fix: split validators.ts into multiple files to allow proper tree shaking

[gempain]

In validators.ts, line 20-22:

private libPhoneNumber = {
    phoneUtil: require("google-libphonenumber").PhoneNumberUtil.getInstance(),
};

When class-validator is bundled with webpack, google-libphonenumber, which represents 71% of the bundle size, is embedded, even if you don't use the phone number validator. See this bundle analysis made with webpack-bundle-analyzer:

Validators should be split into different files, allowing to import only the needed files without extra code and thus enabling proper tree shaking when bundling dependencies with webpack.

[Larsrdev]

here some older PR and more to read: #258

[gempain]

@Larsrdev right ! Weird, I thought I had searched properly before even taking the time to investigate. Anyways, closing in favor of #258. Sorry for the noise 😄

[lock]

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