Fix prefer-object-spread in src/language-js (part 1) (#7358)

src/language-js/embed.js

@@ -222,7 +222,7 @@ function escapeTemplateCharacters(doc, raw) {
       }
     });
 
-    return Object.assign({}, currentDoc, { parts });
+    return { ...currentDoc, parts };
   });
 }
 
@@ -305,9 +305,7 @@ function replacePlaceholders(quasisDoc, expressionDocs) {
         .concat(["${", expression, "}" + suffix])
         .concat(rest);
     }
-    return Object.assign({}, doc, {
-      parts
-    });
+    return { ...doc, parts };
   });
 
   return expressions.length === replaceCounter ? newDoc : null;

src/language-js/parser-angular.js

@@ -10,14 +10,11 @@ function createParser(_parse) {
       type: "NGRoot",
       node:
         options.parser === "__ng_action" && node.type !== "NGChainedExpression"
-          ? Object.assign({}, node, {
-              type: "NGChainedExpression",
-              expressions: [node]
-            })
+          ? { ...node, type: "NGChainedExpression", expressions: [node] }
           : node
     };
   };
-  return Object.assign({ astFormat: "estree", parse }, locFns);
+  return { astFormat: "estree", parse, ...locFns };
 }
 
 module.exports = {

src/language-js/parser-flow.js

@@ -28,12 +28,12 @@ function parse(text, parsers, opts) {
   }
 
   includeShebang(text, ast);
-  return postprocess(ast, Object.assign({}, opts, { originalText: text }));
+  return postprocess(ast, { ...opts, originalText: text });
 }
 
 // Export as a plugin so we can reuse the same bundle for UMD loading
 module.exports = {
   parsers: {
-    flow: Object.assign({ parse, astFormat: "estree", hasPragma }, locFns)
+    flow: { parse, astFormat: "estree", hasPragma, ...locFns }
   }
 };

src/language-js/parser-typescript.js

@@ -31,7 +31,7 @@ function parse(text, parsers, opts) {
   }
 
   includeShebang(text, ast);
-  return postprocess(ast, Object.assign({}, opts, { originalText: text }));
+  return postprocess(ast, { ...opts, originalText: text });
 }
 
 function tryParseTypeScript(text, jsx) {
@@ -59,7 +59,7 @@ function isProbablyJsx(text) {
   ).test(text);
 }
 
-const parser = Object.assign({ parse, astFormat: "estree", hasPragma }, locFns);
+const parser = { parse, astFormat: "estree", hasPragma, ...locFns };
 
 // Export as a plugin so we can reuse the same bundle for UMD loading
 module.exports = {

src/language-js/pragma.js

@@ -9,7 +9,7 @@ function hasPragma(text) {
 
 function insertPragma(text) {
   const parsedDocblock = docblock.parseWithComments(docblock.extract(text));
-  const pragmas = Object.assign({ format: "" }, parsedDocblock.pragmas);
+  const pragmas = { format: "", ...parsedDocblock.pragmas };
   const newDocblock = docblock
     .print({
       pragmas,

src/language-js/preprocess.js

@@ -7,12 +7,13 @@ function preprocess(ast, options) {
     case "json-stringify":
     case "__js_expression":
     case "__vue_expression":
-      return Object.assign({}, ast, {
+      return {
+        ...ast,
         type: options.parser.startsWith("__") ? "JsExpressionRoot" : "JsonRoot",
         node: ast,
         comments: [],
         rootMarker: options.rootMarker
-      });
+      };
     default:
       return ast;
   }