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In chartJS v2.x you must specify what axis you want to access (as they now support multiple). For your issue, you want to use the default y axis, which should be accessible in such a manner
this.chart.scales["y-axis-0"]
Although I haven’t tested it myself, I think endPoint is now called bottom, and therefore you can get the same value like this:
this.chart.scales["y-axis-0"].bottom
Source:stackexchange.com