CodeQL library for JavaScript/TypeScript
codeql/javascript-all 2.1.2-dev (changelog, source)
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Primitive predicate string::indexOf

Returns the index of the n’th (starting at 0) occurrence of the given string within the receiver, starting at the given 0-based offset. Has no result if the string does not occur in the receiver.

int indexOf(string substringToFind, int n, int startAt)