ngAnnotate - Warning: StringMap expected string key

Question

I get this warning when using Grunt and grunt-ng-annotate.

There is no reference in the warning to where the error is in the file, which makes debugging it hard.

Any ideas?

Answer 1

The issue turned out to be use of ES6 notation, in this case arrow functions (=>), default parameters and let.

I haven't looked in detail as to why ngAnnotate doesn't support this.

To find where the issues were I overrode the ngAnnotate warning with grunt switch --force and later in the build uglify complained about the ES6 syntax with more detail.

Answer 2

Possible reasons:

• () => {}
• { value }
• let
• function (...args)
• function (defaultVar = false)

Solutions:

• function () {}
• { value: value }
• var
• function (args)
• function (defaultVar) { defaultVar = (defaultVar === undefined) ? false : defaultVar }