TypeScript show errors when running `tsc` but not from VS Code [duplicate]

Question

I get this error when running tsc

But when I open the file in VS Code, I don't get any error. Here's the code

    const validWorkAddresses = workAddresses.filter((item) => !!item)
    try {
      const response = await triggerCreateRoute({
        year,
        createRouteInput: {
          homeAddress,
          workAddresses: validWorkAddresses,
          selectedRoute,
          overrideRoundtripDistanceKm,
          suggestionId: routeData.suggestionId,
          routeId,
        },
      }).unwrap()
      setIsShowingEditDialog(false)
      handleRouteResponse(response, 'DUPLICATE')
    } catch (e) {}

workAddresses is of type DawaAddress | undefined)[] and updateRouteInput.workAddresses is of type DawaAddress[]

VS Code seems to understand that by running const validWorkAddresses = workAddresses.filter((item) => !!item) the list will not contain undefined elements.

Can I tweak tsc to get it?

inverse: stackoverflow.com/q/75461919/11107541. but the title sounds like a duplicate of stackoverflow.com/q/60803223/11107541 — starball
– starball ♦, Commented Mar 29 at 11:00

Michael Lorton · Accepted Answer · 2025-03-25 21:41:19Z

0

You could certainly do the following:

workAddresses.filter((item): item is DawaAddress => !!item)

Why it is not happening automatically with your tsc I do not know.

answered Mar 25 at 21:41

Michael Lorton

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