const {

tabConnection: { tabTarget, threadClient, debuggerClient }

} = connection;

DebuggerClient = debuggerClient;

if (!tabTarget || !threadClient || !debuggerClient) {

return { bpClients: {} };

}

const supportsWasm =

features.wasm && !!debuggerClient.mainRoot.traits.wasmBinarySource;

const { bpClients } = setupCommands({

threadClient,

tabTarget,

debuggerClient,

supportsWasm

});

if (actions) {

setupEvents({ threadClient, actions, supportsWasm });

}

tabTarget.on("will-navigate", actions.willNavigate);

tabTarget.on("navigate", actions.navigated);

await threadClient.reconfigure({

observeAsmJS: true,

wasmBinarySource: supportsWasm

});

// In Firefox, we need to initially request all of the sources. This

// usually fires off individual `newSource` notifications as the

// debugger finds them, but there may be existing sources already in

// the debugger (if it's paused already, or if loading the page from

// bfcache) so explicity fire `newSource` events for all returned

// sources.

const sources = await clientCommands.fetchSources();

const traits = tabTarget.activeTab ? tabTarget.activeTab.traits : null;

await actions.connect(

tabTarget.url,

traits && traits.canRewind

);

await actions.newSources(sources);

// If the threadClient is already paused, make sure to show a

// paused state.

const pausedPacket = threadClient.getLastPausePacket();

if (pausedPacket) {

clientEvents.paused("paused", pausedPacket);

}

return { bpClients };