| 1 | function Once(fn) {
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| 2 | var called = false;
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| 3 |
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| 4 | return function() {
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| 5 | if (!called) {
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| 6 | called = true;
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| 7 | return fn.apply(null, arguments);
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| 8 | }
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| 9 | else {
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| 10 | return Once.ALREADY_CALLED;
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| 11 | }
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| 12 | }
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| 13 | }
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| 14 |
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| 15 | Once.ALREADY_CALLED = Object.freeze({});
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| 16 |
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| 17 | module.exports = Once; |
| \ | No newline at end of file |