> ## Documentation Index
> Fetch the complete documentation index at: https://e2b-banner-hover-tooltip.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Template logger

### LogEntry

Represents a single log entry from the template build process.

#### Extended by

* `LogEntryStart`
* `LogEntryEnd`

#### Constructors

```ts theme={null}
new LogEntry(
   timestamp: Date, 
   level: LogEntryLevel, 
   message: string): LogEntry
```

###### Parameters

| Parameter   | Type            |
| ----------- | --------------- |
| `timestamp` | `Date`          |
| `level`     | `LogEntryLevel` |
| `message`   | `string`        |

###### Returns

`LogEntry`

#### Properties

| Property    | Modifier   | Type            |
| ----------- | ---------- | --------------- |
| `level`     | `readonly` | `LogEntryLevel` |
| `message`   | `readonly` | `string`        |
| `timestamp` | `readonly` | `Date`          |

#### Methods

### toString()

```ts theme={null}
toString(): string
```

###### Returns

`string`

***

### LogEntryEnd

Special log entry indicating the end of a build process.

#### Constructors

```ts theme={null}
new LogEntryEnd(timestamp: Date, message: string): LogEntryEnd
```

###### Parameters

| Parameter   | Type     |
| ----------- | -------- |
| `timestamp` | `Date`   |
| `message`   | `string` |

###### Returns

`LogEntryEnd`

#### Properties

| Property    | Modifier   | Type            | Inherited from         |
| ----------- | ---------- | --------------- | ---------------------- |
| `level`     | `readonly` | `LogEntryLevel` | `LogEntry`.`level`     |
| `message`   | `readonly` | `string`        | `LogEntry`.`message`   |
| `timestamp` | `readonly` | `Date`          | `LogEntry`.`timestamp` |

#### Methods

### toString()

```ts theme={null}
toString(): string
```

###### Returns

`string`

***

### LogEntryStart

Special log entry indicating the start of a build process.

#### Constructors

```ts theme={null}
new LogEntryStart(timestamp: Date, message: string): LogEntryStart
```

###### Parameters

| Parameter   | Type     |
| ----------- | -------- |
| `timestamp` | `Date`   |
| `message`   | `string` |

###### Returns

`LogEntryStart`

#### Properties

| Property    | Modifier   | Type            | Inherited from         |
| ----------- | ---------- | --------------- | ---------------------- |
| `level`     | `readonly` | `LogEntryLevel` | `LogEntry`.`level`     |
| `message`   | `readonly` | `string`        | `LogEntry`.`message`   |
| `timestamp` | `readonly` | `Date`          | `LogEntry`.`timestamp` |

#### Methods

### toString()

```ts theme={null}
toString(): string
```

###### Returns

`string`

## Type Aliases

### LogEntryLevel

```ts theme={null}
type LogEntryLevel: "debug" | "info" | "warn" | "error";
```

Log entry severity levels.

## Functions

### defaultBuildLogger()

```ts theme={null}
function defaultBuildLogger(options?: object): (logEntry: LogEntry) => void
```

Create a default build logger with animated timer display.

#### Parameters

| Parameter           | Type            | Description                                    |
| ------------------- | --------------- | ---------------------------------------------- |
| `options`?          | `object`        | Logger configuration options                   |
| `options.minLevel`? | `LogEntryLevel` | Minimum log level to display (default: 'info') |

#### Returns

`Function`

Logger function that accepts LogEntry instances

### Parameters

| Parameter  | Type       |
| ---------- | ---------- |
| `logEntry` | `LogEntry` |

### Returns

`void`

#### Example

```ts theme={null}
import { Template, defaultBuildLogger } from 'e2b'

const template = Template().fromPythonImage()

await Template.build(template, {
  alias: 'my-template',
  onBuildLogs: defaultBuildLogger({ minLevel: 'debug' })
})
```