/**
* traverse ast nodes.
* @param {AST} ast - target AST.
* @param {function(node: Object, parent: Object)} callback - this is called with each node.
*/
static traverse(ast, callback) {
walker.traverse(ast, {
enterNode: function(node, parent) {
callback.call(this, node, parent);
}
});
}
/**
* find file path in import declaration by name.
* e.g. can find ``./foo/bar.js`` from ``import Bar from './foo/bar.js'`` by ``Bar``.
* @param {AST} ast - target AST.
* @param {string} name - identifier name.
* @returns {string|null} file path.
*/
static findPathInImportDeclaration(ast, name) {
let path = null;
walker.traverse(ast, {
enterNode: function(node) {
if (node.type !== 'ImportDeclaration') return;
for (let spec of node.specifiers) {
let localName = spec.local.name;
if (localName === name) {
path = node.source.value;
return null; // Quit traversal
}
}
}
});
return path;
}