bridgeBrowserOpField top-level constant
String
const bridgeBrowserOpField
Payload key carrying the browser op name inside a browserReq frame.
The envelope op is browserReq itself, so the browser op cannot ride
the same key (JSON objects have flat, unique keys); the contract's
browserReq {id, op, args} maps id → envelope id and op → this
field.
Implementation
const String bridgeBrowserOpField = 'req';