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Version: 4.2

From v3 to v4

In this document you can find the migration guide from the previous version v3 to v4.

Exported enum LasPriceAnimationMode has been removed​

Please use LastPriceAnimationMode instead.

scaleMargins option has been removed from series options​

Previously, you could do something like the following:

const series = chart.addLineSeries({
    scaleMargins: { /* options here */},
});

And scaleMargins option was applied to series' price scale as scaleMargins option.

Since v4 this option won't be applied to the price scale and will be just ignored (if you're using TypeScript you will get a compilation error).

To fix this, you need to apply these options to series' price scale:

const series = chart.addLineSeries();

series.priceScale().applyOptions({
    scaleMargins: { /* options here */},
});

backgroundColor from layout options has been removed​

If you want to have solid background color you need to use background property instead, e.g. instead of:

const chart = createChart({
    layout: {
        backgroundColor: 'red',
    },
});

use

const chart = createChart({
    layout: {
        background: {
            type: ColorType.Solid,
            color: 'red',
        },
    },
});

overlay property of series options has been removed​

Please follow the guide for migrating from v2 to v3 where this option was deprecated.

priceScale option has been removed​

Please follow the guide for migrating from v2 to v3.

priceScale() method of chart API now requires to provide price scale id​

Before v4 you could write the following code:

const priceScale = chart.priceScale();

And in priceScale you had a right price scale if it is visible and a left price scale otherwise.

Since v4 you have to provide an ID of price scale explicitly, e.g. if you want to get a right price scale you need to provide 'right':

const rightPriceScale = chart.priceScale('right');
const leftPriceScale = chart.priceScale('left');

drawTicks from leftPriceScale and rightPriceScale options has been renamed to ticksVisible​

Since v4 you have to use ticksVisible instead of drawTicks.

const chart = createChart({
    leftPriceScale: {
        ticksVisible: false,
    },
    rightPriceScale: {
        ticksVisible: false,
    },
});

Also this option is off by default.

The type of outbound time values has been changed​

Affected API:

Previously the type of an inbound time (a values you provide to the library, e.g. in ISeriesApi.setData) was different from an outbound one (a values the library provides to your code, e.g. an argument of LocalizationOptions.timeFormatter). So the difference between types was that outbound time couldn't be a business day string.

Since v4 we improved our API in this matter and now the library will return exactly the same values back for all time-related properties.

Thus, if you provide a string to your series in ISeriesApi.setData, you'll receive exactly the same value back:

series.setData([
    { time: '2001-01-01', value: 1 },
]);

chart.applyOptions({
    localization: {
        timeFormatter: time => time, // will be '2001-01-01' for the bar above
    },
    timeScale: {
        tickMarkFormatter: time => time, // will be '2001-01-01' for the bar above
    },
});

chart.subscribeCrosshairMove(param => {
    console.log(param.time); // will be '2001-01-01' if you hover the bar above
});

chart.subscribeClick(param => {
    console.log(param.time); // will be '2001-01-01' if you click on the bar above
});

Handling this breaking change depends on your needs and your handlers, but generally speaking you need to convert provided time to a desired format manually if it is required. For example, you could use provided helpers to check the type of a time:

import {
    createChart,
    isUTCTimestamp,
    isBusinessDay,
} from 'lightweight-charts';

const chart = createChart(document.body);

chart.subscribeClick(param => {
    if (param.time === undefined) {
        // the time is undefined, i.e. there is no any data point where a time could be received from
        return;
    }

    if (isUTCTimestamp(param.time)) {
        // param.time is UTCTimestamp
    } else if (isBusinessDay(param.time)) {
        // param.time is a BusinessDay object
    } else {
        // param.time is a business day string in ISO format, e.g. `'2010-01-01'`
    }
});

seriesPrices property from MouseEventParams has been removed​

Affected API:

The property seriesPrices of MouseEventParams has been removed.

Instead, you can use MouseEventParams.seriesData - it is pretty similar to the old seriesPrices, but it contains series' data items instead of just prices:

lineSeries.setData([{ time: '2001-01-01', value: 1 }]);
barSeries.setData([{ time: '2001-01-01', open: 5, high: 10, low: 1, close: 7 }]);

chart.subscribeCrosshairMove(param => {
    console.log(param.seriesData.get(lineSeries)); // { time: '2001-01-01', value: 1 } or undefined
    console.log(param.seriesData.get(barSeries)); // { time: '2001-01-01', open: 5, high: 10, low: 1, close: 7 } or undefined
});

MouseEventParams field hoveredMarkerId was renamed to hoveredObjectId​

Since v4 you have to use hoveredObjectId instead of hoveredMarkerId.

chart.subscribeCrosshairMove(param => {
    console.log(param.hoveredObjectId);
});

chart.subscribeClick(param => {
    console.log(param.hoveredObjectId);
});