Use ?. where it represents the intended semantics (#11512)

packages/babel-generator/src/buffer.js

@@ -44,7 +44,7 @@ export default class Buffer {
       // source string since it may be arbitrarily large after all transformations
       code: this._buf.join("").trimRight(),
       map: null,
-      rawMappings: map && map.getRawMappings(),
+      rawMappings: map?.getRawMappings(),
     };
 
     if (map) {
@@ -315,10 +315,10 @@ export default class Buffer {
     const origFilename = targetObj.filename;
 
     targetObj.identifierName =
-      (prop === "start" && loc && loc.identifierName) || null;
-    targetObj.line = pos ? pos.line : null;
-    targetObj.column = pos ? pos.column : null;
-    targetObj.filename = (loc && loc.filename) || null;
+      (prop === "start" && loc?.identifierName) || null;
+    targetObj.line = pos?.line;
+    targetObj.column = pos?.column;
+    targetObj.filename = loc?.filename;
 
     // We want to skip reassigning `force` if we're re-setting the same position.
     if (

packages/babel-generator/src/generators/base.js

@@ -21,7 +21,7 @@ export function BlockStatement(node: Object) {
   this.token("{");
   this.printInnerComments(node);
 
-  const hasDirectives = node.directives && node.directives.length;
+  const hasDirectives = node.directives?.length;
 
   if (node.body.length || hasDirectives) {
     this.newline();

packages/babel-generator/src/generators/modules.js

@@ -147,7 +147,7 @@ export function ImportDeclaration(node: Object) {
   }
 
   const specifiers = node.specifiers.slice(0);
-  if (specifiers && specifiers.length) {
+  if (specifiers?.length) {
     // print "special" specifiers first
     for (;;) {
       const first = specifiers[0];

packages/babel-generator/src/node/whitespace.js

@@ -196,10 +196,7 @@ nodes.ObjectTypeCallProperty = function(
   node: Object,
   parent,
 ): ?WhitespaceObject {
-  if (
-    parent.callProperties[0] === node &&
-    (!parent.properties || !parent.properties.length)
-  ) {
+  if (parent.callProperties[0] === node && !parent.properties?.length) {
     return {
       before: true,
     };
@@ -209,8 +206,8 @@ nodes.ObjectTypeCallProperty = function(
 nodes.ObjectTypeIndexer = function(node: Object, parent): ?WhitespaceObject {
   if (
     parent.indexers[0] === node &&
-    (!parent.properties || !parent.properties.length) &&
-    (!parent.callProperties || !parent.callProperties.length)
+    !parent.properties?.length &&
+    !parent.callProperties?.length
   ) {
     return {
       before: true,
@@ -224,9 +221,9 @@ nodes.ObjectTypeInternalSlot = function(
 ): ?WhitespaceObject {
   if (
     parent.internalSlots[0] === node &&
-    (!parent.properties || !parent.properties.length) &&
-    (!parent.callProperties || !parent.callProperties.length) &&
-    (!parent.indexers || !parent.indexers.length)
+    !parent.properties?.length &&
+    !parent.callProperties?.length &&
+    !parent.indexers?.length
   ) {
     return {
       before: true,

packages/babel-generator/src/printer.js

@@ -310,7 +310,7 @@ export default class Printer {
 
     // catch up to this nodes newline if we're behind
     const pos = loc ? loc[prop] : null;
-    if (pos && pos.line !== null) {
+    if (pos?.line != null) {
       const count = pos.line - this._buf.getCurrentLine();
 
       for (let i = 0; i < count; i++) {
@@ -360,7 +360,7 @@ export default class Printer {
 
   endTerminatorless(state: Object) {
     this._noLineTerminator = false;
-    if (state && state.printed) {
+    if (state?.printed) {
       this.dedent();
       this.newline();
       this.token(")");
@@ -380,7 +380,7 @@ export default class Printer {
       throw new ReferenceError(
         `unknown node of type ${JSON.stringify(
           node.type,
-        )} with constructor ${JSON.stringify(node && node.constructor.name)}`,
+        )} with constructor ${JSON.stringify(node?.constructor.name)}`,
       );
     }
 
@@ -463,7 +463,7 @@ export default class Printer {
   }
 
   printJoin(nodes: ?Array, parent: Object, opts = {}) {
-    if (!nodes || !nodes.length) return;
+    if (!nodes?.length) return;
 
     if (opts.indent) this.indent();
 
@@ -523,7 +523,7 @@ export default class Printer {
   }
 
   printInnerComments(node, indent = true) {
-    if (!node.innerComments || !node.innerComments.length) return;
+    if (!node.innerComments?.length) return;
     if (indent) this.indent();
     this._printComments(node.innerComments);
     if (indent) this.dedent();
@@ -606,7 +606,7 @@ export default class Printer {
         : `/*${comment.value}*/`;
 
     if (isBlockComment && this.format.indent.adjustMultilineComment) {
-      const offset = comment.loc && comment.loc.start.column;
+      const offset = comment.loc?.start.column;
       if (offset) {
         const newlineRegex = new RegExp("\\n\\s{1," + offset + "}", "g");
         val = val.replace(newlineRegex, "\n");
@@ -630,7 +630,7 @@ export default class Printer {
   }
 
   _printComments(comments?: Array<Object>, inlinePureAnnotation?: boolean) {
-    if (!comments || !comments.length) return;
+    if (!comments?.length) return;
 
     if (
       inlinePureAnnotation &&