Merge pull request #11180 from webpack/test/watch-production-4

add test case for watching in production

test/watchCases/simple/production/0/changing-file.js

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+module.exports = "0";

test/watchCases/simple/production/0/changing-module.js

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+export default "0";

test/watchCases/simple/production/0/index.js

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+import module from "./changing-module";
+
+it("should watch for changes", function () {
+	expect(require("./changing-file")).toBe(WATCH_STEP);
+	expect(module).toBe(WATCH_STEP);
+});

test/watchCases/simple/production/1/changing-file.js

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+module.exports = "1";

test/watchCases/simple/production/1/changing-module.js

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+export default "1";

test/watchCases/simple/production/2/changing-file.js

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+module.exports = "2";

test/watchCases/simple/production/2/changing-module.js

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+export default "2";

test/watchCases/simple/production/webpack.config.js

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+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	mode: "production"
+};