Sequence diagrams hang up due to lack of spaces after "as"

[shiniizk]

Description

The code following makes browser hang up. The point is the lack of the space after "as".

sequenceDiagram
participant X_AutoPublishable asAAAAAAAAAAAAA:AAAAAAAAAAAAA

Steps to reproduce

Put this code into Mermaid Live Editor or other editors.

sequenceDiagram
participant X_AutoPublishable asAAAAAAAAAAAAA:AAAAAAAAAAAAA

Screenshots

No response

Code Sample

sequenceDiagram
participant X_AutoPublishable asAAAAAAAAAAAAA:AAAAAAAAAAAAA

Setup

• Mermaid version: v11.5.0
• Browser and Version: Chrome 134.0.6998.89 / macOS 15.2

Suggested Solutions

No response

Additional Context

No response

[BambioGaming]

The hang in Mermaid.js sequence diagrams when omitting a space after as (e.g. participant X asY) is due to how the parser interprets tokens in the diagram syntax. To avoid this issue, ensure that there is a space after the "as" keyword in participant declarations:

sequenceDiagram
participant X_AutoPublishable as AAAAAAAAAAAAA:AAAAAAAAAAAAA

Better error handling and clearer grammar definitions could prevent this hang entirely.