refactor: replace deprecated String.prototype.substr()
#691
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`.substr()` is deprecated so we replace it with `.slice()` which works similarly but isn't deprecated. See also: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr Signed-off-by: Lam Wei Li <peteriman@mail.com>
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Note: the
engine.io.jsfile is the generated output ofmake engine.io.js, and should not be manually modified.The kind of change this PR does introduce
Current behaviour
Deprecated
String.prototype.substr()is used.New behaviour
String.prototype.slice()is used instead.Other information (e.g. related issues)
N.A.