Support completions contextual types in more places #20768
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sandersn
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Jan 3, 2018
| @@ -13943,7 +13943,7 @@ namespace ts { | |||
| // the contextual type of an initializer expression is the type annotation of the containing declaration, if present. | |||
| function getContextualTypeForInitializerExpression(node: Expression): Type { | |||
| const declaration = <VariableLikeDeclaration>node.parent; | |||
| if (hasInitializer(declaration) && node === declaration.initializer || node.kind === SyntaxKind.EqualsToken) { | |||
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Why does = go away? I guess that it's because in batch compilation, = doesn't have a type, and node is in fact only ever = when called from services.
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Right, this code was added in #20020 and this PR moves the special cases to completions.ts.
| case SyntaxKind.ExclamationEqualsEqualsToken: | ||
| case SyntaxKind.ExclamationEqualsToken: | ||
| // For completions after `x === ` | ||
| return node === operatorToken ? getTypeOfExpression(binaryExpression.left) : undefined; |
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is this really not used anywhere else besides services?
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Yes, this was also added by #20020.
src/services/completions.ts
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| case ts.SyntaxKind.EqualsToken: | ||
| return ts.isVariableDeclaration(parent) | ||
| ? checker.getContextualType(parent.initializer) | ||
| : ts.isBinaryExpression(parent) |
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can you reformat like so?
return ts.isVariableDeclaration(parent) ? checker.getContextualType(parent.initializer) :
ts.isBinaryExpression(parent) ? checker.getTypeAtLocation(parent.left) : undefined;
sandersn
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Jan 3, 2018
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Fixes #20760
Sequel to #20020 that supports completions-specific contextual types on an identifier after a
newexpression. Moves this code from checker to a wrapper incompletions.tssince some of these contextual types don't really make sense outside of completions. (E.g., we contextually type an identifier inconst x: T = new iden|asT, whereas a correct contextual type would be{ new(): T }.)