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mode.getBreakpoint(): Promise<BreakpointId | null>

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// Get Collection
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const collection = await webflow.getDefaultVariableCollection()
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// Get Variable Mode
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const variableMode = await collection?.getVariableModeByName(modeName)
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try {
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  // Get the breakpoint that drives the mode
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  const breakpointId = await variableMode?.getBreakpoint()
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  if (breakpointId != null) {
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    console.log(`Automatic mode driven by the "${breakpointId}" breakpoint`)
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  } else {
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    console.log("Manual mode")
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  }
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} catch (err) {
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  if (err.cause?.tag === "VariableModeInvalid") {
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    // The mode no longer exists or has been removed
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    console.warn(err.message)
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  } else {
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    throw err
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  }
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}