Allow use before declaration for export= assignments#17967
Allow use before declaration for export= assignments#17967weswigham merged 1 commit intomicrosoft:masterfrom
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We should port this to release-2.5 as well. |
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| tests/cases/compiler/exportAssignmentOfGenericType1_0.ts(1,10): error TS2449: Class 'T' used before its declaration. | |||
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Shouldn't these test changes also come with added types and symbols baselines?
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@sandersn They would - if they weren't already sitting in the folder and correct, because they never got removed when the .errors baselines started being written whenever this behavior was first changed. 🐱
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Couple of follow-up comments
| // export specifiers do not use the variable, they only make it available for use | ||
| return true; | ||
| } | ||
| // When resolving symbols for exports, the `usage` location passed in can be the export site directly |
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Could the caller normalize the provided location instead of forcing the code to add special cases? The rest of the code might need to add the parent/non-parent dual checks.
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Ehh, I don't really like the idea of special casing it in checkResolvedBlockScopedVariable, since its only looking up the declaration associated with a symbol and handing it off; it'd have to have the same special-casey logic as here (well, it'd have to dive down rather than walk up). Except we already to special-case things here, and not in checkResolvedBlockScopedVariable.
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When we started including export assignments in use before declaration checks, we did not include an exception for
export=kinds (the TS construct). It is appropriate to have an exception as the export statement is moved to after the declaration, so no TDZ error could exist at runtime.This fixes a large break in one of the projects in our RWC suite.