clhenrick

// MyType is a generic that we can pass different types when calling handleAsyncTask()
const handleAsyncTask = async function<MyType> (asyncFn: () => Promise<MyType | string>) : Promise<[boolean, MyType | undefined]> {
  const result = await asyncFn();
  if (typeof result === 'string') {
    return [true, undefined];
  }
  return [false, result];
}

kconner

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

clhenrick

#!/bin/bash
set -e

# dependencies:
# - youtube-dl: https://ytdl-org.github.io/youtube-dl/
# - ffmpeg: https://ffmpeg.org/

# make sure youtube-dl dep exists
if ! command -v youtube-dl &> /dev/null
then

jackrusher

Twitter abuses all media file uploads, each type in its own way. If we want to upload a good looking animation loop from some low-color, high-detail generative art, we have to game their system's mechanisms.

• don't upload a video file, they will re-encode it into absolute 💩

• create a GIF, which they will auto-convert into a video file 😱

• The frames of the GIF will be resized to an even-sized width using an extremely naive algorithm. Your GIF should be an even size (1000, 2000,

devadvance

ffmpeg -ss $INPUT_START_TIME -t $LENGTH -i $INPUT_FILENAME \
-vf "fps=$OUTPUT_FPS,scale=$OUTPUT_WIDTH:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
-loop $NUMBER_OF_LOOPS $OUTPUT_FILENAME

# Change these placeholders:
# * $INPUT_START_TIME - number of seconds in the input video to start from.
# * $LENGTH - number of seconds to convert from the input video.
# * $INPUT_FILENAME - path to the input video.
# * $OUTPUT_FPS - ouput frames per second. Start with `10`.
# * $OUTPUT_WIDTH - output width in pixels. Aspect ratio is maintained.

rstacruz

Setting up Jest with ESM

Here are some different ways on how to set up Jest to support ESM. This applies for Jest v25, Node v13, and Babel v7.

Method A: Native Node.js support

Node v14 and Jest v26 support ESM natively with the --experimental-vm-modules flag.

Install cross-env:

IanColdwater

Mute these words in your settings here: https://twitter.com/settings/muted_keywords

ActivityTweet
generic_activity_highlights
generic_activity_momentsbreaking
RankedOrganicTweet
suggest_activity
suggest_activity_feed
suggest_activity_highlights
suggest_activity_tweet

clhenrick

#!/usr/bin/env bash

URI="https://services1.arcgis.com/sTaVXkn06Nqew9yU/ArcGIS/rest/services/Political_Boundaries_Feb2016/FeatureServer/1/query?&outfields=*&f=geojson&where=objectid%20is%20not%20null"

ogr2ogr -f GeoJSON ca_assembly_districts.json $URI OGRGeoJSON

clhenrick

This is a demonstartion of how to align arbitrary GeoJSON data to the us-atlas topojson data.

It's important to note that the TopoJSON from us-atlas has it's map projection, (d3.geoAlbersUsa), built into it. In other words, it is considered "projected" geographic data.

This is an important distinction from GeoJSON data which is most typically stored in the unprojected Coordinate Reference System WGS84, also commonly referred to as "lat, lon" (though coordinates are most often stored in the order longitude, latitude).

johnniehard

I had a large dataset in postgis and wanted to avoid the hassle of first exporting it to a several GB geojson file before tiling it with Tippecanoe.

ogr2ogr -f GeoJSON /dev/stdout \                                                                            
PG:"host=localhost dbname=postgres user=postgres password=thepassword" \
-sql "select * from a, roi where a.geom && roi.geom" \
| docker run -i -v ${PWD}:/data tippecanoe:latest tippecanoe \
--output=/data/yourtiles.mbtiles