# static template

## `CommonError.template`

A template of the error message of [`string`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) type with the replaceable [`{problem}`](https://error.angular-package.dev/constructor#problem), [`{fix}`](https://error.angular-package.dev/constructor#fix) and optional [`{id}`](#id), [`{link}`](#link), [`{max}`](#max), [`{min}`](#min), [`{type}`](#type) tags.

{% hint style="info" %}
By default, it's set to:

`Problem{id}: {problem} => Fix: {fix}`.
{% endhint %}

{% code title="common-error.class.ts" %}

```typescript
public static template = `Problem{id}: {problem} => Fix: {fix}`;
```

{% endcode %}

### Tags

Replaceable tags on the [`template`](#template-string-commonerror.template).

#### `{fix}`

Replaceable by the given required [`fix`](https://error.angular-package.dev/constructor#fix-string) parameter.

#### `{id}`

Replaceable by the given [`id`](https://error.angular-package.dev/constructor#id-id) parameter.

#### `{link}`

Replaceable by the property `link` of the given [`additional`](https://error.angular-package.dev/constructor#additional-min-number-max-number-type-string) parameter.

#### `{max}`

Replaceable by the property `max` of the given [`additional`](https://error.angular-package.dev/constructor#additional-min-number-max-number-type-string) parameter.

#### `{min}`

Replaceable by the property `min` of the given [`additional`](https://error.angular-package.dev/constructor#additional-min-number-max-number-type-string) parameter.

#### `{problem}`

Replaceable by the given required [`problem`](https://error.angular-package.dev/constructor#problem-string) parameter.

#### `{type}`

Replaceable by the property `type` of the given [`additional`](https://error.angular-package.dev/constructor#additional-min-number-max-number-type-string) parameter.

## Example usage

```typescript
// Example usage.
import { CommonError } from '@angular-package/error';

// Change the template.
CommonError.template = `Problem({id}): {problem} => Fix: {fix}`;

// Extend the `CommonError` class.
class TestError<Id extends string> extends CommonError<Id> {}

// Returns
// Error: Problem(AE:427): The `age` parameter is wrong. => Fix: Provided `age`
// must be different type.
new TestError(
  'The `age` parameter is wrong.', // Problem
  'Provided `age` must be different type. ', // Fix
  'AE:427' // Identification
);
```


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