Build prettier options only once

Author: akx

src/cli.ts

@@ -26,25 +26,25 @@ program
         if (!globPattern) {
             throw new Error('You must provide a file name or glob pattern to transform');
         }
+        const prettierOptions: prettier.Options = {
+            arrowParens: program.arrowParens,
+            bracketSpacing: !program.noBracketSpacing,
+            jsxBracketSameLine: !!program.jsxBracketSameLine,
+            printWidth: parseInt(program.printWidth, 10),
+            proseWrap: program.proseWrap,
+            semi: !program.noSemi,
+            singleQuote: !!program.singleQuote,
+            tabWidth: parseInt(program.tabWidth, 10),
+            trailingComma: program.trailingComma,
+            useTabs: !!program.useTabs,
+        };
         const files = glob.sync(globPattern, {});
         for (const file of files) {
             const filePath = path.resolve(file);
             const newPath = filePath.replace(/\.jsx?$/, '.tsx');
 
             try {
                 fs.renameSync(filePath, newPath);
-                const prettierOptions: prettier.Options = {
-                    arrowParens: program.arrowParens,
-                    bracketSpacing: !program.noBracketSpacing,
-                    jsxBracketSameLine: !!program.jsxBracketSameLine,
-                    printWidth: parseInt(program.printWidth, 10),
-                    proseWrap: program.proseWrap,
-                    semi: !program.noSemi,
-                    singleQuote: !!program.singleQuote,
-                    tabWidth: parseInt(program.tabWidth, 10),
-                    trailingComma: program.trailingComma,
-                    useTabs: !!program.useTabs,
-                };
                 const result = run(newPath, prettierOptions);
                 fs.writeFileSync(newPath, result);
             } catch (error) {

src/compiler.ts

@@ -15,7 +15,7 @@ import { TransformFactoryFactory } from '.';
 export function compile(
     filePath: string,
     factoryFactories: TransformFactoryFactory[],
-    incomingPrettierOptions: prettier.Options = {},
+    incomingPrettierOptions: prettier.Options = {}
 ) {
     const compilerOptions: ts.CompilerOptions = {
         target: ts.ScriptTarget.ES2017,
@@ -56,7 +56,7 @@ export function compile(
     const inputSource = fs.readFileSync(filePath, 'utf-8');
     const prettierOptions = getPrettierOptions(filePath, inputSource, incomingPrettierOptions);
 
-    return prettier.format(printed, incomingPrettierOptions);
+    return prettier.format(printed, prettierOptions);
 }
 
 /**
@@ -76,7 +76,7 @@ export function getPrettierOptions(filePath: string, source: string, options: pr
     const semi = getUseOfSemi(source);
     const quotations = getQuotation(source);
 
-    _.defaults(options, {
+    _.defaults(Object.assign({}, options), {
         tabWidth: indentAmount,
         useTabs: indentType && indentType === 'tab',
         printWidth: sourceWidth,