Challenging Issue: "The 'any' type cannot be assigned to the 'never' type"

Currently facing a challenging Typescript problem that has me puzzled.

The issue arises at the line

themeToChange[tileId][key] = value;

The error message states

Type 'any' is not assignable to type 'never'

This error is directly related to the introduction of the TileLayout type. I'm having difficulty pinpointing the mistake. Interestingly, adding the value "None" to the TileLayout type resolves the error.

const changeSetting = React.useCallback(
    (key: keyof TileSettings, value: ValueOfTileSettings, tileId: TileId) => {
      const userSettings = JSON.parse(JSON.stringify(settings)) as UserSettings;
      const themeToChange = getCurrentTheme(userSettings, colorMode);

      themeToChange[tileId][key] = value;

      setSettings(userSettings);
    },
    [colorMode, setSettings, settings]
  );

Provided below are the type definitions:


export type TileLayout = "STANDARD" | "COMPACT";

export type TileType =
  | "Reddit Feed"
  | ...
  | "RSS Feed Tile"
  | "None";

export type TileSettings = { ... };

export type ThemeSettings = { ... };

Any assistance on this matter would be greatly appreciated! :)

Answer №1

Retrieve the primary value in a generic type and apply it for inferring the type of value. Such as:

<K extends keyof TileSettings>(mainValue: K, value: TileSettings[K], tileId: TileId)

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