Encountering a JavaScript error in Angular 2: "TypeError: undefined is not a function when

I encountered an issue with my Angular 2 project that was created using angular-cli version 1.0.0-beta.30 and utilizing the ngx-charts version 4.1.2 library. The bar chart component functions properly, however, when I tried to add a line chart, I faced a TypeError exception upon running the application. This error specifically points to the "includes" function in line 240 of the [line-chart.component.ts][1] source file while using Chrome version 38. Interestingly, the line chart displays correctly in Firefox.

if (!values.includes(d.name)) {
    values.push(d.name);
}

I am seeking guidance on how to make the array include function recognized within my application.

In my tsconfig.json file, I have specified:

"lib": ["es6", "dom"],

The package.json file includes:

{
  "name": "dashboards",
  "version": "0.0.0",
  "license": "MIT",
  // other dependencies...
}

The polyfills.ts file contains:

import 'core-js/es6/array';

Despite referring to the ngx-charts demo and other examples, I haven't been able to pinpoint the reason behind this error.

Appreciate any help or insight on this matter.

javascriptangulartypescriptchartstsconfig

Answer №1

After some investigation, I identified the issue. The polyfills.ts file was originally set up with the following code:

import 'core-js/es6/array';

To resolve the issue, I made a modification and added the following line of code:

import 'core-js/es7/array';

The changes in my code were necessary due to compatibility issues with the version of Chrome on my work computer, which is currently running version 38. According to the documentation on developer.mozilla.org, support for Array.includes in Chrome starts at version 47.

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