is-reference

3.0.3last stable release 2 months ago
Complexity Score
Low
Open Issues
N/A
Dependent Projects
219
Weekly Downloadsglobal
6,270,726

License

  • MIT
    • Yesattribution
    • Permissivelinking
    • Permissivedistribution
    • Permissivemodification
    • Nopatent grant
    • Yesprivate use
    • Permissivesublicensing
    • Notrademark grant

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Readme

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:

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

License

MIT

Dependencies

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0
Scorecards Score
3.90
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Follows Semver
Yes
Github Stars
24
Dependenciestotal
8
DependenciesOutdated
0
DependenciesDeprecated
0
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