viem can't be used from CJS modules

[alcuadrado]

viem can't be used in a CJS module. I'd say that this is important for its adoption, as it's the default on node.

If you try to do it you get this error:

pato@lucille:v% node -e 'require("viem")'
node:internal/modules/cjs/loader:1269
      throw err;
      ^

Error [ERR_REQUIRE_ESM]: require() of ES Module /private/tmp/v/node_modules/viem/dist/index.js from /private/tmp/v/[eval] not supported.
Instead change the require of index.js in /private/tmp/v/[eval] to a dynamic import() which is available in all CommonJS modules.
    at [eval]:1:1
    at Script.runInThisContext (node:vm:129:12)
    at Object.runInThisContext (node:vm:307:38)
    at [eval]-wrapper:6:22 {
  code: 'ERR_REQUIRE_ESM'
}

Node.js v18.13.0

I think ideally viem should use package.json#exports to support both ESM and CJS.

[alcuadrado]

Fixed in #37

[github-actions]

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