Tween a value and dynamically update the DOM with Svelte 3

• Tween is a svelte function that dynamically updates values of variables from an initial value to a new value.

• import {tweened} from "svelte/motion"

• tweened is uesd like this:

    const progress = tweened(0, {
      duration: 2000,
      easing: bounceInOut
    })

• The first value (in this case 0) is the initial value to set the variable to, the second value is an object with some parameters for the animation - namely the duration in milliseconds it will take to reach the final value, and an easing function if you want the variable to update non-linearly.

• If you want to learn more, here is the Svelte Tutorial on tweened.

Create a new Svelte project with TypeScript support

• Svelte has support for Typescript.
• To create a new Svelte project with typescript support, first run npx degit sveltejs/template my-svelte-plus-typescript-project
• To setup Typescript just run node scripts/setupTypeScript.js this will convert this template into a Typescript project
• You can install dependencies with yarn/npm
• If you explore the repository we'll see that the script tags have the attribute lang="ts" which shows that typescript is supported.
• npx svelte-check is a command that will check your entire codebase for any type related issues.

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