JavaScript Equivalent of Declaration in TypeScript

In my Next JS application, I encountered a situation where a line of code relies on a variable from a script src in the app.tsx page. Here's how it looks:

app.tsx:

<script src="https://js.stripe.com/v3/"></script>

config.ts:

declare var Stripe:any
const stripe = Stripe("stripe publishable key")

This setup works because TypeScript doesn't recognize the 'Stripe' variable, but during build time, it's fetched from the script and can be initialized. The 'declare' statement helps to avoid errors without assigning an initial value to the variable. However, when the TypeScript is compiled to JavaScript using 'npm run build', the 'declare' statement disappears, leading to an error before completing the build process. So, I'm curious if there are alternative methods similar to 'declare' or perhaps better ways to import the script to bypass this issue?

Answer №1

This solution works effectively because the use of the "any" type encompasses function types. TypeScript is instrumental in catching errors before compilation, serving as a helpful tool for developers during the coding process. The error encountered stemmed from attempting to execute an undefined variable, specifically with Stripe. Since undefined variables cannot be executed, running the code triggered an error. This issue was not related to TypeScript but rather to build tools not being able to detect the problem. To rectify this issue, the correct approach is as follows:

declare var Stripe: (value: string) => {...}
const stripe = Stripe("stripe publishable key")

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