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Look for outer type parameters on VariableStatements (#37819)

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This only applies in JS, where `@template` tags can apply to
initialisers of variable declarations:

```js
/**
 * @template T
 * @returns {(b: T) => T}
 */
const seq = a => b => b
```

Fixes #36201
This commit is contained in:
Nathan Shively-Sanders
2020-04-07 08:04:33 -07:00
committed by GitHub
parent a2609b1f1b
commit 7ca6334dbd
5 changed files with 100 additions and 0 deletions
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4
src/compiler/checker.ts
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@@ -8238,6 +8238,7 @@ namespace ts {
return undefined;
}
switch (node.kind) {
case SyntaxKind.VariableStatement:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
case SyntaxKind.InterfaceDeclaration:
@@ -8265,6 +8266,9 @@ namespace ts {
else if (node.kind === SyntaxKind.ConditionalType) {
return concatenate(outerTypeParameters, getInferTypeParameters(<ConditionalTypeNode>node));
}
else if (node.kind === SyntaxKind.VariableStatement && !isInJSFile(node)) {
break;
}
const outerAndOwnTypeParameters = appendTypeParameters(outerTypeParameters, getEffectiveTypeParameterDeclarations(<DeclarationWithTypeParameters>node));
const thisType = includeThisTypes &&
(node.kind === SyntaxKind.ClassDeclaration || node.kind === SyntaxKind.ClassExpression || node.kind === SyntaxKind.InterfaceDeclaration || isJSConstructor(node)) &&