Docusaurus Node/SSR could not render static page with path /blog/tags/JavaScript because of following error

[JiuRanYa]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

It's normal when I use npm run start, but some errors occurred when I use 'npm run build':

Error here:

[ERROR] Docusaurus Node/SSR could not render static page with path /blog/tags/前端 because of following error:
ReferenceError: theme is not defined

Steps to reproduce

clone project from 'https://github.com/1084350607/blog'

1. npm run build

Expected behavior

build normally

Actual behavior

build error

Your environment

• Public source code: https://github.com/1084350607/blog
• Public site URL: www.siyuanwa.cn
• Docusaurus version used: 2.0.0-beat-15
• Environment name and version (e.g. Chrome 89, Node.js 16.4): 16.4
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): windows 10

Reproducible demo

No response

Self-service

• I'd be willing to fix this bug myself.

[Josh-Cena]

Your swizzled component contains a bad line: https://github.com/1084350607/blog/blob/main/src/theme/BlogPostItem/index.tsx#L85

You deliberately ts-ignored it, hence the silent error 😅 Replace that with const { isDarkTheme } = useColorMode(): https://docusaurus.io/docs/next/api/themes/configuration#use-color-mode

Please don't use the GitHub issue tracker as a support forum. It's very distracting and pollutes our repo history. Prefer any of our support channels (I'm always around on Discord)

[JiuRanYa]

Thanks so much!!