使用自定义格式化程序将Elm Debug.log输出转换为nice日志对象

使用自定义格式化程序将Elm Debug.log输出转换为nice日志对象

The standard Elm Debug.log console output:

and the same output with this package

The main module exposes register() function that replaces your console.log() and try to parse each incoming message with Elm parser. If it fails, it would pass the original message.

Limitations

Right now you can insert only alphabet characters and spaces as a Debug.log tag.

-- this would parse successfulyDebug.log "Some tag string" thingToPrintToConsole-- this would NOT BE PARSEDDebug.log "Some String (with non [a-zA-Z] chars or numbers in it) " thingToPrintToConsole

This limitation is due to the problem recognizing arbitrary tag text from the rest of the types. I'm aware of that limitation and it is something that would be addressed in the upcoming versions. Thanks for understanding.

Installation

Just install this module with Yarn:

yarn add -D elm-debug-transformer

or NPM:

npm install elm-debug-transformer

Get it directly from CDN

Roman Potashow pointed out on Elm Slack that you can use the NPM package directly without the need of installing it.

Usage

There is a nice summary of the usage in Alex Korban's article Get improved Debug.log output in the browser console

Register the console debugger in your main js file before you initialize Elm application:

import * as ElmDebugger from 'elm-debug-transformer';ElmDebugger.register();// rest of application

Here's a sample HTML for your reference:

Enable custom formatters in Chrome dev tools

Available in Chrome 47 and higher.

The output object is kind of chatty right now (it carries information about parsed type etc. - less verbose version is worked on right now).

If your browser have Chrome dev toools, you can enable custom formatters so you get less noice and nice output.

Open DevToolsGo to Settings ("three dots" icon in the upper right corner of DevTools > Menu > Settings F1 > Preferences > Console)Check-in "Enable custom formatters"Close DevToolsOpen DevTools

Note: You might need to refresh the page first time you open Console panel with existing logs - custom formatters are applied only to newly printed console messages.

That way the Debug.log would output simpler JS object without type information. Tuple, Set, Array and List would become arrays and Dict would become JS object with keys and values.

Options

Options object can be provided to register function:

import * as ElmDebugger from 'elm-debug-transformer';ElmDebugger.register({simple_mode: true, debug: false, limit: 10000});

Credits

This would probably not see the light of the day without Matt Zeunert and his blogpost about writing custom formatters. Thank you!

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