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default.before_test() — svelte Function Reference

Architecture documentation for the default.before_test() function in _config.js from the svelte codebase.

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Dependency Diagram

graph TD
  a5296f33_19cc_0849_4e97_356ed21e64f5["default.before_test()"]
  4e5bda74_26e7_452b_17a5_d2ed95a9ee83["_config.js"]
  a5296f33_19cc_0849_4e97_356ed21e64f5 -->|defined in| 4e5bda74_26e7_452b_17a5_d2ed95a9ee83
  style a5296f33_19cc_0849_4e97_356ed21e64f5 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

packages/svelte/tests/hydration/samples/element-attribute-unchanged-2/_config.js lines 9–18

	before_test() {
		orig = Element.prototype.setAttribute;
		Element.prototype.setAttribute = function () {
			const stack = new Error().stack;
			if (stack?.includes('render.js')) {
				throw new Error('setAttribute called during hydration');
			}
			return orig.apply(this, arguments);
		};
	},

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Frequently Asked Questions

What does default.before_test() do?
default.before_test() is a function in the svelte codebase, defined in packages/svelte/tests/hydration/samples/element-attribute-unchanged-2/_config.js.
Where is default.before_test() defined?
default.before_test() is defined in packages/svelte/tests/hydration/samples/element-attribute-unchanged-2/_config.js at line 9.

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