On 26/06/2020
SPFX webpart query Taxonomy / Term store with @pnp/sp-taxonomy on ie / internet explorer
Your package.json must contains at least :
"@pnp/polyfill-ie11": "1.0.0",
"@pnp/sp": "1.2.7",
"@pnp/sp-clientsvc": "^1.3.9",
"@pnp/sp-taxonomy": "^1.3.9",
"@types/es6-promise": "0.0.33"
In your service where you want to query Term store, you should import :
import 'core-js/modules/es6.string.includes.js';
import 'core-js/modules/es6.number.is-nan.js';
import 'core-js/es6/array';
import 'es6-map/implement';
import { Session } from '@pnp/sp-taxonomy';