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node_modules/rxjs/src/internal/operators/concat.ts

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+import { ObservableInputTuple, OperatorFunction, SchedulerLike } from '../types';
+import { operate } from '../util/lift';
+import { concatAll } from './concatAll';
+import { popScheduler } from '../util/args';
+import { from } from '../observable/from';
+
+/** @deprecated Replaced with {@link concatWith}. Will be removed in v8. */
+export function concat<T, A extends readonly unknown[]>(...sources: [...ObservableInputTuple<A>]): OperatorFunction<T, T | A[number]>;
+/** @deprecated Replaced with {@link concatWith}. Will be removed in v8. */
+export function concat<T, A extends readonly unknown[]>(
+  ...sourcesAndScheduler: [...ObservableInputTuple<A>, SchedulerLike]
+): OperatorFunction<T, T | A[number]>;
+
+/**
+ * @deprecated Replaced with {@link concatWith}. Will be removed in v8.
+ */
+export function concat<T, R>(...args: any[]): OperatorFunction<T, R> {
+  const scheduler = popScheduler(args);
+  return operate((source, subscriber) => {
+    concatAll()(from([source, ...args], scheduler)).subscribe(subscriber);
+  });
+}