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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable no-invalid-this */
'use strict';
// MODULES //
var logger = require( 'debug' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-object' );
var isUndefined = require( '@stdlib/assert/is-undefined' );
var objectAssignIn = require( '@stdlib/object/assign-in' );
var format = require( '@stdlib/string/format' );
var changeEvent = require( './../change_event.js' );
var prop = require( './properties.js' );
// VARIABLES //
var debug = logger( 'vega:legend:set:'+prop.name );
// MAIN //
/**
* Sets the format specifier for legend labels.
*
* ## Notes
*
* - Providing `undefined` "unsets" the configured value.
*
* @private
* @param {(string|Object|void)} value - input value
* @throws {TypeError} must be a string or object
* @returns {void}
*/
function set( value ) {
var isObj = isObject( value );
// FIXME: validate that an object is a valid TimeMultiFormat object
if ( !isString( value ) && !isObj && !isUndefined( value ) ) {
throw new TypeError( format( 'invalid assignment. `%s` must be a string or a valid format object. Value: `%s`.', prop.name, value ) );
}
// TODO: consider a deep equality check for format objects in order to avoid false positive change events
if ( value !== this[ prop.private ] ) {
debug( 'Current value: %s. New value: %s.', JSON.stringify( this[ prop.private ] ), JSON.stringify( value ) );
this[ prop.private ] = ( isObj ) ? objectAssignIn( {}, value ) : value;
this.emit( 'change', changeEvent( prop.name ) );
}
}
// EXPORTS //
module.exports = set;
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