fix(ts-generator): empty named import generates correctly (#11)

Author: buehler

src/code-generators/typescript-generators/namedImport.ts

@@ -49,8 +49,13 @@ export function generateNamedImport(
     const space = spaceBraces ? ' ' : '';
     const specifiers = imp.specifiers.sort(specifierSort).map(o => generateSymbolSpecifier(o)).join(', ');
     const lib = imp.libraryName;
+    
+    let importSpecifiers = `${space}${specifiers}${space}`;
+    if (importSpecifiers.trim().length === 0) {
+        importSpecifiers = ' ';
+    }
 
-    const importString = `import {${space}${specifiers}${space}} from ${stringQuoteStyle}${lib}${stringQuoteStyle}${eol}`;
+    const importString = `import {${importSpecifiers}} from ${stringQuoteStyle}${lib}${stringQuoteStyle}${eol}`;
     if (importString.length > multiLineWrapThreshold) {
         const spacings = Array(tabSize + 1).join(' ');
         return multiLineImport(

test/code-generators/TypescriptCodeGenerator.spec.ts

@@ -72,6 +72,7 @@ describe('TypescriptCodeGenerator', () => {
         new NamespaceImport('namespaceLib', 'namespaceAlias'),
         namedImport,
         multiLineNamedImport,
+        new NamedImport('emptyImport'),
     ];
 
     for (const generatable of generatables) {

test/code-generators/__snapshots__/TypescriptCodeGenerator.spec.ts.snap

@@ -68,6 +68,8 @@ exports[`TypescriptCodeGenerator should generate the correct code for NamedImpor
 } from 'multiLineNamedLib';"
 `;
 
+exports[`TypescriptCodeGenerator should generate the correct code for NamedImport 3`] = `"import { } from 'emptyImport';"`;
+
 exports[`TypescriptCodeGenerator should generate the correct code for NamespaceImport 1`] = `"import * as namespaceAlias from 'namespaceLib';"`;
 
 exports[`TypescriptCodeGenerator should generate the correct code for ParameterDeclaration 1`] = `"param"`;