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Add never helper function (#18287)

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* Add `never` helper function

* Move to Debug.assertNever, keep old messages
This commit is contained in:
Andy 2017-09-08 14:22:44 -07:00 committed by GitHub
parent deefb01c9d
commit 409d6597eb
1 changed files with 3 additions and 3 deletions
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6
src/compiler/checker.ts
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@ -1687,7 +1687,7 @@ namespace ts {
undefined;
}
else {
Debug.fail("Unknown entity name kind.");
Debug.assertNever(name, "Unknown entity name kind.");
}
Debug.assert((getCheckFlags(symbol) & CheckFlags.Instantiated) === 0, "Should never get an instantiated symbol here.");
return (symbol.flags & meaning) || dontResolveAlias ? symbol : resolveAlias(symbol);
@ -16357,7 +16357,7 @@ namespace ts {
// This code-path is called by language service
return resolveStatelessJsxOpeningLikeElement(<JsxOpeningLikeElement>node, checkExpression((<JsxOpeningLikeElement>node).tagName), candidatesOutArray);
}
Debug.fail("Branch in 'resolveSignature' should be unreachable.");
Debug.assertNever(node, "Branch in 'resolveSignature' should be unreachable.");
}
/**
@ -24535,7 +24535,7 @@ namespace ts {
currentKind = SetAccessor;
}
else {
Debug.fail("Unexpected syntax kind:" + (<Node>prop).kind);
Debug.assertNever(prop, "Unexpected syntax kind:" + (<Node>prop).kind);
}
const effectiveName = getPropertyNameForPropertyNameNode(name);