Sharepoint Online Missing Icons

SPFX react sur Internet explorer : [SPLoaderError.loadComponentError]: There was a network problem. This may be a problem with a HTTPS certificate. Make sure you have the right certificate.

It's not always à certificate error, in my case, i use code below in a service,

import 'core-js/modules/es6.string.includes.js';//in my case this line should be commented to fix the isssue
import 'core-js/modules/es6.number.is-nan.js';
import 'core-js/es6/array';
import 'es6-map/implement';

when including "@types/es6-promise": "^3.3.0" i don't need anymore import 'core-js/modules/es6.string.includes.js

Override native css

:global(#spLeftNav) {  
  display: none;
} 
:global(.CanvasZone) {  
  max-width: 100%;
} 

Is member of

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 { sp,SPRest } from '@pnp/sp';
import { IWebPartContext } from '@microsoft/sp-webpart-base';
import * as React from 'react';

class PeopleService {
    private _context: IWebPartContext;
    private _localPnPSetup: SPRest;

    public constructor(webPartContext: IWebPartContext) {
        this._context = webPartContext;

        // To limit the payload size, we set odata=nometadata
        // We just need to get list items here
        // We use a local configuration to avoid conflicts with other Web Parts
        this._localPnPSetup = sp.configure({
            headers: {
                Accept: 'application/json; odata=nometadata',
            },
        }, this._context.pageContext.web.absoluteUrl);
    }

    public async isMemberOf(group: string): Promise{
        let groups = await this._localPnPSetup.web.currentUser.groups.get();
        let ret: boolean = false;
        
        groups.map(grp =>{
            if(grp.LoginName == group)
            ret =  true;
        });
        return ret;
    }

    public async isMemberOfanyGroup(groupNames: string[]): Promise{
        let groups = await this._localPnPSetup.web.currentUser.groups.get();
        let ret: boolean = false;
        groups.map(grp =>{
            groupNames.map(name =>{
                console.log("name : '" + name + "' grp : '" + grp.LoginName  + "'");
            if(grp.LoginName == name)
                ret = true;
            });
        });
        return ret;
    }

}
export default PeopleService;

Taxonomy, get tags, add tags

import { IWebPartContext } from '@microsoft/sp-webpart-base';
import { Session, ITermStore, ITermSet, ITermData, ITerm } from '@pnp/sp-taxonomy';

class TaxonomyService {
    private _context: IWebPartContext;
    
    public constructor(webPartContext: IWebPartContext) {
        this._context = webPartContext;
    }

    public async getTags() : Promise{
        
        console.log("Session");
        const taxonomy = new Session(this._context.pageContext.site.absoluteUrl);
        const store: any = taxonomy.termStores.getByName("Taxonomy_Wf8XzHaRobdAERjvvke+Tg==");
        let datas = await store.getTermSetById("c18ff3e6-e4a8-4dcb-85f5-51171f4bbc11").terms.select('Name', 'Id', 'Parent').get();
        
        let ret: string[] = [];
        for(let i = 0 ; i < datas.length ; i++)
            ret.push(datas[i]);

        return datas;
    }
    
    public async addNewTag(tag){
        
        const taxonomy = new Session(this._context.pageContext.site.absoluteUrl);
        const store: any = taxonomy.termStores.getByName("Taxonomy_Wf8XzHaRobdAERjvvke+Tg==");
        let datas = await store.getTermSetById("c18ff3e6-e4a8-4dcb-85f5-51171f4bbc11");
        const term: ITerm & ITermData = await datas.addTerm(tag, 1036, true);
    }
}
export default TaxonomyService;