Fix token types for experimental operators (#632)

* Added failing tests

* Recognized nullish coalescing, optional chaining and pipeline operators as Punctuator tokens

lib/babylon-to-espree/toToken.js

@@ -19,16 +19,19 @@ module.exports = function(token, tt, source) {
     type === tt.bracketR ||
     type === tt.ellipsis ||
     type === tt.arrow ||
+    type === tt.pipeline ||
     type === tt.star ||
     type === tt.incDec ||
     type === tt.colon ||
     type === tt.question ||
+    type === tt.questionDot ||
     type === tt.template ||
     type === tt.backQuote ||
     type === tt.dollarBraceL ||
     type === tt.at ||
     type === tt.logicalOR ||
     type === tt.logicalAND ||
+    type === tt.nullishCoalescing ||
     type === tt.bitwiseOR ||
     type === tt.bitwiseXOR ||
     type === tt.bitwiseAND ||

test/babel-eslint.js

@@ -256,6 +256,36 @@ describe("babylon-to-espree", () => {
     parseAndAssertSame("export { foo as bar };");
   });
 
+  // Espree doesn't support the optional chaining operator yet
+  it("optional chaining operator (token)", () => {
+    const code = "foo?.bar";
+    var babylonAST = babelEslint.parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
+  // Espree doesn't support the nullish coalescing operator yet
+  it("nullish coalescing operator (token)", () => {
+    const code = "foo ?? bar";
+    var babylonAST = babelEslint.parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
+  // Espree doesn't support the pipeline operator yet
+  it("pipeline operator (token)", () => {
+    const code = "foo |> bar";
+    var babylonAST = babelEslint.parseForESLint(code, {
+      eslintVisitorKeys: true,
+      eslintScopeManager: true,
+    }).ast;
+    assert.strictEqual(babylonAST.tokens[1].type, "Punctuator");
+  });
+
   it.skip("empty program with line comment", () => {
     parseAndAssertSame("// single comment");
   });