@dr.pogodin/babel-plugin-react-css-modules/dist/handleSpreadClassName.js

Transforms styleName to className using compile time CSS module resolution.

import { NodePath } from '@babel/traverse';
import { cloneNode,
// type Expression,
isStringLiteral, isJSXExpressionContainer, jsxExpressionContainer, binaryExpression, stringLiteral } from '@babel/types';
const handleSpreadClassName = (path, destinationName, classNamesFromSpread // TODO: It should be Expression type from '@babel/types', but I am not sure now, how to express it for flow.
) => {
  const destinationAttribute = path.node.openingElement.attributes.find(attribute => typeof attribute.name !== 'undefined' && attribute.name.name === destinationName);
  if (!destinationAttribute) {
    return;
  }
  if (isStringLiteral(destinationAttribute.value)) {
    destinationAttribute.value = jsxExpressionContainer(binaryExpression('+', cloneNode(destinationAttribute.value), binaryExpression('+', stringLiteral(' '), classNamesFromSpread)));
  } else if (isJSXExpressionContainer(destinationAttribute.value)) {
    destinationAttribute.value = jsxExpressionContainer(binaryExpression('+', cloneNode(destinationAttribute.value.expression), binaryExpression('+', stringLiteral(' '), classNamesFromSpread)));
  }
};
export default handleSpreadClassName;
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