Playground

<template>
  <div class="vue-input" :class="classes">
      <div class="vue-input__input-wrapper">
          <label> {{ label }} </label>
          <input
              class="vue-input__input"
              value="value"
              @input="$emit('input', $event.target.value)"
          />
      </div>
      <div>
          <slot name="trailing"></slot>
      </div>
  </div>
</template>
<style scoped>
/* ✗ BAD */
.vue-imput, /* It's typo? */
.vue-input__label, /* You may have forgotten to assign a class name. */
.vue-input__input-wrapper > vue-input__input, /* Missing dot. */

/* ✓ GOOD */
.vue-input,
.vue-input__input,
.vue-input > .vue-input__input-wrapper > .vue-input__input,
.vue-input :deep(.child-classes),
.vue-input--disabled {
}
</style>

<script>
export default {
    computed: {
        classes() {
            return {
                "vue-input--disabled": this.disabled,
            }
        },
    },
}
</script>

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