Why is it that even though TypeScript claims to be a strict superset of JavaScript, I'm unable to import an external library without needing a corresponding d.ts file for it to function properly? Shouldn't I be able to use the plain JavaScript library directly without having to worry about type checking?
There is no strict requirement for you to declare external libraries in TypeScript. You have the flexibility to use them without formal declarations.
The fundamental purpose of TypeScript is to prevent errors caused by typos and incorrect type assignments. If you choose to utilize external modules without any type information, then the essence of TypeScript may be lost.
Additionally, you can circumvent the necessity for declarations by employing the following syntax:
const module = require('module');
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