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Throw error if null or undefined #65

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2 changes: 2 additions & 0 deletions slug.js
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@ function symbols(code) {
}

function slug(string, opts) {
if (string === null || string === undefined)
throw new Error('Slug input must be castable to string')
string = string.toString();
if ('string' === typeof opts)
opts = {replacement:opts};
Expand Down