ReferenceError: window is not defined

[cuiweiqiang]

In Node REPL when I type const mermaid = require('mermaid'); it tell me

ReferenceError:
window is not defined
at new Log (/[my project]/node_modules/mermaid/src/logger.js:87:18)
at Object. (/[my project]/node_modules/mermaid/src/mermaid.js:8:11)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.require (module.js:498:17)
at require (internal/module.js:20:19)
at repl:1:17

And I try to install it with these ways:
npm install mermaid
npm install git+https://github.com/knsv/mermaid.git
but it still not work.

My Node version is v7.7.1,
and npm version is 4.1.2

[szaliszali]

You should not require('mermaid') in a node environment. It requires a web browser (or a headless browser like PhantomJS).

Depending on your goal, you may or may not succeed by using its subcomponents as a library (see https://knsv.github.io/mermaid/#development11).
Alternatively, you can use the bundled CLI tool as an external process.

[tylerlong]

Version 7.1.0 allows you to use mermaid in node directly.(but you still need a browser environment in order to render).

Example: https://github.com/mermaidjs/mermaid-live-editor/blob/fe51c26ecf77027fd882af0c6034b1c99c555601/src/components/Preview.js#L6

[jbmusso]

Unsure if this is expected, but it looks like mermaid v8.0.0 cannot be used in Node.js (window is not defined error). Using mermaid v7.1.0 seems to work fine though.

[Schachte]

@tylerlong Why did this lose support in the v8 release?

[elgunhuseynli]

@tylerlong Still cannot use in NodeJS :(

[Schachte]

:(

[davibe]

I wanted to use mermaid JS while transpiling markdown to html+js+css. During transpilation I do not have a browser environment available (normally).