Determine whether an AST node is a reference
npm install is-referenceUtility for determining whether an AST node is a reference.
foo is a reference in these cases:
``js`
console.log(foo);
var foo;
function foo() {}
function bar(foo) {}
export { foo as x };
foo is not a reference in these cases:
`js`
var obj = { foo: 1 };
console.log(obj.foo);
export { x as foo };
In all cases, foo is an Identifier node, but the two kinds must be treated differently for the purposes of scope analysis etc. (The examples are non-exhaustive.)
`bash`
npm install is-reference
Example using Acorn and estree-walker:
`js
import { parse } from 'acorn';
import { walk } from 'estree-walker';
import is_reference from 'is-reference';
const identifiers = [];
const references = [];
const ast = parse(var a = b.c;);
walk(ast, {
enter(node, parent) {
if (node.type === 'Identifier') identifiers.push(node);
if (is_reference(node, parent)) references.push(node);
}
});
identifiers.forEach(node => console.log(node.name)); // a, b, c
references.forEach(node => console.log(node.name)); // a, b
``
MIT