Root Reactive Scopes

Any reactive scopes created, such as one from effect(), must be done so within a "root" reactive scope. This is the main purpose of mount(), which you use once at the top level to create your app as shown in the first introduction.

This is so that when the app is unmounted, it can clean up any reactive scopes created within it, since reactive scopes track any reactive scopes created within them.

local source = vide.source
local effect = vide.effect

local function App()
    local count = source(0)

    effect(function()
        print(count())
    end)
end

vide.mount(App) -- works!

App() -- will error since effect() was not called within a reactive scope

The reactive graph for the above example:

%%{init: {
    "theme": "base",
    "themeVariables": {
        "primaryColor": "#1B1B1F",
        "primaryTextColor": "#fff",
        "primaryBorderColor": "#1B1B1F",
        "lineColor": "#79B8FF",
        "tertiaryColor": "#161618",
        "tertiaryBorderColor": "#161618"
    }
}}%%

flowchart

subgraph root
    direction LR
    count --> effect
end

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Root Reactive Scopes

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