timing.js | Navigation Timing API measurement helpers | Browser Plugin library
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QUESTION
I'm having a little trouble getting the Jest testing framework (version 23.2.0) to work nicely when using a combination of fake timers and promises. Where am I going wrong?
Let's say I have the following module:
...ANSWER
Answered 2018-Jul-02 at 08:38You're not doing anything wrong - it doesn't work at the moment - sorry. The following things have to happen before this will work from our end:
- Jest needs to merge the ongoing work to merge lolex as their fake timer implementation here https://github.com/facebook/jest/pull/5171
- Lolex needs to support pumping through promises - we've discussed this with the V8 team in a recent Node.js collaborator summit. That would expose a hook we'll use to allow doing something like
advanceTimeByTime(100)and have that work with promises.
The problem in a gist is that the .then(spy) only gets called later.
As we are volunteers - there is no concrete timeline for these things. I hope SimenB does the merge in the coming 2-3 months and I'll follow up with the hook with the V8 team next month.
What you can do nowYou can always write an async test:
QUESTION
I'm trying to figure out how to extract some information from babel compilation process.
More specifically, when I run babel (no matter if using Webpack's babel-loader, test frameworks' transformers, Babel's CLI, etc) I'd need to extract some information for each compiled file. Like:
- file path
- time taken to compile
- any other meta data?
Works fine but it provides only Webpack's loaders running time. No info about single compiled files.
Hook into Webpack's compiler/compilation instanceI considered writing a Webpack plugin to hook into the compilation process as described here, but I couldn't find the proper hooks to recognize a file being processed by babel.
I guess @kidroca pointed out the right direction. More specifically I understand that Babel’s wrapPluginVisitorMethod option is the key for hooking into Babel compilation process.
See babel-minify’s timing plugin.
Related threads:
- https://github.com/babel/babel/issues/5340
- https://github.com/babel/babel/issues/2206
- https://github.com/babel/babel/pull/3659
- https://github.com/babel/minify/pull/93
- https://github.com/babel/babel/pull/3659
I eventually tried to wrap a solution into a tool I called babel-timing.
...ANSWER
Answered 2019-Apr-14 at 01:23You can use @babel/core and babel.transformSync(code) which will return
Abstract Syntax Tree (AST) information along with some other data. And you can also add some logic to measure the performance of this method
I've setup a minimal repo and played with it myself a little bit: https://github.com/kidroca/babel-meta
Basically you can run npm run analyze-file ./es6-src/es6-module.js or npm run analyze-dir ./es6-src/es6-module.js and checkout the results
This will return:
QUESTION
I am currenly in the process of learning javascript and one of my tasks is to loop through all divs with a particular class name and show/hide them one by one with a catch where the timing for every div is different and the correct value is stored in the data-attribute tag in every div with that particular class name.
...ANSWER
Answered 2019-Feb-14 at 19:40You can use something like this:
QUESTION
I have a file called paintTiming.js, which uses the Paint Timing API for finding out Web Performance paramters such as First Paint and First Contextual Paint. The file contents are shown below:
...ANSWER
Answered 2018-Mar-06 at 07:31You may not able to use the function if this is declared inside .then. Because this function abc is private to the callback function passed to .then & .then will only execute with the ajax.
Alternatively you can define this function outside the Promise and call this function inside the .then callback. Also need to bind the context using this
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