Probably not a good idea: normalize array of objects in Craft

getnews.twig

{# variables #}
{% set allNews = [] %}
{% set today = "now"|date("Y-m-d") %}

{# create custom allNews array of objects #}
{% set news = craft.entries()
  .section(["news"])
  .with([
    "newsImage"
  ])
  .orderBy("postDate DESC")
  .limit(8)
  .all() %}
{% for item in news %}
  {% set thumbSmall = item.newsImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.newsImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.postDate|date("Y-m-d"),
    sortDate: item.postDate|date("U"),
    typeFormatted: "News",
    cssClass: "c-news--news"
  }]) %}
{% endfor %}
{% set events = craft.entries()
  .section(["events"])
  .with([
    "eventsImage"
  ])
  .orderBy("eventStartDate DESC")
  .eventEndDate(['and', ">= #{today}"])
  .limit(8)
  .all() %}
{% for item in events %}
  {% set thumbSmall = item.eventImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.eventImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.eventStartDate|date("Y-m-d"),
    sortDate: item.eventStartDate|date("U"),
    typeFormatted: "Event",
    cssClass: "c-news--event"
  }]) %}
{% endfor %}
{% set videos = craft.entries()
  .section(["videos"])
  .with([
    "videoImage"
  ])
  .orderBy("postDate DESC")
  .limit(8)
  .all() %}
{% for item in videos %}
  {% set thumbSmall = item.eventImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.eventImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.postDate|date("Y-m-d"),
    sortDate: item.postDate|date("U"),
    typeFormatted: "Vidéo",
    cssClass: "c-news--video"
  }]) %}
{% endfor %}

{# sort and slice #}
{% set allNews = allNews|sort((a, b) => a.sortDate < b.sortDate) %}
{% set allNews = allNews|slice(0,8) %}

{# display (@TODO: replace by a component using custom objects) #}
{% for item in allNews %}
  <p>{{ item.displayDate }} - {{ item.typeFormatted }} - {{ item.title }}</p>
{% endfor %}

Nice. That definitely tightens things up even more. Thanks for sharing @jeromecoupe!