Please don't use if:s to assign boolean literals, just do it:

    const trump_tariff = priceIncrease > 1.0

also saves you from not initializing the variable in the default/other case. :)

This was just someone showing you what the "Amazon programmer" was doing, and hence a deep cut reference to the likelihood of it being poor quality code :)

If you really wanted to look like Amazon codex you would write Java :)

I see I missed an opportunity to make it even funnier.

    const

I feel you may underestimate how often they change.

not to mention the mix of snake_case & camelCase

In the original code, trump_tariff is a sticky value. If that’s intended/not intended, the above introduces/fixes a bug.

If statements are great because they are highly readable.