@linaria/utils/esm/findIdentifiers.js

Blazing fast zero-runtime CSS in JS library

import { getScope } from './getScope';
function isInUnary(path) {
  return path.parentPath?.isUnaryExpression() ?? false;
}

// It's possible for non-strict mode code to have variable deletions.
function isInDelete(path) {
  return path.parentPath.node.operator === 'delete';
}
function isBindingIdentifier(path) {
  return path.isBindingIdentifier() && (!isInUnary(path) || isInDelete(path));
}
function isReferencedIdentifier(path) {
  return path.isReferencedIdentifier() || isInUnary(path) && !isInDelete(path);
}

// For some reasons, `isBindingIdentifier` returns true for identifiers inside unary expressions.
const checkers = {
  any: ex => isBindingIdentifier(ex) || isReferencedIdentifier(ex),
  binding: ex => isBindingIdentifier(ex),
  declaration: ex => isBindingIdentifier(ex) && ex.scope.getBinding(ex.node.name)?.identifier === ex.node,
  reference: ex => isReferencedIdentifier(ex)
};
export function nonType(path) {
  return !path.find(p => p.isTSTypeReference() || p.isTSTypeQuery() || p.isFlowType() || p.isFlowDeclaration() || p.isTSInterfaceDeclaration());
}
export default function findIdentifiers(expressions, type = 'reference') {
  const identifiers = [];
  expressions.forEach(ex => {
    const emit = path => {
      if (!path.node || path.removed || !checkers[type](path)) {
        return;
      }

      // TODO: Is there a better way to check that it's a local variable?

      const binding = getScope(path).getBinding(path.node.name);
      if (!binding) {
        return;
      }
      if (type === 'reference' && ex.isAncestor(binding.path)) {
        // This identifier is declared inside the expression. We don't need it.
        return;
      }
      identifiers.push(path);
    };
    if (ex.isIdentifier() || ex.isJSXIdentifier()) {
      emit(ex);
    } else {
      ex.traverse({
        Identifier(path) {
          emit(path);
        },
        JSXIdentifier(path) {
          emit(path);
        }
      });
    }
  });
  return identifiers;
}
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