A look at the main visitor of grandmas-own-jsx

grandma-visitor.js

module.exports = function ({ types: t }) {
  const GrandmaVisitor = {
    StringLiteral(path, state) {
      if (path.node.value === "👵") {
        const recipeRef = state.grandmasRecipes[path.node.loc.start.line];
        const recipeMatches = recipeRef && recipeRef.start > path.node.start;
        if (recipeMatches) {
          const recipe = recipeRef.value;
          const domStruc = cookRecipe(recipe, state.grandmasReference);

          const typeExpression = genTypeExpression(domStruc);

          path.replaceWith(typeExpression);
        }
      }
    },
  };
  
  const GrandmaVisitorInitiator = { /* ... */ };

  return { visitor: GrandmaVisitorInitiator };
};