Simpler reading methods for Blob interface

Category: File APIs
Type: New or changed feature
Status: Enabled by default (Chrome 76)
Intent stage: Evaluate readiness to ship

Summary

Adds three new methods to the Blob interface to perform read operations: text(), arrayBuffer(), and stream().

Motivation

Right now, developers can read a blob with a nicely promisified and/or streamified API by do something like: new Response(my_blob).body .arrayBuffer(), .text() etc The Response wrapping trick feels like a hack, and especially as long as FileReader exists, isn't very discoverable.

Standards & signals

Specification: https://github.com/w3c/FileAPI/pull/117
Firefox: Positive
Safari: No signal
Web developers: Positive — Suggested by a NodeJS developer
Tracking bug: https://crbug.com/945893

Docs: n/a

Explainers: https://github.com/w3c/FileAPI/pull/117

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