json-stable-stringify/test/replacer.js

deterministic JSON.stringify() with custom sorting to get deterministic hashes from stringified results

'use strict';

var test = require('tape');
var stringify = require('../');

test('replace root', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: false };
	var replacer = function () { return 'one'; };

	t.equal(stringify(obj, { replacer: replacer }), '"one"');
});

test('replace numbers', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: false };
	/** @type {import('..').StableStringifyOptions['replacer']} */
	var replacer = function (_key, value) {
		if (value === 1) { return 'one'; }
		if (value === 2) { return 'two'; }
		return value;
	};

	t.equal(stringify(obj, { replacer: replacer }), '{"a":"one","b":"two","c":false}');
});

test('replace with object', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: false };
	/** @type {import('..').StableStringifyOptions['replacer']} */
	var replacer = function (key, value) {
		if (key === 'b') { return { d: 1 }; }
		if (value === 1) { return 'one'; }
		return value;
	};

	t.equal(stringify(obj, { replacer: replacer }), '{"a":"one","b":{"d":"one"},"c":false}');
});

test('replace with undefined', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: false };
	/** @type {import('..').StableStringifyOptions['replacer']} */
	var replacer = function (_key, value) {
		if (value === false) { return; }
		return value;
	};

	t.equal(stringify(obj, { replacer: replacer }), '{"a":1,"b":2}');
});

test('replace with array', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: false };
	/** @type {import('..').StableStringifyOptions['replacer']} */
	var replacer = function (key, value) {
		if (key === 'b') { return ['one', 'two']; }
		return value;
	};

	t.equal(stringify(obj, { replacer: replacer }), '{"a":1,"b":["one","two"],"c":false}');
});

test('replace array item', function (t) {
	t.plan(1);

	var obj = { a: 1, b: 2, c: [1, 2] };
	/** @type {import('..').StableStringifyOptions['replacer']} */
	var replacer = function (_key, value) {
		if (value === 1) { return 'one'; }
		if (value === 2) { return 'two'; }
		return value;
	};

	t.equal(stringify(obj, { replacer: replacer }), '{"a":"one","b":"two","c":["one","two"]}');
});