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Showing content from https://eslint.org/docs/latest/rules/no-template-curly-in-string below:

no-template-curly-in-string - ESLint - Pluggable JavaScript Linter

Disallow template literal placeholder syntax in regular strings

ECMAScript 6 allows programmers to create strings containing variable or expressions using template literals, instead of string concatenation, by writing expressions like ${variable} between two backtick quotes (`). It can be easy to use the wrong quotes when wanting to use template literals, by writing "${variable}", and end up with the literal value "${variable}" instead of a string containing the value of the injected expressions.

This rule aims to warn when a regular string contains what looks like a template literal placeholder. It will warn when it finds a string containing the template literal placeholder (${something}) that uses either " or ' for the quotes.

Examples of incorrect code for this rule:

"Hello ${name}!";
'Hello ${name}!';
"Time: ${12 * 60 * 60 * 1000}";
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Examples of correct code for this rule:

`Hello ${name}!`;
`Time: ${12 * 60 * 60 * 1000}`;

templateFunction`Hello ${name}`;
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This rule should not be used in ES3/5 environments.

This rule was introduced in ESLint v3.3.0.

• Rule source
• Tests source

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