow-typed did not update definitions, skipping"
  fi
else
  echo "flow-typed cache didn't update, skipping"
fi

echo $FLOW_CACHE_AFTER_UPDATE > $FLOW_CACHE/last-update