riot-web/docs/app-load.md

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# App load order
**Dev note**: As of March 2022, the skin is no longer part of the app load order at all. The document's graphs have
been kept untouched for posterity.
Old slow flow:
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```mermaid
flowchart TD
A1(((load_modernizr))) --> B
A2((rageshake)) --> B
B(((skin))) --> C
C(((olm))) --> D
D{mobile} --> E
E((config)) --> F
F((i18n)) --> G
style F stroke:lime
G(((theme))) --> H
H(((modernizr))) --> app
style H stroke:red
```
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Current more parallel flow:
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```mermaid
flowchart TD
subgraph index.ts
style index.ts stroke:orange
A[/rageshake/] --> B{mobile}
B-- No -->C1(.)
B-- Yes -->C2((redirect))
C1 --> D[/olm/] --> R
C1 --> E[platform] --> F[/config/]
F --> G1[/skin/]
F --> R
G1 --> H
G1 --> R
F --> G2[/theme/]
G2 --> H
G2 --> R
F --> G3[/i18n/]
G3 --> H
G3 --> R
H{modernizr}-- No --> J((incompatible))-- user ignore --> R
H-- Yes --> R
linkStyle 0,7,9,11,12,14,15 stroke:blue;
linkStyle 4,8,10,13,16 stroke:red;
end
R>ready] --> 2A
style R stroke:gray
subgraph init.tsx
style init.tsx stroke:lime
2A[loadApp] --> 2B[matrixchat]
end
```
Key:
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- Parallelogram: async/await task
- Box: sync task
- Diamond: conditional branch
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- Circle: user interaction
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- Blue arrow: async task is allowed to settle but allowed to fail
- Red arrow: async task success is asserted
Notes:
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- A task begins when all its dependencies (arrows going into it) are fulfilled.
- The success of setting up rageshake is never asserted, element-web has a fallback path for running without IDB (and thus rageshake).
- Everything is awaited to be settled before the Modernizr check, to allow it to make use of things like i18n if they are successful.
Underlying dependencies:
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```mermaid
flowchart TD
A((rageshake))
B{mobile}
C((config))
D(((olm)))
E((i18n))
F(((load_modernizr)))
G(((modernizr)))
H(((skin)))
I(((theme)))
X[app]
A --> G
A --> B
A-- assert -->X
F --> G --> X
G --> H --> X
C --> I --> X
C --> E --> X
E --> G
B --> C-- assert -->X
B --> D --> X
style X stroke:red
style G stroke:red
style E stroke:lime
linkStyle 0,11 stroke:yellow;
linkStyle 2,13 stroke:red;
```