Prometheus 2.2.1 /graph page doesn't work with Internet Explorer 11

[adamc99]

What did you do?
Load the main /graph page with Internet Explorer 11.

What did you expect to see?
I expected it to load successfully and allow normal functionality, like with Chrome.

What did you see instead? Under which circumstances?
The page partially loads but doesn't include elements like the query text box, execute button and data tables/graphs.

With the IE developer tools open, the error
"SCRIPT1003: Expected ':'
File: index.js, Line: 265, Column:11"
appears in the console tab.

This seems to refer to the line

    source,

in the context of:

Prometheus.Graph.prototype.initTypeahead = function(self) {
  const source = queryHistory.isEnabled() ? pageConfig.queryHistMetrics.concat(pageConfig.allMetrics) : pageConfig.allMetrics;
  self.expr.typeahead({
    autoSelect: false,
    source,
    items: "all",

This occurs every time, tested from many machines and against multiple server instances (2.2.1 and built from master as of 18th Apr 2018).

As an attempt to investigate the issue, I manually compiled a version (based off of master as of 18th Apr 2018) with the line

    source,

changed to

    source: source,

and this seems to correct the issue: the page loads and basic functionality like querying for data and drawing graphs appear to work in both IE 11 and Chrome.

Prometheus version:

prometheus, version 2.2.1 (branch: HEAD, revision: bc6058c)
build user: root@149e5b3f0829
build date: 20180314-14:15:45
go version: go1.10

[bege13mot]

Hi,

Hope my pull request will be helpful.

[lock]

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