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35 lines
956 B
Markdown
35 lines
956 B
Markdown
# Strict Mode
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While developing UI with Vide, you should use Vide's strict mode, which can
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be set with `vide.strict = true` once when you first require Vide. Strict mode
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will add extra safety checks and emit better error traces, particularly when
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errors occur in property bindings.
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Strict mode is automatically enabled when Vide is required in O0 or O1
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optimization (default studio level). You can `vide.strict = false` if you do not
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want this.
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Strict mode will run derived sources and effects twice each time they update.
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This is to help ensure that derived source computations are pure, and that any
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cleanups made in derived sources or effects are done properly.
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```lua
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local source = vide.source
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local effect = vide.effect
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vide.strict = true
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local count = source(0)
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local ran = 0
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effect(function()
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ran += 1
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end)
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print(ran) -- 2
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count(1)
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print(ran) -- 4
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```
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A full list of what strict mode will do can be found
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[here](../../api/strict-mode).
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