fix(runtime-core): allow spying on proxy methods #4216
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This is now rebased on top of #4472 Would be glad to hear your thoughts @yyx990803 as landing this would unblock the ecosystem to move to jest v27 |
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Now that #4472 landed, this PR is rebased on master and ready to review. The fix is intended to unblock the migration of the ecosystem to jest 27, but it also fixes a more general issue with updating proxies via |
lmiller1990
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LinusBorg
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Since Jest v26.6.1, the mock method changed (see this commit jestjs/jest@30e8020) to rely on `Object.defineProperty` in some cases. This breaks spying on proxy's methods, because even if Jest is properly calling `Object.defineProperty`, the cached value in the `get` section of the proxy is never updated, and the spy is in fact never used. This is easily reproducible as vue-next already uses a version of jest with these changes. This is blocking projects (like vue-test-utils-next and vue-cli) to update to recent Jest versions. This commit adds a `defineProperty` method to the proxy handler, that properly updates the defined value in the cache.
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Since Jest v26.6.1, the mock method changed (see this commit jestjs/jest@30e8020) to rely on
Object.definePropertyin some cases.This breaks spying on proxy's methods, because even if Jest is properly calling
Object.defineProperty, the cached value in thegetsection of the proxy is never updated, and the spy is in fact never used.This is easily reproducible as vue-next already uses a version of jest with these changes.
This is blocking projects (like vue-test-utils-next and vue-cli) to update to recent Jest versions.
This commit adds a
definePropertymethod to the proxy handler, that properly updates the defined value in the cache.Again, the fix is maybe too naive, and I'm happy to update the PR with a better solution.
edit: the same happens with Vitest