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Remove implementation frames from stack trace #922

merged 5 commits into from Apr 4, 2017
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@@ -46,14 +46,22 @@ module.exports = function (_chai, util) {
* in environments that support `Error.captureStackTrace`, and only when
* `Chai.config.includeStack` hasn't been set to `false`.
* - `lockSsfi`: This flag controls whether or not the given `ssfi` flag
* should retain its current value, even as assertions are chained off of
* this object. This is usually set to `true` when creating a new assertion
* from within another assertion. It's also temporarily set to `true` before
* an overwritten assertion gets called by the overwriting assertion.
* @param {Mixed} obj target of the assertion
* @param {String} msg (optional) custom error message
* @param {Function} stack (optional) starting point for removing stack frames
* @param {Function} ssfi (optional) starting point for removing stack frames
* @param {Boolean} lockSsfi (optional) whether or not the ssfi flag is locked
* @api private

function Assertion (obj, msg, ssfi) {
function Assertion (obj, msg, ssfi, lockSsfi) {
flag(this, 'ssfi', ssfi || Assertion);
flag(this, 'lockSsfi', lockSsfi);
flag(this, 'object', obj);
flag(this, 'message', msg);