ast-is-empty^4.0.3

Installation

1. Install the latest version with yarn:

yarn add ast-is-empty

or with npm:

npm install ast-is-empty

2. Import it in your code:

import { isEmpty, version } from "ast-is-empty";

Quick Take

import { strict as assert } from "assert";

import { isEmpty } from "ast-is-empty";

assert.equal(
  isEmpty({
    a: "",
  }),
  true
);

assert.equal(
  isEmpty({
    a: [""],
    b: {
      c: {
        d: "",
      },
    },
  }),
  true
);

assert.equal(
  isEmpty([
    {
      a: [""],
      b: { c: { d: "" } },
    },
    "",
    ["", "", ""],
  ]),
  true
);

Purpose

Sometimes we need to check, does given AST contain only empty structures:

• empty strings (those that trim to zero length)
• arrays containing zero or more keys containing empty structures
• plain objects with containing zero or more keys containing empty structures

This program helps with that.

API — isEmpty()

The main function isEmpty() is imported like this:

import { isEmpty } from "ast-is-empty";

It’s a function which takes one input arguments, of any type:

function isEmpty (input: any): boolean | null;

It returns boolean or null (in case of non-AST structure, like a function).

API — version

You can import version:

import { version } from "ast-is-empty";
console.log(version);
// => "4.0.3"

Changelog