Is there a plan to support inserting declaration statements?

[imguolao]

Describe the feature

expect

Insert a new statement before (or after) a statement.

import { parseModule, generateCode } from "magicast";

// Parse to AST
const mod = parseModule(`export default { }`);

// Insert a declaration statement before the `export default` statement
mod.exports.before(`const a = "VariableDeclarator";`);

// Ensure foo is an array
mod.exports.default.foo ||= [];

// Add a variable as a new array member
mod.exports.default.foo.push("a", "var");

/**
 * const a = "VariableDeclarator";
 * export default {
 *   foo: [a],
 * };
 */
console.log(generateCode(mod).code);

Additional information

• [X] Would you be willing to help implement this feature?

[antfu]

Sounds reasonable. I think we could use $append and $prepend on every node? Prefix with $ indicates it's a special operation and avoids conflicts with the namespace.