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perform runFn(fn: (arg: quantity) => any, worth: quantity): any {
return fn(worth);
}
runFn would settle for a perform that takes a single quantity as an argument and returns any worth. runFn would absorb such a perform, plus a quantity worth, after which execute that perform with the worth.
Word that right here we use the arrow notation to point what the handed perform returns, not a colon as we do the primary perform signature.
Constructing a TypeScript undertaking
Many construct instruments within the JavaScript ecosystem are actually TypeScript-aware. As an example, the frameworks tsdx, Angular, and Nest all know how you can mechanically flip a TypeScript codebase into its matching JavaScript code with little intervention in your half.
In case you’re working with a construct device like Babel or webpack (among others), these instruments may also deal with TypeScript initiatives, so long as you put in TypeScript dealing with as an extension or allow it manually. As an example, with webpack, you’d set up the ts-loader bundle by npm, after which set up a webpack.config.js file to incorporate your .ts information.
The important thing to transferring an present JavaScript undertaking to TypeScript is to method it a step at a time—migrate one module at a time, then one perform at a time. As a result of TypeScript can coexist with common JavaScript, you aren’t obliged emigrate all the things directly, and you may take the time to experiment with figuring out the best types to use across your project’s codebase.
