Avoid cast by providing type predicate to isExternalModuleAugmentation #22119
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mhegazy
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Feb 22, 2018
src/compiler/utilities.ts
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| export function isAmbientModule(node: Node): boolean { | ||
| return node && node.kind === SyntaxKind.ModuleDeclaration && | ||
| ((<ModuleDeclaration>node).name.kind === SyntaxKind.StringLiteral || isGlobalScopeAugmentation(<ModuleDeclaration>node)); | ||
| export interface AmbientModuleDeclaration extends ModuleDeclaration { body?: ModuleBlock; } |
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should we move this to types?
mhegazy
reviewed
Feb 22, 2018
src/compiler/binder.ts
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| } | ||
| else { | ||
| const state = declareModuleSymbol(node); | ||
| const { symbol } = node; |
mhegazy
reviewed
Feb 22, 2018
src/compiler/binder.ts
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| if (hasModifier(node, ModifierFlags.Export)) { | ||
| errorOnFirstToken(node, Diagnostics.export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible); | ||
| } | ||
| const { name } = node; |
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u can move this to the else block
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Control flow was confused because node was already an AmbientModuleDeclaration and isExternalModuleAugmentation re-checks that (thus node was never in the else). Broke it into two functions to avoid that.
mhegazy
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Mar 6, 2018
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This call to
addIndirectUserturns out to be valid, but it took a while to figure that out -- can verify this with a type predicate.