40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
console.log(name, "background page loaded");
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async function testMessageHandler(msg, sender) {
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console.log(name, "background received msg", {msg, sender});
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// We only expect messages coming from a content script in this test.
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if (!sender.tab || !msg.startsWith("test-multiple-onmessage-listeners:")) {
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return {
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success: false,
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failureReason: `An unexpected message has been received: ${JSON.stringify({msg, sender})}`,
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};
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}
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if (msg.endsWith(":resolve-to-undefined")) {
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return undefined;
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}
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if (msg.endsWith(":resolve-to-null")) {
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return null;
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}
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return {
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success: false,
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failureReason: `An unexpected message has been received: ${JSON.stringify({msg, sender})}`,
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};
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}
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// Register the same message handler twice.
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browser.runtime.onMessage.addListener(testMessageHandler);
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browser.runtime.onMessage.addListener(testMessageHandler);
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// Register an additional message handler that always reply after
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// a small latency time.
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browser.runtime.onMessage.addListener(async (msg, sender) => {
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await new Promise(resolve => setTimeout(resolve, 100));
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return "resolved-to-string-with-latency";
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});
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console.log(name, "background page ready to receive a content script message...");
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