https://github.com/angular/angular
When using the safe navigation operator in a binding expression, a temporary variable may be used for storing the result of a side-effectful call. For example, the following template uses a pipe and a safe property access: ```html <app-person-view [enabled]="enabled" [firstName]="(person$ | async)?.name"></app-person-view> ``` The result of the pipe evaluation is stored in a temporary to be able to check whether it is present. The temporary variable needs to be declared in a separate statement and this would also cause the full expression itself to be pulled out into a separate statement. This would compile into the following pseudo-code instructions: ```js var temp = null; var firstName = (temp = pipe('async', ctx.person$)) == null ? null : temp.name; property('enabled', ctx.enabled)('firstName', firstName); ``` Notice that the pipe evaluation happens before evaluating the `enabled` binding, such that the runtime's internal binding index would correspond with `enabled`, not `firstName`. This introduces a problem when the pipe uses `WrappedValue` to force a change to be detected, as the runtime would then mark the binding slot corresponding with `enabled` as dirty, instead of `firstName`. This results in the `enabled` binding to be updated, triggering setters and affecting how `OnChanges` is called. In the pseudo-code above, the intermediate `firstName` variable is not strictly necessary---it only improved readability a bit---and emitting it inline with the binding itself avoids the out-of-order execution of the pipe: ```js var temp = null; property('enabled', ctx.enabled) ('firstName', (temp = pipe('async', ctx.person$)) == null ? null : temp.name); ``` This commit introduces a new `BindingForm` that results in the above code to be generated and adds compiler and acceptance tests to verify the proper behavior. Fixes #37194 PR Close #37911
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fix(compiler): evaluate safe navigation expressions in correct binding order (#37911)
File | Mode | Size |
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.circleci | ||
.devcontainer | ||
.github | ||
.ng-dev | ||
.vscode | ||
.yarn | ||
aio | ||
dev-infra | ||
docs | ||
goldens | ||
integration | ||
modules | ||
packages | ||
scripts | ||
third_party | ||
tools | ||
.bazelignore | -rw-r--r-- | 4.3 KB |
.bazelrc | -rw-r--r-- | 6.2 KB |
.bazelversion | -rw-r--r-- | 213 bytes |
.clang-format | -rw-r--r-- | 73 bytes |
.editorconfig | -rw-r--r-- | 245 bytes |
.gitattributes | -rw-r--r-- | 314 bytes |
.gitignore | -rw-r--r-- | 726 bytes |
.gitmessage | -rw-r--r-- | 7.2 KB |
.mailmap | -rw-r--r-- | 51 bytes |
.nvmrc | -rw-r--r-- | 8 bytes |
.pullapprove.yml | -rw-r--r-- | 44.1 KB |
.yarnrc | -rw-r--r-- | 128 bytes |
BUILD.bazel | -rw-r--r-- | 1.7 KB |
CHANGELOG.md | -rw-r--r-- | 719.8 KB |
CODE_OF_CONDUCT.md | -rw-r--r-- | 1.1 KB |
CONTRIBUTING.md | -rw-r--r-- | 14.2 KB |
LICENSE | -rw-r--r-- | 1.1 KB |
README.md | -rw-r--r-- | 1.2 KB |
WORKSPACE | -rw-r--r-- | 4.3 KB |
browser-providers.conf.js | -rw-r--r-- | 8.9 KB |
gulpfile.js | -rw-r--r-- | 1.2 KB |
karma-js.conf.js | -rw-r--r-- | 7.6 KB |
package.json | -rw-r--r-- | 8.3 KB |
test-events.js | -rw-r--r-- | 259 bytes |
test-main.js | -rw-r--r-- | 11.3 KB |
tslint.json | -rw-r--r-- | 2.3 KB |
yarn.lock | -rw-r--r-- | 676.1 KB |
yarn.lock.readme.md | -rw-r--r-- | 1.3 KB |
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Computing file changes ...