How to Import Luxon and Adapter in LWC?

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Question:

How to Import Luxon and Chart.js Luxon Adapter as Static Resources in an LWC Component?

I am trying to integrate Luxon and the Chart.js Luxon adapter as static resources in my Lightning Web Component (LWC) child component. I previously had only Chart.js, and it worked fine. However, after adding Luxon and its adapter, I encounter errors when attempting to load them.

Here’s what I’ve done so far:

Downloaded Chart.js from Chart.js CDN and uploaded it as a static resource.
Downloaded the minified Luxon library from Luxon installation guide. I’m unsure whether to use the “Basic browser setup” or “ES6” file (I tried both) and uploaded it as a static resource.
Downloaded the Chart.js Luxon adapter from its GitHub repository (Chart.js Luxon Adapter) and uploaded the file from this link: Adapter CDN as a static resource.

Here’s my updated LWC JavaScript code:

import { LightningElement, api } from 'lwc';
import { loadScript } from 'lightning/platformResourceLoader';
import chartjs from '@salesforce/resourceUrl/ChartJs';
import adapter from '@salesforce/resourceUrl/LuxonAdapter';
import luxon from '@salesforce/resourceUrl/LuxonDateTime';

export default class GenericChart extends LightningElement {
    @api chartConfig;
    chart;
    isChartInitialized;

    renderedCallback() {
        this.loadScripts();
    }

    async loadScripts() {
        await loadScript(this, chartjs)
            .catch(error => console.error('Error loading Chart.js:', error));
        await loadScript(this, luxon)
            .catch(error => console.error('Error loading Luxon Date Time:', error));
        await loadScript(this, adapter)
            .then(() => this.initializeChart())
            .catch(error => console.error('Error loading Luxon adapter:', error));
        this.isChartInitialized = true;
    }

    initializeChart() {
        const ctx = this.template.querySelector('canvas.linechart').getContext('2d');
        this.chart = new window.Chart(ctx, JSON.parse(JSON.stringify(this.chartConfig)));
    }
}

When trying to import Luxon and the Luxon adapter as static resources in a Lightning Web Component (LWC), you may encounter issues loading the Luxon library and its corresponding adapter. The Luxon library works well out of the box for the “Basic browser setup” version, but the Luxon Chart.js adapter (especially the minified version) can cause issues in LWC. The main problem arises because the developers of the Luxon Chart.js adapter provide JavaScript with import statements, which is not suitable for LWC due to its module-based system. Additionally, the minified version of the adapter can be cumbersome to debug.

Solution

One effective approach is to take the adapter from the repository, modify it slightly, and then incorporate it into your LWC component. Here’s how you can do that:

Create Static Resources for Luxon and Adapter: First, upload both the Luxon library and the Luxon Chart.js adapter as static resources in Salesforce.
Import the Static Resources in Your LWC: Use the loadScript method to load the Luxon library, the Chart.js library, and the Luxon adapter in your component.
Modify the Adapter: The adapter may require some adjustments, particularly around how it interacts with the Luxon library and Chart.js within the LWC environment. Below is an example of how you can modify and use the adapter:

import { loadScript } from 'lightning/platformResourceLoader';
import chartjs from '@salesforce/resourceUrl/ChartJs';
import luxon from '@salesforce/resourceUrl/LuxonDateTime';
import adapter from '@salesforce/resourceUrl/LuxonAdapter';

export default class GenericChart extends LightningElement {
    @api chartConfig;
    chart;
    isChartInitialized;

    renderedCallback() {
        this.loadScripts();
    }

    async loadScripts() {
        await loadScript(this, chartjs);
        await loadScript(this, luxon);
        await this.initializeAdapter();
        await this.initializeChart();
        this.isChartInitialized = true;
    }

    async initializeAdapter() {
        const DateTime = window.luxon.DateTime;

        const FORMATS = {
            datetime: DateTime.DATETIME_MED_WITH_SECONDS,
            millisecond: 'h:mm:ss.SSS a',
            second: DateTime.TIME_WITH_SECONDS,
            minute: DateTime.TIME_SIMPLE,
            hour: {hour: 'numeric'},
            day: {day: 'numeric', month: 'short'},
            week: 'DD',
            month: {month: 'short', year: 'numeric'},
            quarter: "'Q'q - yyyy",
            year: {year: 'numeric'}
        };

        window.Chart._adapters._date.override({
            _id: 'luxon',
            _create: function(time) {
                return DateTime.fromMillis(time, this.options);
            },
            init(chartOptions) {
                if (!this.options.locale) {
                    this.options.locale = chartOptions.locale;
                }
            },
            formats() {
                return FORMATS;
            },
            parse(value, format) {
                const options = this.options;
                const type = typeof value;
                if (value === null || type === 'undefined') {
                    return null;
                }

                if (type === 'number') {
                    value = this._create(value);
                } else if (type === 'string') {
                    if (typeof format === 'string') {
                        value = DateTime.fromFormat(value, format, options);
                    } else {
                        value = DateTime.fromISO(value, options);
                    }
                } else if (value instanceof Date) {
                    value = DateTime.fromJSDate(value, options);
                } else if (type === 'object' && !(value instanceof DateTime)) {
                    value = DateTime.fromObject(value, options);
                }

                return value.isValid ? value.valueOf() : null;
            },
            format(time, format) {
                const datetime = this._create(time);
                return typeof format === 'string'
                    ? datetime.toFormat(format)
                    : datetime.toLocaleString(format);
            },
            add(time, amount, unit) {
                const args = {};
                args[unit] = amount;
                return this._create(time).plus(args).valueOf();
            },
            diff(max, min, unit) {
                return this._create(max).diff(this._create(min)).as(unit).valueOf();
            },
            startOf(time, unit, weekday) {
                if (unit === 'isoWeek') {
                    weekday = Math.trunc(Math.min(Math.max(0, weekday), 6));
                    const dateTime = this._create(time);
                    return dateTime.minus({days: (dateTime.weekday - weekday + 7) % 7}).startOf('day').valueOf();
                }
                return unit ? this._create(time).startOf(unit).valueOf() : time;
            },
            endOf(time, unit) {
                return this._create(time).endOf(unit).valueOf();
            }
        });
    }

    initializeChart() {
        const ctx = this.template.querySelector('canvas.linechart').getContext('2d');
        this.chart = new window.Chart(ctx, JSON.parse(JSON.stringify(this.chartConfig)));
    }
}

Explanation

Loading Luxon and Chart.js: We load the Luxon and Chart.js libraries using loadScript and import them as static resources.
Modifying the Luxon Adapter: We override Chart.js’s date adapter to use Luxon’s DateTime class for handling dates and times. This allows Chart.js to utilize Luxon for formatting and parsing date-time values.
Custom Formats: Custom date-time formats are defined within the adapter. These formats are available for use in the chart.
Handling Date Operations: The adapter also includes methods for date parsing, formatting, adding/subtracting time, and calculating differences.

Final Thoughts

By modifying the adapter, you can tailor it to your needs and ensure compatibility with LWC. This solution eliminates the need for debugging minified JavaScript and allows for greater flexibility when working with Luxon and Chart.js in Salesforce Lightning Web Components.

Summing Up

To import Luxon and the Luxon Chart.js adapter as static resources in a Lightning Web Component (LWC), you need to follow these steps:

Upload Luxon and Adapter as Static Resources: Upload both Luxon and its Chart.js adapter as static resources in Salesforce.
Import and Load Scripts: Use the loadScript function in LWC to load both the Luxon library and the Chart.js adapter.
Modify the Adapter: Since the minified version of the Luxon adapter may cause issues, you can modify the adapter to make it work seamlessly within LWC. This includes adapting date parsing, formatting, and handling operations to use Luxon’s DateTime class.
Initialize the Adapter and Chart: Once the scripts are loaded, you initialize the Luxon adapter and use it to format and manage date-time values in your charts.

This solution eliminates the debugging complexity of the minified version and offers flexibility for further customization in LWC.

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