Meteor 2.5.X new project with message "React is running in production mode, but dead code elimination has not been applied"

help
1

Could you try to reproduce or check my commands?

meteor create --typescript myapp
cd myapp
meteor build --directory .build --architecture=os.linux.x86_64 --server-only --platforms=web.browser
cd .build/bundle
export NODE_ENV=production
(cd programs/server && npm install)
node main.js

image
image1325×90 3.98 KB

Uncaught Error: React is running in production mode, but dead code elimination has not been applied. Read how to correctly configure React for production: https://reactjs.org/link/perf-use-production-build

I’ve also checked that meteor --production gives the same error message

2

Hello!
I can’t reproduce what you are seeing… What is the value of NODE_ENV when you are running the meteor build command or the meteor --production?

I’ve tried both, and react is minified correctly, also Meteor.isProduction is correctly set.

3

Thank you
That’s a nice clue, so I’ve changed my command to

meteor create --typescript myapp
cd myapp
export NODE_ENV=production
meteor build --directory .build --architecture=os.linux.x86_64 --server-only --platforms=web.browser
cd .build/bundle
(cd programs/server && npm install)
node main.js

And I also tried

export NODE_ENV=production
meteor --production

But I still got the same error

4

Here is a bash script with docker that you can use to reproduce. Just copy and paste on your terminal

dockerfile="FROM ubuntu:20.04
ENV DEBIAN_FRONTEND noninteractive
ENV LANG=\"C.UTF-8\"
ENV TZ=Etc/Universal
RUN ln -snf /usr/share/zoneinfo/\$TZ /etc/localtime && echo \$TZ > /etc/timezone
RUN apt-get update && \
  apt-get install -y sudo tzdata
RUN useradd -ms /bin/bash ubuntu && \
  usermod -aG sudo ubuntu
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
USER ubuntu
WORKDIR /home/ubuntu
RUN sudo apt-get install wget curl git -y
RUN sudo mkdir -p /usr/local/n && \
  sudo chown -R \$(whoami) /usr/local/n && \
  sudo mkdir -p /usr/local/bin /usr/local/lib /usr/local/include /usr/local/share && \
  sudo chown -R \$(whoami) /usr/local/bin /usr/local/lib /usr/local/include /usr/local/share
RUN wget -q -O n https://raw.githubusercontent.com/tj/n/master/bin/n && \
  bash n install 14.18.1
RUN npm install -g meteor
ENV PATH=\"/home/ubuntu/.meteor:\${PATH}\"
WORKDIR /home/ubuntu
"

echo "$dockerfile" | docker build -t meteor-ubuntu:2.5.1 -

docker run -it \
  --rm \
  -p 3000:3000 \
  --entrypoint /bin/bash \
  meteor-ubuntu:2.5.1 -c "meteor --version && \
  meteor create --typescript myapp && \
  cd myapp && \
  NODE_ENV=production meteor --production"
5

I also found that you need to have React Devtools to get this error

6

Finally, if you use meteor create --release=2.4 ... in the script above, you won’t see that error, so it’s probably a bug
I’m going to report to github as well