Function getAddAsTypeOnly

test/fixtures/snapshot/typescript.js:153254–153271

(isValidTypeOnlyUseSite, isForNewImportDeclaration, symbol, targetFlags, checker, compilerOptions)

            }
        }
        function getAddAsTypeOnly(isValidTypeOnlyUseSite, isForNewImportDeclaration, symbol, targetFlags, checker, compilerOptions) {
            if (!isValidTypeOnlyUseSite) {
                // Can't use a type-only import if the usage is an emitting position
                return 4 /* AddAsTypeOnly.NotAllowed */;
            }
            if (isForNewImportDeclaration && compilerOptions.importsNotUsedAsValues === 2 /* ImportsNotUsedAsValues.Error */) {
                // Not writing a (top-level) type-only import here would create an error because the runtime dependency is unnecessary
                return 2 /* AddAsTypeOnly.Required */;
            }
            if (compilerOptions.isolatedModules && compilerOptions.preserveValueImports &&
                (!(targetFlags & 111551 /* SymbolFlags.Value */) || !!checker.getTypeOnlyAliasDeclaration(symbol))) {
                // A type-only import is required for this symbol if under these settings if the symbol will
                // be erased, which will happen if the target symbol is purely a type or if it was exported/imported
                // as type-only already somewhere between this import and the target.
                return 2 /* AddAsTypeOnly.Required */;
            }
            return 1 /* AddAsTypeOnly.Allowed */;
        }
        function tryAddToExistingImport(existingImports, isValidTypeOnlyUseSite, checker, compilerOptions) {
            return ts.firstDefined(existingImports, function (_a) {
                var declaration = _a.declaration, importKind = _a.importKind, symbol = _a.symbol, targetFlags = _a.targetFlags;