ember/template-no-valueless-arguments
April 20, 2026 · View on GitHub
💼 This rule is enabled in the 📋 template-lint-migration config.
Similar to HTML attributes, component arguments will default to an empty string when they are not explicitly assigned a value. This behavior isn't documented anywhere so depending on it isn't recommended and usually the result of a user-error. Since it is valid syntax, accidental use of this behavior can be hard to detect and cause confusing bugs.
Examples
This rule forbids the following:
<template><Editor @defaultText /></template>
<template><SomeComponent @valuelessByAccident{{@canBeAModifier}} /></template>
This rule allows the following:
<template><Editor @defaultText="" /></template>
Migration
Explicitly assign a value to all arguments.