Function visitor

src/transform.ts:109–126

  hoistedVariables: ts.VariableStatement[]
): ts.Visitor {
  const visitor: ts.Visitor = node => {
    if (isConstantElement(node)) {
      const variable = ts.createUniqueName("hoisted_constant_element");
      const statement = ts.createVariableStatement(
        undefined,
        ts.createVariableDeclarationList([
          ts.createVariableDeclaration(variable, undefined, node)
        ])
      );
      // Store the variable assignement to hoist later
      hoistedVariables.push(statement);

      // Replace <foo /> with {hoisted_constant_element_1}
      // TODO: Figure out case like `return <foo />
      return ts.createJsxExpression(undefined, variable);
    }
    return ts.visitEachChild(node, visitor, ctx);
  };
  return visitor;
}