Default to hash syntax for Record&Tuple

packages/babel-generator/src/generators/types.ts

@@ -117,15 +117,18 @@ export function RecordExpression(this: Printer, node: t.RecordExpression) {
   if (this.format.recordAndTupleSyntaxType === "bar") {
     startToken = "{|";
     endToken = "|}";
-  } else if (this.format.recordAndTupleSyntaxType === "hash") {
-    startToken = "#{";
-    endToken = "}";
-  } else {
+  } else if (
+    this.format.recordAndTupleSyntaxType !== "hash" &&
+    this.format.recordAndTupleSyntaxType != null
+  ) {
     throw new Error(
       `The "recordAndTupleSyntaxType" generator option must be "bar" or "hash" (${JSON.stringify(
         this.format.recordAndTupleSyntaxType,
       )} received).`,
     );
+  } else {
+    startToken = "#{";
+    endToken = "}";
   }
 
   this.token(startToken);

packages/babel-generator/test/fixtures/recordAndTupleSyntaxType/missing-option/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": [["recordAndTuple", { "syntaxType": "hash" }]],
-  "throws": "The \"recordAndTupleSyntaxType\" generator option must be \"bar\" or \"hash\" (undefined received)"
+  "plugins": ["recordAndTuple"]
 }

packages/babel-generator/test/fixtures/recordAndTupleSyntaxType/missing-option/output.js

@@ -0,0 +1,3 @@
+#{
+  a: 1
+};

packages/babel-parser/src/plugin-utils.ts

@@ -187,12 +187,13 @@ export function validatePlugins(plugins: PluginList) {
 
   if (
     hasPlugin(plugins, "recordAndTuple") &&
+    getPluginOption(plugins, "recordAndTuple", "syntaxType") != null &&
     !RECORD_AND_TUPLE_SYNTAX_TYPES.includes(
       getPluginOption(plugins, "recordAndTuple", "syntaxType"),
     )
   ) {
     throw new Error(
-      "'recordAndTuple' requires 'syntaxType' option whose value should be one of: " +
+      "The 'syntaxType' option of the 'recordAndTuple' plugin must be one of: " +
         RECORD_AND_TUPLE_SYNTAX_TYPES.map(p => `'${p}'`).join(", "),
     );
   }

packages/babel-parser/src/tokenizer/index.ts

@@ -493,7 +493,7 @@ export default abstract class Tokenizer extends CommentsParser {
       // which is not allowed in the spec. Throwing expecting recordAndTuple is
       // misleading
       this.expectPlugin("recordAndTuple");
-      if (this.getPluginOption("recordAndTuple", "syntaxType") !== "hash") {
+      if (this.getPluginOption("recordAndTuple", "syntaxType") === "bar") {
         throw this.raise(
           next === charCodes.leftCurlyBrace
             ? Errors.RecordExpressionHashIncorrectStartSyntaxType

packages/babel-parser/test/fixtures/experimental/record-and-tuple/default-hash/input.js

@@ -0,0 +1 @@
+#{ a: 1 }

packages/babel-parser/test/fixtures/experimental/record-and-tuple/default-hash/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["recordAndTuple"]
+}

packages/babel-parser/test/fixtures/experimental/record-and-tuple/default-hash/output.json

@@ -0,0 +1,44 @@
+{
+  "type": "File",
+  "start":0,"end":9,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":9,"index":9}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":9,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":9,"index":9}},
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start":0,"end":9,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":9,"index":9}},
+        "expression": {
+          "type": "RecordExpression",
+          "start":0,"end":9,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":9,"index":9}},
+          "properties": [
+            {
+              "type": "ObjectProperty",
+              "start":3,"end":7,"loc":{"start":{"line":1,"column":3,"index":3},"end":{"line":1,"column":7,"index":7}},
+              "method": false,
+              "key": {
+                "type": "Identifier",
+                "start":3,"end":4,"loc":{"start":{"line":1,"column":3,"index":3},"end":{"line":1,"column":4,"index":4},"identifierName":"a"},
+                "name": "a"
+              },
+              "computed": false,
+              "shorthand": false,
+              "value": {
+                "type": "NumericLiteral",
+                "start":6,"end":7,"loc":{"start":{"line":1,"column":6,"index":6},"end":{"line":1,"column":7,"index":7}},
+                "extra": {
+                  "rawValue": 1,
+                  "raw": "1"
+                },
+                "value": 1
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/record-and-tuple/invalid-type-bar-record/options.json

@@ -1,4 +1,4 @@
 {
   "plugins": [["recordAndTuple", { "syntaxType": "invalid" }]],
-  "throws": "'recordAndTuple' requires 'syntaxType' option whose value should be one of: 'hash', 'bar'"
+  "throws": "The 'syntaxType' option of the 'recordAndTuple' plugin must be one of: 'hash', 'bar'"
 }

packages/babel-parser/test/fixtures/experimental/record-and-tuple/invalid-type-bar-tuple/options.json

@@ -1,4 +1,4 @@
 {
   "plugins": [["recordAndTuple", { "syntaxType": "invalid" }]],
-  "throws": "'recordAndTuple' requires 'syntaxType' option whose value should be one of: 'hash', 'bar'"
+  "throws": "The 'syntaxType' option of the 'recordAndTuple' plugin must be one of: 'hash', 'bar'"
 }

packages/babel-parser/test/fixtures/experimental/record-and-tuple/invalid-type-hash-record/options.json

@@ -1,4 +1,4 @@
 {
   "plugins": [["recordAndTuple", { "syntaxType": "invalid" }]],
-  "throws": "'recordAndTuple' requires 'syntaxType' option whose value should be one of: 'hash', 'bar'"
+  "throws": "The 'syntaxType' option of the 'recordAndTuple' plugin must be one of: 'hash', 'bar'"
 }

packages/babel-parser/test/fixtures/experimental/record-and-tuple/invalid-type-hash-tuple/options.json

@@ -1,4 +1,4 @@
 {
   "plugins": [["recordAndTuple", { "syntaxType": "invalid" }]],
-  "throws": "'recordAndTuple' requires 'syntaxType' option whose value should be one of: 'hash', 'bar'"
+  "throws": "The 'syntaxType' option of the 'recordAndTuple' plugin must be one of: 'hash', 'bar'"
 }

packages/babel-parser/typings/babel-parser.d.ts

@@ -162,6 +162,7 @@ export type ParserPlugin =
   | "pipelineOperator"
   | "placeholders"
   | "privateIn" // Enabled by default
+  | "recordAndTuple"
   | "regexpUnicodeSets"
   | "throwExpressions"
   | "topLevelAwait"
@@ -186,7 +187,7 @@ export interface PipelineOperatorPluginOptions {
 }
 
 export interface RecordAndTuplePluginOptions {
-  syntaxType: "bar" | "hash";
+  syntaxType?: "bar" | "hash";
 }
 
 export interface FlowPluginOptions {