# `Soundcheck.Check.Refactor.TemplateBoundVariable`
[🔗](https://github.com/leonqadirie/soundcheck/blob/v0.1.0/lib/soundcheck/check/refactor/template_bound_variable.ex#L1)

## Basics

> #### This check is disabled by default. {: .neutral}
>
> [Learn how to enable it](`e:credo:config_file.html#checks`) via `.credo.exs`.

This check has a base priority of `normal` and works with any version of Elixir.

## Explanation

Flags variables a template binds with `<% name = ... %>` and reads
afterwards. LiveView cannot track a template-local variable, so every
expression that reads it re-renders on every change. LiveView warns
only about variables bound outside the template.

Before:

    <% total = Enum.sum(@prices) %>
    <p>Total: {total}</p>

After:

    def mount(_params, _session, socket),
      do: {:ok, assign(socket, prices: prices, total: Enum.sum(prices))}

    <p>Total: {@total}</p>

Variables bound by `:for`, `:let`, and EEx `for`/`case` clauses are
tracked by LiveView and never reported.

Confidence: medium. Tier: syntactic (works without compiling).

## Check-Specific Parameters

Use the following parameters to configure this check:

### `:excluded_paths`

  Paths to skip (atoms, binaries as path segments, or regexes).

*This parameter defaults to* `[~r/\/test\//, "test"]`.

### `:strict`

  Unused.

*This parameter defaults to* `false`.

## General Parameters

Like with all checks, [general params](`e:credo:check_params.html`) can be applied.

Parameters can be configured via the [`.credo.exs` config file](`e:credo:config_file.html`).

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*Consult [api-reference.md](api-reference.md) for complete listing*