Preventing closure compiler from renaming specific object keys

[Greg Grothaus]

I have some JavaScript code which essentially is a small static set of strings which I want to determine membership in during execution, ie:

/*

 * @type {Object<string, number>} *

 */

const TheSet = {

  'foo': 0,

  'bar': 0,

  'baz': 0,

}

...

if (TheSet.hasOwnProperty(someExternalVar)) {

  ...

}

If I access TheSet using hasOwnProperty, closure compiler renames away the string keys, they are no longer present in the final compiled file and the code doesn't work. If I access TheSet using array notation:

if (TheSet.hasOwnProperty[someExternalVar] !== undefined) {

  ...

}

Then the compiler preserves the string keys and all is good. Is there a way to prevent closure compiler from doing this particular renaming? Alternatively is there a better formulation of my whole approach to this problem that would have better performance?

Cheers,

-Greg

[Chad Killingsworth]

This seems like a bug: http://closure-compiler-debugger.appspot.com/#input0%3D%250Aconst%2520TheSet%2520%253D%2520%257B%250A%2520%2520'foo'%253A%25200%252C%250A%2520%2520'bar'%253A%25200%252C%250A%2520%2520'baz'%253A%25200%252C%250A%257D%250A%250Aconsole.log(TheSet.hasOwnProperty('foo'))%253B%26input1%26conformanceConfig%26externs%26refasterjs-template%26includeDefaultExterns%3D1%26CHECK_SYMBOLS%3D1%26CHECK_TYPES%3D1%26CLOSURE_PASS%3D1%26COLLAPSE_PROPERTIES%3D1%26COLLAPSE_VARIABLE_DECLARATIONS%3D1%26FOLD_CONSTANTS%3D1%26INLINE_CONSTANTS%3D1%26INLINE_FUNCTIONS%3D1%26INLINE_PROPERTIES%3D1%26INLINE_VARIABLES%3D1%26LANG_IN_IS_ES6%3D1%26MARK_NO_SIDE_EFFECT_CALLS%3D1%26MISSING_PROPERTIES%3D1%26PRESERVE_TYPE_ANNOTATIONS%3D1%26PRETTY_PRINT%3D1%26PROPERTY_RENAMING%3D1%26REMOVE_DEAD_CODE%3D1%26REMOVE_UNUSED_VARIABLES%3D1%26SMART_NAME_REMOVAL%3D1%26TRANSPILE%3D1%26VARIABLE_RENAMING%3D1

Chad Killingsworth

[John Lenz]

Definitely a bug

--

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