JavaScript error in Widgets-JS on websites using FastDOM 1.0 (with JSFiddle demo!)

[Steffen185]

Twitter’s widgets-js script throws an error if the website uses FastDOM 1.0:

widgets.js:8 Uncaught (in promise) TypeError: u.write is not a function(…)

JSFiddle demo: https://jsfiddle.net/steffenweber/bph95z8j/

Twitter’s widgets-js checks whether window.fastdom exists. If it does not exist then widgets-js injects its own copy of FastDOM 0.x and everything is fine. However, if window.fastdom does exist then widgets-js uses it assuming that the FastDOM version is 0.x and not the current version 1.0 (which has a completely different API). This is where things break.

For example, fastdom.read and fastdom.write have been renamed to fastdom.measure and fastdom.mutate in FastDOM 1.0. Furthermore, fastdom.defer has been removed.

[niall]

Thank you for your report. We acknowledge the issue and are working on a solution with FastDom.

[Steffen185]

For reference, a link to the FastDOM bug report: https://github.com/wilsonpage/fastdom/issues/90

[system]

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