feat(experimental): function bind

Author: h13i32maru

src/Parser/ESParser.js

@@ -63,6 +63,7 @@ export default class ESParser {
       if (experimental.classProperties) option.plugins.push('classProperties');
       if (experimental.objectRestSpread) option.plugins.push('objectRestSpread');
       if (experimental.doExpressions) option.plugins.push('doExpressions');
+      if (experimental.functionBind) option.plugins.push('functionBind');
     }
 
     return option;

src/Typedef/typedef.js

@@ -32,6 +32,7 @@
  * @property {boolean} experimentalProposal.classProperties
  * @property {boolean} experimentalProposal.objectRestSpread
  * @property {boolean} experimentalProposal.doExpressions
+ * @property {boolean} experimentalProposal.functionBind
  * @see https://esdoc.org/config.html
  */
 

test/fixture/syntax/FunctionBind.js

@@ -0,0 +1,6 @@
+function foo(){}
+export default class Foo {
+  method() {
+    this::foo();
+  }
+}

test/src/ParserTest/ESParserTest.js

@@ -8,5 +8,8 @@ describe('ESParser', ()=>{
     assert(ast.program.sourceType === 'module');
   });
 
-  // todo: enhance test patterns.
+  it('can parse "function bind"', ()=>{
+    const ast = ESParser.parse({experimentalProposal: {functionBind: true}}, './test/fixture/syntax/FunctionBind.js');
+    assert(ast.program.sourceType === 'module');
+  });
 });