exports.getImportSource = function ({
  node
}) {
  if (node.specifiers.length === 0) return node.source.value;
};
exports.getRequireSource = function ({
  node
}) {
  if (node.type !== "ExpressionStatement") return;
  const {
    expression
  } = node;
  if (expression.type === "CallExpression" && expression.callee.type === "Identifier" && expression.callee.name === "require" && expression.arguments.length === 1 && expression.arguments[0].type === "StringLiteral") {
    return expression.arguments[0].value;
  }
};
exports.isPolyfillSource = function (source) {
  return source === "@babel/polyfill" || source === "core-js";
};

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