Bundler - Unable to bundle log FileHandler

[jmoalves]

When using deno log (https://deno.land/[email protected]/log) FileHandler, deno bundler produces code without FileHandler declaration.

How to reproduce

Source code

import * as log from "https://deno.land/std/log/mod.ts";

export async function myCLI(): Promise<void> {
    await log.setup({
        handlers: {
            file: new log.handlers.FileHandler("DEBUG", {
                filename: 'my.log'
            }),
            console: new log.handlers.ConsoleHandler("INFO")
        },
        loggers: {
            default: {
                level: "DEBUG",
                handlers: ["console", "file"]
            }
        }
    });

    log.info("Ok!");
}

if (import.meta.main) {
    myCLI();
}

saving it as bundleTest.ts

Working scenario - without deno bundle

C:\bundleTest>deno run --allow-write bundleTest.ts
INFO Ok!

Failure - deno bundle

C:\bundleTest>deno bundle bundleTest.ts bundleTest.js
Bundle file:///C:/bundleTest/bundleTest.ts
Check file:///C:/bundleTest/bundleTest.ts
Emit "bundleTest.js" (23.35KB)

C:\bundleTest>deno run --allow-write bundleTest.js
error: Uncaught (in promise) ReferenceError: FileHandler is not defined
            file: new FileHandler("DEBUG", {
                      ^
    at myCLI (file:///C:/bundleTest/bundleTest.js:807:23)
    at file:///C:/bundleTest/bundleTest.js:825:5

Deno version

1.5.4

Dependency info

C:\bundleTest>deno info bundleTest.ts
local: C:\bundleTest\bundleTest.ts
type: TypeScript
compiled: C:\Users\jmaur\AppData\Local\deno\gen\file\C\bundleTest\bundleTest.ts.js
deps: 9 unique (total 56.95KB)

file:///C:/bundleTest/bundleTest.ts (568B)
└─┬ https://deno.land/std/log/mod.ts (5.66KB)
  ├── https://deno.land/[email protected]/_util/assert.ts *
  ├─┬ https://deno.land/[email protected]/log/handlers.ts (6.16KB)
  │ ├── https://deno.land/[email protected]/fmt/colors.ts (11.27KB)
  │ ├── https://deno.land/[email protected]/fs/exists.ts (708B)
  │ ├─┬ https://deno.land/[email protected]/io/bufio.ts (21.18KB)
  │ │ ├── https://deno.land/[email protected]/_util/assert.ts (405B)
  │ │ └── https://deno.land/[email protected]/bytes/mod.ts (4.34KB)
  │ └── https://deno.land/[email protected]/log/levels.ts (1.54KB)
  ├── https://deno.land/[email protected]/log/levels.ts *
  └─┬ https://deno.land/[email protected]/log/logger.ts (5.15KB)
    └── https://deno.land/[email protected]/log/levels.ts *