babel.config.js

module.exports = function (api) {
  api.cache(true)
  return {
    presets: ["babel-preset-expo"],
    plugins: ["./scripts/babel-plugin-transform-bigint-to-jsbi"]
  }
}

index.js

const syntaxBigInt = require("@babel/plugin-syntax-bigint").default

module.exports = function (babel) {
  const types = babel.types

  const visitor = {
    BigIntLiteral(path) {
      const value = path.node.value
      path.replaceWith(
        types.callExpression(types.identifier("BigInt"), [types.StringLiteral(value)])
      )
    }
  }

  return {
    inherits: syntaxBigInt,
    visitor: {
      ...visitor
    }
  }
}

package.json

{
  "name": "babel-plugin-transform-bigint-to-jsbi",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT"
}