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'use strict'; const common = require('../common'); const dc = require('diagnostics_channel'); const assert = require('assert'); const input = { foo: 'bar' }; const symbol = Symbol('test'); // Individual channel objects can be created to avoid future lookups const channel = dc.channel(symbol); // Expect two successful publishes later channel.subscribe(common.mustCall((message, name) => { assert.strictEqual(name, symbol); assert.deepStrictEqual(message, input); })); channel.publish(input); { assert.throws(() => { dc.channel(null); }, /ERR_INVALID_ARG_TYPE/); }