1.2 KiB
1.2 KiB
is-reference
Utility for determining whether an AST node is a reference.
foo is a reference in these cases:
console.log( foo );
var foo;
function foo () {}
function bar ( foo ) {}
export { foo as x };
foo is not a reference in these cases:
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.)
Installation
npm install is-reference
Usage
Example using Acorn and estree-walker:
const { parse } = require( 'acorn' );
const { walk } = require( 'estree-walker' );
const isReference = require( '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 ( isReference( node, parent ) ) references.push( node );
}
});
identifiers.forEach( node => console.log( node.name ) ); // a, b, c
references.forEach( node => console.log( node.name ) ); // a, b
License
MIT