Use babylon parser directly to disable strict mode

[dblandin]

We shouldn't assume that all JavaScript analyzed by this engine will adhere to strict ES6 rules. Instead, use the parser as loosely as possible when analyzing for duplication.

/usr/src/app/node_modules/babel/node_modules/babel-core/lib/transformation/file/index.js:671
      throw err;
      ^

SyntaxError: unknown: Argument name clash in strict mode (54:39)
  52 |       chart.yAxis.tickFormat(function() { return ""; });
  53 |
> 54 |       chart.tooltipContent(function(_, _, _, graph) {
     |                                        ^
  55 |         var date = d3.time.format('%b-%d')(new Date(graph.point.x));
  56 |         return "<strong><span style=\"padding:5px;\">" + date + "</span></strong>";
  57 |       });
    at Parser.pp.raise (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/location.js:24:13)
    at Parser.pp.checkLVal (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/lval.js:181:16)
    at Parser.pp.parseFunctionBody (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:766:12)
    at Parser.parseFunctionBody (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/plugins/flow.js:609:20)
    at Parser.pp.parseFunction (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/statement.js:524:8)
    at Parser.pp.parseExprAtom (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:397:19)
    at Parser.parseExprAtom (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/plugins/jsx/index.js:412:22)
    at Parser.pp.parseExprSubscripts (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:236:19)
    at Parser.pp.parseMaybeUnary (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:217:19)
    at Parser.pp.parseExprOps (/usr/src/app/node_modules/babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:163:19)

[BlakeWilliams]

Nice! LGTM

[dblandin]

@BlakeWilliams Thanks! 👍