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Check for this.xxx access to previously declared uninitialized property

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Anders Hejlsberg
2020-04-17 10:33:28 -07:00
parent 728d9cb911
commit 5bb6487bef
1 changed files with 1 additions and 1 deletions
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src/compiler/checker.ts
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@@ -1366,7 +1366,7 @@ namespace ts {
return sourceFiles.indexOf(declarationFile) <= sourceFiles.indexOf(useFile);
}
if (declaration.pos <= usage.pos) {
if (declaration.pos <= usage.pos && !(isPropertyDeclaration(declaration) && isThisProperty(usage.parent) && !declaration.initializer && !declaration.exclamationToken)) {
// declaration is before usage
if (declaration.kind === SyntaxKind.BindingElement) {
// still might be illegal if declaration and usage are both binding elements (eg var [a = b, b = b] = [1, 2])