WebAudio: OscillatorOptions.periodicWave is not nullable

Category: Multimedia
Type: No developer-visible change
Status: Enabled by default (Chrome 90)
Intent stage: Start prototyping

Breaking change: No
Enterprise impact: None
Spec maturity: Incubation
Web Platform Tests: Yes

WPT details: Construction of OscillatorNode is fully tested: https://wpt.fyi/results/webaudio/the-audio-api/the-oscillatornode-interface?label=experimental&label=master&aligned But there was no test that setting periodicWave to null. This will get added when the implementation lands.

Summary

It is no longer possible to set the periodicWave member of OscillatorOptions to null. The WebAudio spec doesn't allow this, so we're aligning Chrome with the spec and also Firefox, which has implemented this correctly for 4 years.

Motivation

Align with spec

Standards & signals

Specification: https://webaudio.github.io/web-audio-api/#dictdef-oscillatoroptions
Firefox: Shipped/Shipping — Linked to the Firefox commit that has the correct IDL for this feature.
Safari: No signal
Web developers: No signals
Tracking bug: https://crbug.com/1093016

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=webaudio%2Fthe-audio-api%2Fthe-oscillatornode-interface
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+WebAudio%3A%20OscillatorOptions.periodicWave%20is%20not%20nullable
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=WebAudio%3A%20OscillatorOptions.periodicWave%20is%20not%20nullable
Baseline status: https://webstatus.dev/?q=WebAudio%3A%20OscillatorOptions.periodicWave%20is%20not%20nullable

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